Otitis media

Otitis media is inflammation of the middle ear, the air-filled cavity behind the eardrum that contains the ossicles and connects to the throat through the Eustachian tube. It is one of the most common reasons children see a doctor and receive antibiotics, and it is a major cause of temporary hearing loss in early childhood. The condition is usually classified clinically as acute otitis media (AOM) or otitis media with effusion (OME), and the distinction matters because antibiotics are generally beneficial only for AOM, even though fluid is present in both. The entry places the condition within the wider field of infectious disease and inflammation, since it involves both bacterial and viral pathogens and an immune response in a confined space.

The article explains how the condition develops, from Eustachian tube dysfunction and the microbes involved to the immune response, and then covers epidemiology, symptoms, diagnosis, and treatment for each form. It also addresses chronic suppurative disease and complications, prevention through vaccination and risk reduction, antibiotic resistance and stewardship, global burden and access to care, adult presentations, and questions that remain under study.

Definition and clinical classification

Otitis media is inflammation of the middle ear, the air-filled cavity behind the tympanic membrane that connects to the nasopharynx through the Eustachian tube. The term covers several conditions that differ in onset, the presence of infection, and course, so classification is the first step in deciding how to manage a patient. The most basic division is between acute otitis media (AOM) and otitis media with effusion (OME).

AOM is defined by rapid onset of middle-ear inflammation, usually with pain and often fever. The middle-ear space fills with fluid that may be purulent, and the eardrum is typically inflamed and bulging. The condition is often bacterial in origin and frequently follows a viral upper respiratory infection. OME, also called serous or secretory otitis media and "glue ear" in British usage, is the presence of fluid in the middle ear without signs of acute infection. Pain and fever are typically absent, and the main abnormality is the effusion itself, which can be found on examination of the eardrum and on hearing tests.

Several further categories are used in clinical practice. Chronic OME refers to effusion that persists for more than three months, a threshold that marks the point at which the condition is generally considered persistent and hearing assessment becomes more important. Recurrent AOM describes several discrete episodes of acute infection separated by symptom-free intervals; it is commonly defined as three or more episodes in six months, or four or more in a year, although definitions vary between studies. Chronic suppurative otitis media (CSOM) is persistent or recurrent discharge through a perforation of the tympanic membrane, usually lasting more than six weeks. In CSOM the infection is established behind a broken eardrum, which distinguishes it from the closed-eardrum conditions above.

The classification guides treatment because the two principal forms call for different responses. AOM is frequently bacterial and can progress, so it may require antibiotic treatment or, in some cases, a period of close observation with analgesia. OME usually resolves without antibiotics, most often within three months, so the main tasks are to avoid unnecessary drugs and to monitor hearing and development. Accurate categorisation therefore determines whether a clinician prescribes, observes, or refers.

Fluid can also remain after an episode of AOM has resolved. Once the pain and fever have settled, the middle ear may stay full of fluid for weeks as the mucosa recovers, and this residual effusion is a sequel of infection rather than evidence of active infection. For this reason, the presence of fluid alone does not establish that an ear is currently infected, and clinicians interpret effusion in light of the symptoms, the eardrum's appearance, and the time since the acute episode.

Anatomy of the middle ear and Eustachian tube function

Structures of the middle ear

The middle ear is an air-filled space within the temporal bone. It is separated from the external ear canal by the tympanic membrane, the eardrum. This thin membrane has three layers: an outer skin layer, a fibrous middle layer, and an inner mucosal layer. In adults it measures roughly 9–10 mm across. Its upper, looser part is the pars flaccida, and its lower, taut part is the pars tensa. Because the membrane's mobility and shape change with middle-ear pressure, these features are central to clinical examination.

Medial to the membrane lies the tympanic cavity, which contains the three auditory ossicles. The malleus is attached to the tympanic membrane, the incus articulates with it, and the stapes footplate sits in the oval window of the cochlea. Together they form a lever chain that carries sound vibration across the air-filled space and partly offsets the mismatch between airborne sound and cochlear fluid. The cavity is lined by a thin mucosa containing ciliated and secretory cells.

Posteriorly, the tympanic cavity connects through the aditus to the epitympanic recess and the antrum. The antrum opens into the mastoid air cells, a honeycomb of air-containing spaces within the mastoid process of the temporal bone. These cells are lined by mucosa continuous with that of the cavity. The mastoid is poorly aerated at birth, and pneumatization continues through childhood. Because the compartments share a mucosal lining and communicate through narrow passages, inflammation and fluid in one area can readily spread to the others.

Eustachian tube anatomy and function

The Eustachian tube links the middle ear to the nasopharynx. In adults it is about 35–38 mm long. Its lateral two-thirds are cartilaginous, and its medial third is bony. The nasopharyngeal end is normally closed and opens only actively. The tensor veli palatini muscle opens it during swallowing, yawning, and chewing, with the levator veli palatini contributing. Its lining is ciliated respiratory epithelium with goblet cells, similar to that of the nasal airway.

The tube performs three main functions. The first is pressure equalization, which keeps middle-ear pressure close to atmospheric pressure so that the tympanic membrane can vibrate freely. The second is ventilation. Gases in the middle ear are steadily absorbed by the mucosa, and the tube replenishes them from the nasopharyngeal air. The third is drainage. Mucociliary transport moves secretions from the middle ear toward the nasopharynx, where they are cleared by swallowing.

Why young children are more vulnerable

In infants and young children, the tube is shorter and runs more horizontally than in adults. This reduces the gravity-assisted drainage that adults rely on and allows secretions and refluxed material to reach the middle ear more easily. The cartilage of the tube is also more compliant, so the lumen is more prone to collapse. The muscles that open the tube are thought to work less efficiently in infancy. The adenoids are relatively large in young children and sit close to the tubal opening, so their swelling can obstruct the orifice. Together these features make the tube more likely to fail to ventilate and drain, which increases susceptibility to middle-ear disease.

From tubal dysfunction to effusion

When the tube fails to open, the air in the middle ear is gradually absorbed by the mucosa, and the resulting negative pressure draws the tympanic membrane inward. Negative pressure also promotes transudation of fluid from the mucosal capillaries. This early fluid is serous and is initially sterile. Impaired clearance then allows the fluid to persist. Inflammatory swelling narrows the tube and the cavity lumen, ciliary transport slows, and secretions stagnate. The stagnant fluid provides a medium in which bacteria can colonize, and bacterial communities in biofilm form may further reduce clearance. The balance between ventilation, drainage, and local inflammation therefore determines whether the fluid resolves or persists.

Microbiology and viral triggers

Leading bacterial pathogens

Three bacterial species dominate culture-based and molecular studies of acute otitis media (AOM): Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. A pooled meta-analysis places pneumococcus first at about 29%, followed by H. influenzae at about 22% and M. catarrhalis at about 5%. Streptococcus pneumoniae was the most prevalent pathogen, with a pooled proportion of 29.0% (95% CI, 26.3–31.8%), followed by Haemophilus influenzae (22.3%; 95% CI, 19.3–25.6%) and Moraxella catarrhalis (4.6%). The ranking shifts with age, setting, and method. In a large culture series of children under five, about 64% of 12,799 episodes were culture positive; H. influenzae accounted for 48.0% of isolates and S. pneumoniae for 42.9%, while M. catarrhalis accounted for 4.8%. Regional data also vary. A Thai tympanocentesis study found pneumococcus in 23% of samples and H. influenzae in 18%, and most of the H. influenzae isolates were encapsulated, with type b making up most of them (23%) and H. influenzae (18%), Moraxella catarrhalis (6%) or Streptococcus pyogenes (3%). In contrast, a Spanish emergency-department series found H. influenzae as the most frequent isolate, and about a third of episodes yielded no pathogen In 34.9% no pathogens were isolated. Molecular testing raises the apparent share of M. catarrhalis: in a Finnish series of children aged 5 to 42 months, PCR detected it in 47% of middle-ear fluid samples, more than either H. influenzae or pneumococcus According to PCR analysis, M. catarrhalis results were positive in 42 (47%) samples, H. influenzae in 30 (33%), S. pneumoniae in 27 (30%). In adults, pneumococcus and H. influenzae remain the most common bacteria, while M. catarrhalis and group A streptococci are less frequent causes Common bacteria causing AOM in both children and adults are Streptococcus pneumoniae and Haemophilus influenzae. Group A Streptococcus, Staphylococcus aureus, and Moraxella catarrhalis are less frequent causes.

Nontypeable H. influenzae (NTHi) is a common respiratory commensal that also causes middle-ear infection. After the introduction of heptavalent pneumococcal vaccination, pneumococcus and NTHi emerged as the two most frequent bacteria in AOM With the expanded use of 7-valent pneumococcal vaccination, Streptococcus pneumoniae and NT-Hi are the two most common bacteria implicated in AOM. Less common organisms include S. aureus, Pseudomonas aeruginosa, and Alloiococcus otitidis, which PCR detected in about 7% of samples in the Finnish series. Culture remains the reference method, but it can miss organisms whose viability has declined during transport, and PCR is more sensitive for bacterial DNA bacterial culture can be affected by reduced viability or suboptimal growth of bacteria. PCR detects bacterial DNA from samples with greater sensitivity than culture.. Routine cultures are generally not obtained in uncomplicated cases, because most episodes are diagnosed and treated on clinical grounds, and collecting middle-ear fluid requires an invasive procedure, usually tympanocentesis.

Viral triggers

Viral infection is the usual precursor. Most new episodes of otitis media are temporally associated with acute viral respiratory tract illnesses, and the symptoms of the viral illness typically come first. In a 1990 prospective study of 363 children, viruses were identified in 42% of patients, with rhinovirus and respiratory syncytial virus (RSV) the most frequent Respiratory viruses were detected using virus isolation and virus antigen detection in nasopharyngeal specimens of 42% of the patients at the time of diagnosis. Rhinovirus (24%) and respiratory syncytial virus (13%) were the two most common viruses detected.. Other viruses commonly implicated include parainfluenza virus, influenza virus, adenovirus, and coronaviruses. The mechanism involves the Eustachian tube. Viral infection reduces mucociliary clearance, alters goblet-cell mucus production, and increases inflammatory mediator expression, which together impair the tube's protective functions for a limited period. This transient impairment allows commensal nasopharyngeal bacteria to reach the middle ear Infection by upper respiratory tract viruses results in dysregulation of normal Eustachian tube (ET) function via decreased mucociliary action, altered mucus secretion by goblet cells and increased expression of inflammatory mediators of the host. The resultant transient reduction in protective functions of the ET provides the opportunity for commensal bacteria of the NP to.

Viruses also reach the middle ear directly. RSV was recovered from middle-ear fluid in 74% of children with viral illness in one series the virus was detected in the middle-ear fluid of 74 percent of the children infected by this virus. Pneumococcus was cultured far more often in fluid containing influenza virus than in fluid containing RSV or parainfluenza pneumoniae was cultured significantly more often in middle-ear fluid containing influenzaviruses (100 percent) than in those containing respiratory syncytial virus (36 percent) or parainfluenza viruses (10 percent). Virus-only infection of the middle ear is uncommon, and co-infection with bacteria is more typical. Fifty-five (6%) of these ears had viruses as the sole pathogen without bacteria. In 85 (9%) ears, both virus and bacteria were detected. The two infections also differ in their clinical course. Children with virus-positive and virus-negative AOM showed similar tympanic membrane findings and outcomes, and most responded to antibiotics No significant differences were found in the appearance of the tympanic membrane and outcome of illness between virus-negative and virus-positive patients with acute otitis. Most patients respond well to antimicrobial therapy despite the coexisting viral infection.

Polymicrobial infection and biofilms

Mixed infections are the rule rather than the exception. Epidemiological data demonstrates most cases of otitis media are polymicrobial, which may have significant impact on antibiotic resistance. Species interact in ways that affect persistence. In an experimental model, nontypeable H. influenzae and pneumococcus together persisted in the middle ear and produced polymicrobial disease During coinfection with nontypeable H. influenzae, both species persisted for one week and induced polymicrobial otitis media.. In vitro work also suggests that NTHi can shield pneumococci within mixed biofilms from amoxicillin nontypeable H. influenzae conferred passive protection from killing by amoxicillin upon S. pneumoniae from within polymicrobial biofilms in vitro.. Similar stabilizing effects have been described for M. catarrhalis, which helped NTHi survive in dual-species biofilms with pneumococcus M. catarrhalis promotes a favorable environment for stable polymicrobial biofilms by enhancing the survival of NTHi in the presence of S. pneumoniae..

Biofilms are central to chronic and recurrent disease. A biofilm is a community of microorganisms attached to a surface and enclosed in a self-produced matrix, and that matrix helps shield bacteria from host immunity and antibiotics A biofilm is a community of microorganisms adhering to a surface and enclosed in a self-produced extracellular matrix (ECM). This structure protects against external aggression such as the host immune system and antibiotics treatment. In the middle ear, NTHi biofilms have been linked to persistence, and bacteria survived within neutrophil extracellular traps in the chinchilla model. The clinical link is less settled. NTHi is frequently associated with treatment failure and recurrence Non-typable Haemophilus influenzae (NT-Hi) infection is frequently associated with acute otitis media (AOM) treatment failure, recurrence or chronic otitis media., yet one clinical study found no association between in vitro biofilm production and treatment failure or recurrence We found no association of biofilm production and AOM treatment failure or recurrence.. Another study reported that isolates from children whose AOM did not improve on amoxicillin produced more biofilm than isolates from children who improved The level of biofilm formation of NTHi isolated from AOM cases who was not improved by amoxicillin (AMPC) was significantly higher than that of NTHi isolated from AOM cases who was improved by AMPC.

Pathogenesis: from tubal dysfunction to middle-ear inflammation

From viral infection to effusion

Most episodes start in the upper airway. A viral infection of the nose and nasopharynx swells the mucosa, and that swelling extends into the Eustachian tube, which is lined by the same continuous epithelium. At rest the tube stays almost shut, and it opens only briefly when the tensor veli palatini muscle contracts during swallowing, yawning, or crying (With the muscle at rest, the tube is almost always closed.). Tubal opening typically lasts less than one-half second. When inflammation keeps the lumen narrowed, ventilation fails. The gas already in the cavity is gradually absorbed by the lining, so pressure falls and fluid leaks out of the vessels. This is the transudate that becomes an effusion, and transudation of sterile middle ear effusion into the tympanum can result when ventilation is inadequate.

Bacteria usually arrive later, by the same route. Bacteria infecting the middle ear come from the nasopharynx via the eustachian tube. Their attachment to pharyngeal and tubal epithelial cells makes colonization easier (This colonization is facilitated by bacterial adherence on the pharyngeal and the eustachian tube cells.). The tube's intermittent opening also allows secretions to be drawn back into the cavity, which helps explain why persistent effusion and recurrent acute disease can coexist (aspiration of nasopharyngeal secretions might occur, producing the clinical condition in which persistent effusion and recurrent acute OM occur together.). Effusions were once assumed to be sterile, but bacteria are recovered from many effusions in OME, which is why the bacterial contribution is now considered substantial.

Innate response

The innate immune system responds within hours. Leukocytes, macrophages and mast cells infiltrate the middle-ear mucosa (Otitis media is characterized by inflammation of the middle ear with an infiltration of the subperiosteal space byleukocytes, macrophages and mast cells.). Neutrophils are recruited in large numbers and, together with macrophages, phagocytose bacteria and cell debris. The inflammatory cascade also releases cytokines and lipid mediators, and the effusion accumulates eicosanoids, cytokines and histamine (The effusion contains great amounts of inflammatory mediators (eicosanoids, cytokines, histamine).). These signals increase vascular permeability and mucosal swelling. In acute disease they produce a purulent exudate rich in dead neutrophils. In non-suppurative disease, mediators can stimulate goblet-cell secretion. One proposed mechanism is that releasing of inflammatory mediators will cause secretion of a mucin-rich effusion by up-regulating mucin genes. This would induce prolonged stimulation of the inflammatory response and poor mucociliary clearance leading to persistence of the middle ear fluid.

The innate response is not always self-limiting. This localised inflammatory response can persist even after pathogens are cleared from the middle ear, eustachian tubes and, in the case of respiratory viruses, even the nasal compartment. Residual inflammation can therefore keep fluid in place after the infecting organism has gone, which is one reason effusion alone does not prove active infection.

Adaptive response and the limits of infant immunity

Antibodies and memory lymphocytes contribute to recovery. Specific antibodies to bacterial surface antigens help opsonize pathogens for phagocytosis, and prior exposure allows faster responses on re-infection. Children with repeated infections can build serotype-specific protection, which partly explains why infections in older children are less frequent. Infants have limited protection because their antibody responses are immature. Responses to polysaccharide antigens, which many bacterial capsules contain, are weak before about two years of age, and affinity maturation and memory take years to develop. The adaptive response therefore arrives late in the disease course, when much of the damage has already occurred in very young children.

Prolonged inflammation and tissue damage

When inflammation and effusion persist, the middle-ear mucosa and bony structures change. Sustained pressure on the tympanic membrane, together with mediator-driven tissue injury, can cause retraction, thinning and eventually perforation. Repeated inflammatory cycles can also thicken and remodel the mucosa. Many OME are still intractable, pversistent, and develop into chronic secretory otitis media, leading to sequelae like tympanic chamber adhesions, tympanosclerosis, and middle ear cholesterol granuloma. The susceptibility of some children appears to lie in the response itself. Children prone to OM may experience an over exuberant inflammatory response that underlies the development of chronic forms of OM and their sequelae, including hearing impairment. The consequences of these changes, including perforation and cholesteatoma, are covered in the sections on chronic suppurative disease and complications.

Epidemiology and risk factors

Otitis media is one of the most common childhood conditions in the world, although its frequency depends heavily on how it is defined and counted. In a large US electronic health record cohort of more than 900,000 children, roughly 20% had at least one recorded episode by age one and about 40% by age three. Broader reviews of the literature put the figure for at least one episode before age three at around 80%, with the median age at first onset between 6 and 12 months. Most children also have a period of middle-ear effusion (OME) before school age, often without symptoms and frequently found during routine examination. Incidence is highest in infancy and toddlerhood and falls with age. Earlier first episodes are linked to a higher later risk of recurrent disease and chronic effusion.

These figures need careful reading. A meta-analysis of studies from India pooled prevalence at about 3.8% for chronic suppurative otitis media, 2.7% for OME and 0.55% for acute suppurative otitis media, yet individual school-based surveys in the same review ranged from under 5% to above 25%. The age range sampled, whether diagnosis relied on symptoms, otoscopy, tympanometry or parental report, and whether single episodes or recurrent patterns were counted all shift the result. Cross-study comparisons therefore often reflect methodology as much as true differences in disease burden. Global estimates from the Global Burden of Disease programme show a different pattern: the number of incident childhood cases rose from about 256 million in 1990 to about 297 million in 2021, while the age-standardized burden in disability-adjusted life years declined.

Several nonmodifiable factors shape individual risk. Age is the strongest, and the early first episode is the key marker of later trouble. Sex differences appear in some cohorts, with boys more often affected in the first years of life in several datasets, although findings are not uniform. Ethnicity and socioeconomic status are associated with incidence in US data: the same cohort found higher rates among non-Hispanic Black and Hispanic children, as well as among children with public insurance and higher family income. The higher-income association probably reflects differences in how often children are seen and recorded rather than biological risk, though this interpretation is not fully established. Prematurity, low birth weight and short gestation are also linked to higher risk. Host factors include craniofacial anomalies, particularly cleft palate, which carries one of the highest risks, and abnormal ciliary function. Down syndrome, immunodeficiency and a family history of recurrent infection increase susceptibility. Allergic rhinitis and adenoid hypertrophy are associated with higher risk in some case-control studies, although these studies are small and their odds ratios are unstable.

Modifiable factors center on exposures that increase the transmission of upper respiratory pathogens and the chance of Eustachian tube dysfunction. Attendance at group childcare and exposure to siblings increase contact with respiratory viruses and bacteria, and crowding and poor hygiene have been reported as risks in low- and middle-income settings. Passive tobacco smoke is consistently linked to higher risk, as are fine particulate matter (PM2.5), nitrogen dioxide and ozone, with children aged under one year and those aged three to five appearing most susceptible. Bottle feeding and pacifier use, particularly lying supine, have been associated with infection in case-control data. Incidence also follows seasonal patterns, rising in the colder months and in late winter and spring, in step with circulation of respiratory viruses.

Socioeconomic setting exerts a strong influence on childhood burden. Analyses across Socio-Demographic Index levels find that childhood burden falls as socioeconomic development increases, while the differences largely disappear after age 20, which suggests that environmental and healthcare factors weigh most heavily in childhood. Regionally, the highest age-standardized prevalence has been reported in eastern and western sub-Saharan Africa and South Asia, and the lowest in central Europe, East Asia and high-income Asia-Pacific countries. Declines in incidence after the introduction of pneumococcal conjugate vaccines and during the COVID-19 pandemic show that exposure patterns, not only biology, shape population rates.

Signs, symptoms, and presentation by age

Older children and adults

In older children, acute otitis media usually begins with the usual initial symptom is otalgia (earache), often with hearing loss. Older children may also describe a feeling of fullness, pressure, or decreased hearing, with or without fever. Fever is common but usually mild, with approximately two-thirds of affected patients also present with fever, typically low-grade. Acute infection in adults is uncommon. When it occurs, reported features include ear pain or pressure, hearing changes or muffled hearing, a feeling of fullness in the ear, ear drainage, fever, and dizziness or balance concerns.

Young children and preverbal infants

Young children more often show systemic features. Gastrointestinal symptoms such as vomiting and diarrhea accompany the ear complaint, especially in the youngest patients. In infants, the picture is frequently behavioural rather than local: infants may simply be cranky or have difficulty feeding or sleeping. Clinicians are also advised to look for tugging or pulling at the ear(s), fussiness and crying, disturbed sleep, and reduced appetite, since most ear infections happen to children before they've learned how to talk. These clues carry limited weight on their own. Reviews note that none is sensitive or specific, and these symptoms are not helpful in distinguishing AOM from a respiratory tract infection. Because a feverish infant may show no localizing sign at all, the ear can be overlooked, and the diagnosis rests on otoscopy, which is discussed elsewhere in this entry.

Otitis media with effusion

Effusion without acute infection is typically quiet. Often asymptomatic is the usual description, and a sensation of pressure may be present, sometimes with mild pain. The clinically important feature is hearing impairment, which is the most frequently reported symptom of OME by patients, families, or caregivers, although it is easily missed in very young children. A child may be noticed only through behaviour. Typical reports include mishearing, difficulty with communication in a group, listening to the TV at excessively high volumes or needing instructions to be repeated. Because the loss is usually mild and tends to fluctuate, parents and teachers may first see communication difficulties, delayed language development, academic struggles, behavioral or sleep disturbances, social withdrawal, and reduced concentration. In some cases the first clue is detected by the newborn hearing screening test. Significant hearing loss can therefore go unrecognized for long periods, with consequences for speech and language development that are discussed in the sequelae section.

Otorrhea after tympanic perforation

Once the tympanic membrane has ruptured, the clinical picture shifts toward discharge from the ear canal. In chronic suppurative otitis media (CSOM), symptoms include painless otorrhea with conductive hearing loss. Pain is uncommon unless an associated osteitis of the temporal bone occurs. The discharge itself is often distinctive: infections often are caused by gram-negative bacilli or Staphylococcus aureus, resulting in painless, purulent, sometimes foul-smelling otorrhea. Sources differ on the time threshold. One reference describes discharge over two to six weeks through a perforation of the tympanic membrane, whereas another defines the chronic form as drainage lasting more than six weeks.

Otorrhea changes the diagnostic picture in two directions. In a patient with a perforated membrane, discharge points toward middle-ear disease. In a patient with an intact membrane, the source should be sought elsewhere, because the absence of perforation should prompt consideration of external ear pathology. The presence of a tube or perforation also does not settle the question on its own, since otorrhea is a common sequela in children with tympanostomy tubes, although otorrhea does not necessarily indicate CSOM. Discharge accompanied by red-flag features requires urgent review. These include otalgia, signs of systemic illness, e.g., fever, focal neurologic signs, altered mental status, headache, clinical features of mastoiditis, and immunocompromise.

Diagnosis: otoscopy, pneumatic otoscopy, and audiometry

Clinical criteria for acute otitis media

Diagnosis of acute otitis media (AOM) rests mainly on what the examiner sees in the ear canal, because symptoms correlate poorly with the middle-ear findings. The most specific diagnostic feature of AOM is bulging of the tympanic membrane, according to the 2013 AAP guideline. Under that guideline, clinicians should diagnose AOM in children who present with moderate to severe bulging of the tympanic membrane (TM) or new onset of otorrhea not due to acute otitis externa. A milder bulge is accepted only when it is accompanied by other evidence of inflammation: mild bulging of the TM and recent (less than 48 hours) onset of ear pain (holding, tugging, rubbing of the ear in a nonverbal child) or intense erythema of the TM.

Redness alone is not treated as sufficient. Other signs of acute inflammation, such as bulging, loss of landmarks, a change in colour, or reduced membrane mobility, carry more weight in the diagnosis. An unclear light reflex, thickening of the TM, bullous formations, a cloudy membrane, and perforation are regarded as supportive findings. The stricter criteria were introduced to reduce unnecessary antibiotic prescribing, and they also exclude children who have no effusion at all. AOM should not be diagnosed when pneumatic otoscopy and/or tympanometry do not show middle ear effusion.

Pneumatic otoscopy

Pneumatic otoscopy is the central examination for both AOM and otitis media with effusion (OME). Pneumatic otoscopy is the primary tool for diagnosing middle ear effusion in acute otitis media or otitis media with effusion. The technique depends on the mobility of the membrane. A normal eardrum moves about 1 mm inward and outward when air pressure in the canal is changed. Reduced or absent mobility of the tympanic membrane also suggests the presence of fluid in the middle ear. The 2016 AAO-HNS guideline makes the same point, noting that reduced tympanic membrane mobility correlates most closely with the presence of fluid in the middle ear. Pneumatic examination also reduces error: it improves diagnostic accuracy by reducing false-negative findings from effusions without obvious air bubbles or an air-fluid level, and false-positive findings from surface changes of the membrane without effusion.

Otoscopic appearance alone has limits. Behind an intact membrane, OME typically shows visible fluid (often yellowish, but sometimes clear), but this is not always visible. Follow-up examinations are also informative: in one prospective study, an examination 10-14 days or one month after diagnosis was 75% accurate in predicting effusion after three months.

Tympanometry and audiometry

Tympanometry is an objective complement to pneumatic otoscopy. It provides quantitative information about the presence of fluid in the middle ear, mobility of the middle ear system, and ear canal volume. Guidance treats it as optional in most settings: tympanometry is an optional tool that can be used to confirm suspected otitis media with effusion. Used together with otoscopy, it helps interpretation, because many abnormalities of the eardrum and ear canal that might cause an abnormal tracing can be visualized during the otoscopic examination.

Audiometry assesses the functional consequences. OME is considered the most common cause of hearing impairment among children, and diagnosis is mainly based on pneumatic otoscopy, pure-tone audiometry, and tympanometry. Hearing testing is therefore central to deciding whether an effusion needing further action. Referral is indicated when hearing is affected or when screening is abnormal; for example, the AAO-HNS guideline advises that parents of infants with failed newborn screening due to suspected OME should follow up with testing so that sensorineural hearing loss is not missed.

Differential diagnosis

Several conditions can mimic AOM or OME. The list of differentials includes OME, eczema, contact dermatitis, otitis externa, viral upper respiratory infection, and acute sinusitis. Otitis externa is distinguished from AOM by the middle-ear examination: in otitis externa, pneumatic otoscopy shows normal membrane motion, and tympanometry shows a normal peaked tracing. Myringitis, an inflammation of the membrane itself, may be recognised by an inflamed tympanic membrane, potentially with bullae, severe pain, and no edema of the ear canal. Cerumen impaction, foreign bodies, tympanic perforation, and tumours also need to be considered when the membrane cannot be properly viewed.

Computer-based image analysis

Automated analysis of otoscopic images is an emerging adjunct. Earlier computer-based studies were limited to the evaluation of otitis media while excluding other significant ear pathologies, which restricted their clinical use. A more recent deep-learning study used 10,544 labelled otoendoscopic images and reported a mean accuracy of 93·73% across six categories. Accuracy was lower for externa and myringitis, at 77·91% with 89·33% sensitivity and 99·02% specificity. Such results depend on the composition of training data and on the examiner's reference standard, and they require independent validation before routine use.

Management of acute otitis media

Treatment of AOM starts with symptom control rather than antibiotics. Guidelines recommend that every child with AOM receive adequate pain relief, and analgesia matters most at night, when disrupted sleep is among the most distressing features of the illness. Clinicians can therefore present analgesia as the core of care for all children, whatever antibiotic decision follows.

Antibiotics can be deferred in some children. For those aged two years or older with mild symptoms, the AAFP review states that prescribing can be postponed. The AAP guideline suggests observation for 48 to 72 hours in lower-risk children, and this approach depends on the caregiver's reliability and a clear plan for review. The usual durations differ by age and severity. Children under two, or those with severe signs, typically receive a 10-day course, whereas older children with non-severe disease may need only 5 to 7 days.

When antibiotics are indicated, high-dose amoxicillin at 80 to 90 mg/kg/day in two divided doses is first-line treatment. The higher dose lifts middle-ear concentrations above the minimum inhibitory concentration of intermediately penicillin-resistant pneumococci for a longer part of the dosing interval. Amoxicillin-clavulanate is preferred when a child has had amoxicillin within the previous 30 days or has purulent conjunctivitis, because the common pathogens in these settings often produce β-lactamase. For children with a penicillin allergy, the AAFP review recommends cefdinir or azithromycin as first-line options, reflecting the risk of cephalosporin allergy. Stewardship guidance also notes that fewer than 1% of people who report a penicillin allergy are truly allergic, so careful allergy history can prevent unnecessary use of broader agents.

Failure of initial therapy is generally defined as persistent or worsening symptoms and signs after about 72 hours. The AAFP review advises reexamining children who have not improved after 48 to 72 hours and switching to a second-line agent such as amoxicillin-clavulanate. Where that also fails, options include ceftriaxone for children without a cephalosporin allergy, and a working group has suggested tympanocentesis to identify the organism and its susceptibility. Because β-lactamase-producing H. influenzae and M. catarrhalis are not reliably covered by high-dose amoxicillin alone, resistance is an important differential when treatment fails.

The evidence for antibiotic benefit is modest. The 2023 Cochrane review found that antibiotics do not reduce pain at 24 hours, but they lower the proportion of children with pain at two to three days, with a number needed to treat of about 20. The same review reports that antibiotics slightly reduce tympanic perforations and abnormal tympanometry at follow-up. Spontaneous resolution occurs in most children, and the earlier Cochrane analysis reported adverse effects, such as vomiting, diarrhoea or rash, in roughly one child in 14. Benefit appears greatest in children under two with bilateral disease, and in trials, analgesic use was similar in treated and placebo groups.

Management of otitis media with effusion and chronic OME

Watchful waiting and monitoring

For children with OME who are not at increased risk of speech, language, or learning problems, the AAO-HNSF guideline advises observation for three months, counted from the onset of effusion when that is known, or from diagnosis when it is not. In children with OME who are not at risk, clinicians should practice watchful waiting for three months from the date of effusion onset (if known) or three months from the date of diagnosis (if onset is unknown). The rationale is that spontaneous clearance is common. OME is often self-limited when caused by an upper respiratory tract infection or following acute otitis media (AOM). The three-month window also helps separate these cases from effusions that are unlikely to clear without intervention. A three-month observation period can distinguish self-limited OME from OME that is unlikely to resolve spontaneously.

During observation, clinicians reassess children with chronic OME at intervals of roughly three to six months. Reassessment continues until the fluid clears, a significant hearing loss is identified, or a structural abnormality of the eardrum or middle ear is suspected. Clinicians should reevaluate, at 3- to 6-month intervals, children with chronic OME until effusion is no longer present, significant hearing loss is identified, or structural abnormalities of the eardrum or middle ear are suspected. Interval visits typically rely on pneumatic otoscopy, tympanometry or both. An age-appropriate hearing test is advised once effusion has persisted for at least three months, or earlier in a child who is at risk. Educational and behavioural strategies to lessen the effects of hearing loss are also recommended during this period (advice on educational and behavioural strategies to minimise the effects of the hearing loss should be offered).

Medical treatment

Drugs are not recommended to clear effusion. Clinicians should recommend against using intranasal steroids or systemic steroids for treating OME. Other agents, including oral and nasal corticosteroids, antibiotics, mucolytics or nasal decongestants, are likewise discouraged because they show little effect or cause side effects. Complementary and alternative medicine is not recommended for OME either. Autoinflation of the Eustachian tube may be used during surveillance and may offer clinical benefit, although trial results on autoinflation are divergent although suggestive of clinical effect in the short-term.

Surgical ventilation with tympanostomy tubes

Tympanostomy tubes are indicated when effusion persists and causes hearing loss. The AAO-HNSF guideline suggests that tympanostomy tubes should be offered to infants six months or older with hearing loss and bilateral OME for three or more months. Persistence can be judged by a flat tympanogram or by fluid lasting beyond three months. Tympanostomy tube insertion may be offered to at-risk children with unilateral or bilateral OME that is unlikely to resolve quickly, as reflected by a type B (flat) tympanogram or persistence of effusion for more than 3 months.

The benefits are time-limited. Tympanostomy tubes improve hearing at 1 to 3 months compared with watchful waiting, with no evidence of benefit by 12 to 24 months. Prolonged effusion also carries a structural cost, since a longer duration of effusion increases the risk of structural damage to the membrane. For that reason, the case for surgery strengthens if the eardrum appears to be affected. The UK NICE guideline sets a more specific hearing threshold. Children with persistent bilateral OME documented over a period of 3 months with a hearing level in the better ear of 25–30 dBHL or worse averaged at 0.5, 1, 2 and 4 kHz (or equivalent dBA where dBHL not available) should be considered for surgical intervention. In children with cleft palate, ventilation tubes are placed at palate closure, but only after careful otological and audiological assessment.

Adenoidectomy, hearing aids, and speech and language support

Guidance on adenoidectomy differs between jurisdictions. The 2016 AAO-HNS guideline states that adenoidectomy should not be performed unless there is a distinct indication (e.g., nasal obstruction, chronic adenoiditis) other than OME in children under four, while in older children tympanostomy tubes, adenoidectomy, or both may be recommended. The 2023 NICE guideline takes a different position, advising clinicians to consider adjuvant adenoidectomy unless assessment indicates an abnormality with the palate.

Where hearing loss persists and surgery is not suitable, amplification is an option. Hearing aids should be offered to children with persistent bilateral OME and hearing loss as an alternative to surgical intervention where surgery is contraindicated or not acceptable. More recent NICE recommendations also consider air conduction hearing aids or bone conduction devices for children with OME-related hearing loss. Earlier US guidance, from 2004, advised that children at increased developmental risk receive speech and language therapy concurrent with managing OME, (2) hearing aids or other amplification device for hearing loss independent of OME, (3) insertion of tympanostomy tube, and (4) hearing testing after resolution of OME to document improvement.

Referral to otolaryngology

Referral is the main route to specialist care. In newborns with a failed hearing screen and persistent hearing loss, referral to an otolaryngologist is recommended. Because timing affects language outcomes, the guideline also notes that intervention before six months of age can reduce the effects of hearing loss on speech and language development. Children at increased risk are assessed more promptly than other children with OME, and their evaluation extends to hearing, speech, language, and the need for intervention.

Chronic suppurative otitis media and tympanic perforation

Definition and causes

Chronic suppurative otitis media (CSOM) is defined by drainage through a perforated eardrum that persists. CSOM occurs when perforation of the tympanic membrane is associated with severe or persistent inflammation in the middle ear, leading to hearing loss and recurrent or persistent ear discharge (otorrhoea). Definitions differ on duration: some sources set the threshold at six weeks, while others use more than three months. There is an absence of consensus on the definition of CSOM, which complicates efforts for prevention, treatment, and monitoring.

Most cases begin as a complication of earlier infection. Chronic suppurative otitis media usually begins as a complication of persistent AOM with perforation in childhood. Other routes include eustachian tube blockage, cholesteatoma, and trauma, including chemical burns, or blast injuries. In high-income settings, previous insertion of tympanostomy tubes is now probably the single most important etiologic factor. In lower-resource settings, frequent upper respiratory tract infections and poor socioeconomic conditions (e.g., overcrowded housing, poor hygiene and nutrition) are often associated with the development of chronic suppurative otitis media. Persistent disease is often linked to sequestered foci of bacterial infection or biofilm within the mastoid or middle ear, cholesteatoma, or repeated contamination of the middle ear through a tympanic membrane perforation or via the eustachian tube, which explains why some ears fail to settle with drops alone.

Microbiology and medical management

The organisms most often isolated differ from those of acute infection. Chronic otorrhea is classically associated with Pseudomonas aeruginosa, Staphylococcus aureus, and Klebsiella spp. The mix varies by region, and the microbiology and antibiotic resistance of CSOM varies based on local factors, including health care access, comorbidities, and antibiotic prescribing practices. Because the canal can contaminate specimens, care should be taken to clear the external auditory canal from debris before obtaining a specimen.

First-line care combines cleaning with topical treatment. Aural toilet, the removal of debris and discharge from the canal, is often considered as first-line therapy together with topical agents. Topical antibiotics are preferred over antiseptics: in children with chronic suppurative otitis media, topical antibiotics may improve symptoms compared with antiseptics. Fluoroquinolone drops such as ciprofloxacin or ofloxacin are used for local therapy. Oral antibiotics may be utilized if initial therapy fails, but systemic treatment is reserved for specific circumstances rather than routine use. Antibiotic-resistant organisms and comorbidities such as HIV infection are associated with poorer responses, so laboratory guided early treatment is recommended in some settings.

Surgical options

When drainage does not resolve, surgery is considered. Tympanoplasty repairs the perforation: a repair of a perforated eardrum, usually with a temporalis fascia graft. The graft is placed beneath the remaining membrane, and approximately 90–95% of patients who undergo a tympanoplasty will obtain complete closure of the perforation. Where infection extends into the mastoid, the operation is often combined with mastoidectomy, which removes diseased tissue from the mastoid air cells and helps improve aeration of the middle ear space. The evidence for adding mastoidectomy to uncomplicated repairs is weak: a review found no additional benefit to performing mastoidectomy with tympanoplasty for uncomplicated tympanic membrane perforations. Its role in more complicated disease remains uncertain, since there is insufficient evidence to make a recommendation for this population.

Cholesteatoma

Cholesteatoma is a major reason for surgery in CSOM. It arises when the inward growth of the squamous epithelium of the tympanic membrane into the middle ear occurs, producing a sac of keratin-filled debris. It enlarges over time and erodes adjacent bone. Cholesteatoma can erode bone, including the three bones of hearing, which may cause infection to spread to the inner ear or brain. Of ossicles, the incus is most often affected: in one series of 166 operated patients, total (55.4%) or partial (30.7%) erosion of the incus was the most common pathology. Because the disease cannot be controlled medically, the only effective treatment is complete surgical removal, but the recurrence rate is relatively high. Surgery often requires removing bone to reach the full extent of the disease, and it is often necessary to remove one or more of the little bones of hearing from the middle ear (the ossicles) which may result in reduction in hearing.

Complications and long-term sequelae

Suppurative complications

Complications of otitis media are uncommon, but the serious ones are the reason clinicians keep close watch on the ear. A large US emergency-department dataset recorded a complication in roughly 0.26% of AOM cases, with mastoiditis, labyrinthitis, and facial palsy the most frequently documented intratemporal events. In a large US-amerikanischen Notaufnahmedatenbank trat nur bei etwa 0,26 % der AOM-Fälle eine Komplikation auf. A Cochrane review found that children given antibiotics and those given placebo had similarly low complication rates, which suggests that antibiotics mainly reduce the risk of spread that is already in progress rather than preventing complications in general (A Cochrane review, however, found that antibiotic- and placebo-treated children had similar and very low rates of complications.).

Mastoiditis is the best-studied suppurative complication. Infection moves from the middle ear into the mastoid air cells, and swelling or granulation tissue that seals the aditus ad antrum prevents pus from draining, so an abscess forms within the temporal bone. Acute mastoiditis remains the most common complication of acute otitis media, affecting one in 400 cases (0.24%). Infection can then erode bone and track beneath the periosteum, producing a subperiosteal collection (Bezold's abscess in older descriptions) and, rarely, spread to the petrous bone or inner ear.

Facial nerve palsy is thought to arise when infection crosses into the facial nerve sheath, causing edema and ischaemic injury to the nerve. Before antibiotics it was considerably more frequent, with estimates of 0.5–0.7 % of middle ear inflammation cases, whereas current estimates are far lower. In most AOM-related cases the prognosis is good once the infection is controlled. In rare cases, bacterial middle ear infection spreads locally, resulting in acute mastoiditis, petrositis, or labyrinthitis.

Recognition can be delayed. Persistent otorrhea during treatment may indicate treatment failure or a coexisting complication, and in some children mastoiditis is silent on examination. Case reports describe facial palsy in children whose mastoiditis was identified only on brain imaging performed after the palsy had appeared.

Intracranial spread and warning signs

Intracranial extension is rare but dangerous. Intracranial spread is extremely rare; it usually causes meningitis. Brain abscess, subdural empyema, epidural abscess, lateral sinus thrombosis, or otitic hydrocephalus may occur. Meningitis involves the meninges and the cerebrospinal fluid and is the most frequent intracranial form. Even with imaging, antibiotic therapy and microsurgery, the death rate in intracranial otogenic complications of acute coalescent mastoiditis is reported at about 10%.

Warning signs that call for urgent assessment include severe earache or headache, vertigo, chills, and high fever. Severe headache, confusion, or focal neurologic signs may occur with intracranial spread of infection. Sepsis together with postauricular swelling is another reason to admit a child. On examination, loss of the sharp angle between the ear and the mastoid, and a pinna displaced downward and forward with boggy swelling over the mastoid, suggest mastoiditis.

Conductive hearing loss and development

Effusion and tympanic damage both produce conductive hearing loss, which is usually modest but can be persistent or fluctuating. There may be a persistent or fluctuating conductive hearing loss (loss of about 25 dB). Reference summaries also note that about half of children with chronic suppurative disease have mild to moderate conductive loss.

Because the loss is intermittent, it can be difficult to detect. Reduced auditory input during early childhood may affect the acquisition of speech and language, attention, and classroom performance. Disorders of speech, language, and cognitive abilities may also occur, though the strength of the causal link between early effusion and later outcomes remains debated, and this is discussed elsewhere in the article.

Permanent sequelae

Persistent inflammation can leave lasting structural changes. Atelectasis, meaning a collapsed or thinned tympanic membrane, and retraction pockets, in which the membrane is drawn inward toward the middle ear, are the common forms. Retraction pockets are of particular concern because they can trap keratin and debris and may progress to more invasive disease. Perforation is another permanent outcome in some children. Many perforations heal on their own, and in one series the perforation spontaneously closed in 94 per cent of the patients within one month. Those that do not close may persist and allow recurrent infection. A central perforation can sustain chronic infection of the middle ear and mastoid cavity, and such cases may require surgical repair.

Prevention, vaccination, and risk reduction

Pneumococcal conjugate vaccines

Pneumococcal conjugate vaccines were designed mainly against invasive disease such as meningitis and bacteremia, so their value against mucosal infection of the middle ear was uncertain from the start. Pre-licensing studies suggested that the vaccine could prevent at most about 10% of AOM episodes in vaccinated children. The 2001 efficacy trial of the heptavalent vaccine in infants found a more specific pattern. Culture-confirmed pneumococcal episodes fell by 34%, and episodes caused by vaccine serotypes fell by 57%, but episodes due to other serotypes rose by 33%, and all-cause AOM showed no significant reduction. Benefit therefore depended on which serotype caused the infection. After PCV7 was introduced more widely, the reduction in the overall AOM burden was greater than the pre-licensure studies had indicated, even though serotype replacement in the nasopharynx was almost complete. Persistent non-typeable Haemophilus influenzae limits what conjugate vaccines can achieve, because it remains a major cause of disease that these vaccines do not cover.

Influenza vaccination

Influenza infection is a recognized trigger of Eustachian tube dysfunction, which is why vaccination was tested as a means of preventing AOM. Early trials in day-care children reported reductions, but the evidence in infants is weaker. A Cochrane review of 11 trials involving 17,123 children aged 6 months to 6 years found that vaccination produced a small reduction in at least one episode of AOM over at least six months of follow-up, with a confidence interval that included no effect. Vaccinated children received fewer antibiotic courses, but vaccination was also associated with a small rise in fever. The reduced efficacy in infants is attributed to the broad range of respiratory viruses that cause AOM and to the weaker immune response of the youngest age group. For this reason, the reviewers judged that the main justification for influenza vaccination lies in preventing influenza itself, not in preventing otitis media.

Behavioral and environmental measures

Several everyday measures are commonly recommended to lower the risk of AOM, especially in infants. Breastfeeding, avoidance of tobacco smoke in the home and car, feeding in an upright position to reduce reflux of milk into the Eustachian tube, and attention to hand hygiene in group childcare settings are the main examples. Limiting exposure to large numbers of children in childcare, where respiratory viruses circulate most easily, also reduces transmission. The strength of evidence for each measure varies, and most are supported by observational data rather than large randomized trials.

Changes in the pathogen mix and resistance

Vaccination has changed the bacterial population in the middle ear as well as its size. Because vaccine-type pneumococci are reduced, non-vaccine serotypes take their place, and this serotype replacement has been documented for IPD caused by non-PCV7 types, which has increased in some high risk groups and regions, particularly associated with serotypes 19A, 6A, and 33F. Vaccine formulations have been revised in response. Resistance trends follow the same pattern, since the most resistant vaccine-type pneumococci are removed first. Reduced antibiotic exposure also lowers selective pressure, and PCVs may also reduce AMR indirectly by decreasing the frequency of infections for which antibiotics are commonly prescribed. Surveillance continues to show that non-vaccine serotype replacement and residual resistant disease continue to shape the post-PCV landscape.

Probiotics and allergy treatment

The evidence for probiotics is limited and inconsistent. A 2020 systematic review of 13 studies rated their quality as poor to moderate, and it found that half of the studies that used nasal probiotic formulations showed a significant difference in reducing otitis media, while only a third of the studies using oral formulations suggested benefit. Later meta-analyses of larger pooled data, including one of 16 trials with 4,034 patients, have reported mixed results and conflicting results among various studies, some of which are inconclusive. Strain-specific network analyses are ongoing. The link between allergic rhinitis and Eustachian tube dysfunction is biologically plausible, but trials of allergy treatments have not produced consistent reductions in AOM episodes, so allergy control is generally not regarded as an established preventive measure.

Antibiotic resistance and stewardship

β-lactamase production and penicillin-nonsusceptible pneumococci

Resistance differs sharply by pathogen. In a Canadian surveillance study covering 1997 to 2002, 22.5% of 7,566 H. influenzae isolates and 92.4% of 2,314 M. catarrhalis isolates produced β-lactamase. Over the study period, the β-lactamase-positive share among H. influenzae fell from 24.2% to 18.6%, whereas the figure for M. catarrhalis stayed near 90% (the proportion of β-lactamase-producing H. influenzae declined significantly across the five years, while the M. catarrhalis proportion did not change). Resistance in H. influenzae also arises without an enzyme: chromosomal alterations in penicillin-binding proteins have produced non-β-lactamase-mediated resistance to β-lactams, which is why laboratories report β-lactamase-negative but ampicillin-resistant strains separately.

Co-colonization complicates the picture. In a study of 306 children with recurrent AOM who had received several antibiotic courses, 93% of M. catarrhalis and 43% of H. influenzae isolates produced β-lactamase, and 25% of pneumococcal strains were non-susceptible to penicillin. Where β-lactamase-producing M. catarrhalis was carried alongside pneumococci, all pneumococcal strains were penicillin-susceptible. Laboratory work suggests a mechanism: M. catarrhalis outer membrane vesicles contain active β-lactamase, which can inactivate amoxicillin and protect neighboring susceptible bacteria. Within polymicrobial biofilms, the community itself appears to shield bacteria from treatment beyond the effect of secreted enzyme.

Pneumococci remain the main concern for treatment failure. Penicillin non-susceptibility lowers the intrinsic activity of other oral β-lactams, so it has become a global problem. Prevalence varies: in a Japanese series of 175 middle-ear isolates, 26.3% were penicillin-resistant.

Effects on empirical choices and laboratory reporting

Concern about these trends led to reconsidering amoxicillin as default first-line therapy for younger children. An earlier review argued that both in vitro activity against resistant pathogens and antibiotic concentrations achieved in middle-ear fluid should guide selection for refractory AOM. Guidelines accordingly reserve ceftriaxone for second-line use or for patients with documented penicillin allergy. Amoxicillin has not been abandoned everywhere: a French study found similar proportions of β-lactamase-producing and ampicillin-resistant H. influenzae in nasopharyngeal and middle-ear fluid samples, and concluded that amoxicillin remains a valid first-line recommendation in France. Laboratories also apply conservative rules: all β-lactamase-producing H. influenzae and M. catarrhalis isolates were interpreted as amoxicillin-resistant regardless of MIC.

Surveillance

Surveillance tracks how these patterns shift. A large Canadian-scale nasopharyngeal study of children with AOM from 2006 to 2022 found stable proportions of β-lactamase-producing and ampicillin-resistant H. influenzae strains. The effect of vaccination is visible in pneumococcal data: in a study of children with AOM in the United States, the share of cases caused by non-PCV7 serogroups rose from 12% in 1999 to 32% in 2002. In France, antibiotic resistance among AOM pneumococci fell markedly between 2001 and 2011, as PCV-7 serotypes were replaced by non-PCV-7 serotypes, especially 19A. In Iceland, where penicillin non-susceptible pneumococci had been prevalent since the early 1990s, researchers followed susceptibility and serotype changes after a conjugate vaccine entered the childhood schedule in 2011 (investigating changes in antimicrobial susceptibility and serotype distribution from 2011 to 2017).

Stewardship measures

Stewardship focuses on three levers. The first is delayed prescribing: the American Academy of Pediatrics recommends delayed antibiotic prescribing for select children, and it can significantly reduce unnecessary antibiotic use. In a Colorado collaborative, the rate of delayed prescribing rose from 2% at baseline to 21% at the end of the intervention. The second is observation: a 2020s audit of outpatient encounters found that watchful waiting was used in only 22% of eligible mildly ill cases. The third is duration and diagnostic accuracy. In a pediatric emergency department review, 40% of AOM prescriptions were inconsistent with current guidelines, most commonly because of prolonged duration, and guideline non-adherence occurred in 62.6% of encounters, mainly through inappropriate prescribing and the absence of diagnostic criteria.

The tension between restraint and treatment failure

Restraint carries a risk that stewardship programs must balance. Guidelines advise longer courses for children under two, for perforated disease, for treatment failure, and for recurrence (10 rather than 5 days of therapy), so the children most at risk of complications are also those for whom shortening treatment is least appropriate. Delayed approaches require a safeguard: a mechanism must exist to ensure follow-up and to start antibiotics if the child fails observation. Some stewardship evaluations therefore track readmissions for mastoiditis or intracranial infection within 28 days of discharge as a safety outcome. How far antibiotic reduction can go before treatment failure rises in high-risk children remains an open balance rather than a settled answer.

Guidelines and the history of understanding

From ancient descriptions to the germ theory

Ear pain, discharge, and deafness were recorded long before the middle ear was understood as a site of bacterial infection. Hippocrates is generally regarded as the first to describe acute otitis media. Hippocratic writers treated severe ear pain with high fever as a life-threatening illness, and they regarded the escape of pus from the ear as a possible route to recovery. For the next 15 centuries, Galen's teachings dominated medical thought, so ear disease was usually explained through the humoral doctrine rather than through local pathology. In 1649, Riolan the Younger revisited Hippocratic teachings on the management of effusion, advocating fluid drainage to balance the humours, and he performed what is recorded as the first formal myringotomy.

Surgery remained the main intervention for several centuries. The first recorded surgical incision for ear infection was made in the 16th century by Ambroise Paré, and mastoidectomy was first performed by Jean-Louis Petit in the 17th century. The mallet-and-chisel mastoid operation persisted for roughly 75 to 80 years as the standard approach to acute mastoid infection. In the later nineteenth century, the first journal devoted to ear pathology appeared in 1865, and Adam Politzer founded the first otology clinic in 1873, which helped standardise the study of the disease. Once bacteriology matured, otitis media was reinterpreted as an infection with identifiable organisms, such as pneumococci and Haemophilus influenzae, rather than a humoral or purely nasal disorder. Earlier clinicians had already linked persistent discharge to blocked Eustachian tubes, in which pressure from adenoids or a third tonsil was held to keep a muco-purulent discharge going indefinitely.

Antibiotics and the move toward selective use

Sulfonamides and then penicillin entered clinical use in the late 1930s and 1940s, and they transformed the outlook for suppurative complications that had once required urgent surgery. Antibiotics rapidly became the default for acute otitis media, and by the late twentieth century many trials were questioning how much they added for most children. Current figures illustrate the gap between evidence and practice: about 10 million antibiotic courses are prescribed to children for acute otitis media each year, though over 80% of cases resolve without antibiotics. The shift toward restraint is reflected in the American Academy of Pediatrics' 2013 revision, which emphasized that most uncomplicated acute otitis media in children over one year of age should be managed by observation for two to three days before antibiotics are prescribed. Adoption has been uneven: evidence suggests watchful waiting is used in only 5%-20% of cases.

The evolution of clinical guidelines

Guidance now comes in separate streams for acute otitis media and for effusion. For acute disease, the AAP guideline was revised in 2013 with more stringent diagnostic criteria, and it expanded the group of young children whose care may be managed by initial observation. For effusion, several national bodies have produced independent documents. Existing overseas guidance includes the US 2004 clinical practice guideline, the UK 2008 NICE guideline for children under 12, and the Korean 2012 guideline. Japan's guideline, developed by the Japan Otological Society and the Oto-Rhino-Laryngological Society of Japan, was first issued in 2015 and updated in 2022. The 2022 Japanese update also addressed pathological changes in surrounding organs associated with infectious or inflammatory diseases, not only the effusion itself. In the United States, the AAO-HNSF released updated practice guidelines for the management of OME in 2016, endorsed by the American Academy of Family Physicians. The UK guidance was later replaced: NICE guideline NG233 covering effusion in children under 12 was published on 30 August 2023.

How evidence has altered practice

Changes in evidence have shifted recommendations in three main areas. For diagnosis, the requirement that the eardrum bulge before acute otitis media is diagnosed has tightened the criteria used to label cases. For observation, randomized trials showing that delayed prescribing reduces antibiotic use without worse outcomes have strengthened the case for watchful waiting; randomized clinical trials have shown that watchful waiting can reduce antibiotic use for acute otitis media by approximately 60% with similar patient outcomes and parent satisfaction. For effusion, the 2023 NICE guideline indicates that otitis media with effusion without hearing loss often gets better on its own and no treatment is necessary. For children whose hearing is affected, the guideline also notes that for some children a non-surgical treatment option, such as temporary hearing aids, may be a preferred first-line option. Surgical referral has therefore moved from a routine response to persistent effusion toward a decision guided by hearing, development, and the child's wider needs.

Global burden, health systems, and access to care

In high-income countries, otitis media accounts for a large share of routine pediatric work, mainly because it is so common in young children. Acute otitis media is therefore often described as the most common pediatric infectious disease and a leading cause of medical visits, antibiotic prescriptions, and hearing impairment in children. In the United States, about 16 million office visits and 13 million antibiotic prescriptions were associated with otitis media in 2000. Estimates for antibiotic use suggest that acute otitis media accounts for as much as 40% to 50% of antibiotics prescribed to American children under two years of age.

Utilization has since declined. Clinician visits for otitis media fell from 950 per 1,000 children in 1995–1996 to 634 per 1,000 in 2005–2006. Between 2011 and 2016, AOM incidence, antimicrobial prescriptions, and associated medical expenses decreased substantially in the United States, yet the average number of antimicrobial prescriptions per AOM visit stayed at roughly 0.9 throughout the period. Prescribing habits also proved resistant to guideline change. After the 2013 American Academy of Pediatrics guideline, most pediatric patients continued to be treated with antibiotics within three days of diagnosis, in a study of commercially insured children.

At the global level, the Global Burden of Disease (GBD) 2021 analysis counted 391 million episodes of otitis media in 2021, up from 316 million in 1990. Age-standardized prevalence nevertheless fell over the period, even though the age-standardized incidence rose slightly while age-standardized prevalence decreased. Burden is unevenly distributed. The rates are negatively correlated with the socio-demographic index, and the same analysis links the high burden in low and low-middle SDI regions to limited access to healthcare, inadequate vaccination coverage, and poor environmental conditions. Mortality estimates also differ widely: the GBD 2021 analysis records 536 deaths caused by otitis media in 2021, whereas an earlier systematic review had estimated about 21 thousand deaths each year from complications of otitis media. Such gaps reflect the fact that prevalence surveys vary widely in disease definition, sampling methods, and methodological quality.

Chronic suppurative otitis media (CSOM) bears most heavily on low- and middle-income countries (LMICs). A 2025 systematic review estimated a global prevalence of 3.8% of the global population, or 297 million people, 85% (252 million) of whom live in LMICs. Of those affected, 184 million (62%) had disabling hearing loss. Mean prevalence was higher in low-income countries (5.0%) than in middle-income countries (3.7%). Earlier global figures were broad, and the review's authors note that the 2004 WHO study was based on data more than 40 years old, so newer estimates were needed for planning. The paradox is that the US incidence of AOM is reported as 2- to 4-fold higher than most other high-income countries, and 3- to 6-fold higher than low- and middle-income countries, while sequelae such as CSOM and acquired deafness are more frequent in LMICs. This pattern is inconsistent with the reported low incidence rates in those countries, which suggests that acute episodes may be under-recorded there.

Several barriers explain why disease in these settings progresses to chronic stages. Diagnosis depends on reliable otoscopy, and many primary care clinicians have little training or access to pneumatic otoscopes and tympanometry, so effusion and early perforation may be missed or misjudged. Referral to ear, nose and throat specialists can be slow, and families often cannot afford tympanoplasty, mastoid surgery, or hearing aids, so untreated damage accumulates. Crowded housing and poor nutrition add to the risk: frequent acute otitis media, upper respiratory tract infections, tympanic membrane injury, inadequate nutrition, and poor living arrangements are all recognized contributors.

Outcomes depend heavily on the health system. Primary care services determine whether children are diagnosed accurately, treated selectively, and referred on time. Vaccination is a major lever: pneumococcal conjugate vaccines were introduced in the United States in 2000 (7-valent, PCV7) and 2010 (13-valent, PCV13), and national incidence declined in the years that followed. Universal health coverage matters because it governs whether families can obtain diagnosis, antibiotics, and surgery without financial hardship. The GBD authors conclude that public health interventions have been effective in higher SDI regions, but targeted efforts are needed in low and low-middle SDI regions to further reduce the burden of otitis media.

Otitis media in adults and older people

Acute otitis media in adults

Acute otitis media (AOM) is much less common after childhood. Eustachian tube dysfunction is regarded as the most important pathogenic factor for middle-ear infection in both children and adults, it is the most important factor in the pathogenesis of middle ear infections in both childhood and adulthood. In adults, an upper respiratory infection or a flare of seasonal allergic rhinitis often comes first (allergic rhinitis is a recognized trigger). AOM is typically unilateral and is associated with otalgia (ear pain) and decreased or muffled hearing. Pain can vary in intensity. If the eardrum ruptures, pain may suddenly ease, and purulent discharge may appear with sudden relief of pain, possibly accompanied by purulent otorrhea.

The bacteria involved resemble those in children. Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis are the most common causes the most common causative bacteria in acute media are Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis. Group A streptococci are rare but can cause a more severe picture, including sensorineural impairment these may cause sensorineural hearing impairment and a more severe clinical picture.

Complications are uncommon but documented. Facial paresis can develop in adult AOM even when the bony facial canal appears intact An intact bony tympanic facial canal does not protect from secondary facial paresis in adult acute otitis media. A case report describes a 74-year-old woman whose AOM presented as jugular foramen syndrome with sigmoid sinus thrombosis A 74-year-old woman presented with ear pain, hoarseness, dysphagia, dizziness, tinnitus, and hearing loss.. Antimicrobial treatment in adults is less settled than in children. One clinical reference advises antimicrobial therapy and notes that the viral share of adult cases is uncertain In adults, the prevalence of viral origin is not known for sure, and antimicrobial therapy is always recommended.

Unilateral effusion and the exclusion of malignancy

Otitis media with effusion (OME) is less prevalent in adults but still causes considerable morbidity, and cases occur in every decade of adult life. Some authors argue that adult OME is better understood as a syndrome with several possible causes than as a single disease. The most important diagnostic concern is a unilateral effusion. A long-standing clinical principle treats unilateral adult OME as nasopharyngeal carcinoma until proven otherwise This study confirms the long-held statement “unilateral OME in the adult is nasopharyngeal carcinoma until proven otherwise”. Guidance on recurrent unilateral disease calls for fiberoptic nasopharyngoscopy and/or contrast magnetic resonance imaging (MRI) of the skull base and nasopharynx to exclude a malignant process at the Eustachian tube orifice. Recurrence is defined in this context as more than two episodes over a six-month time period of unilateral AOM.

Even a minimal examination, such as an indirect mirror view or flexible nasopharyngoscopy, is considered essential At minimum, indirect mirror examination or flexible nasopharyngoscopy should be performed. Clinicians should also be aware of pitfalls. A case report describes nasopharyngeal carcinoma masked by contralateral ear symptoms and a reassuring MRI contralateral otologic symptoms and a benign-appearing MRI impression masked nasopharyngeal carcinoma. Ventilation tubes, which are standard for OME, may work poorly when the effusion is caused by a tumor OME secondary to nasopharyngeal carcinoma will not respond well to ventilation tube insertion and will very often result in persistent discharge through the tube.

Sinonasal disease, allergy, and smoking in persistence

Sinonasal disease is one of the most frequent associations in adult OME. In a prospective series of 167 adults, sinus disease was found in 66 per cent of cases, mainly in the ethmoid sinuses In a prospective series of 167 patients with adult-onset OME, Finkelstein et al. found evidence of paranasal sinus disease, particularly in the ethmoids, in 66 per cent of cases. Malignancy was far less common in the same series. Other associated factors include barotrauma, irradiation, atopy, and smoking factors that have been associated with adult OME include nasopharyngeal carcinoma (NPC), barotrauma, irrradiation, sinusitis, atopy, and smoking.

The role of allergy is plausible but not firmly established. Proposed mechanisms include Th2-type immune responses and Eustachian tube dysfunction, but the evidence base is described as often low in quality several epidemiological and experimental studies suggest a significant association, primarily through allergic mechanisms such as Th-2 immune responses, Eustachian tube dysfunction, and inflammatory mediators in the middle ear. Smoking has a more direct link to mucosal function. Smoking has been associated with reduced ciliary beat frequency in middle-ear mucosa from adults with OME Smoking has been shown to be associated with reduced ciliary beat frequency in samples of middle-ear mucosa taken from adults with OME. Adult chronic OME also tends to last longer than the childhood form, which is likely due to smoking, allergy, and sinonasal disease acting together The chronic form tends to persist longer than that seen in childhood, likely due to ongoing co-founding factors such as smoking, allergies and sinonasal disease. Treating a coexisting sinusitis is therefore part of management, alongside a nasopharyngeal check.

Hearing loss, tinnitus, and balance symptoms

Hearing impairment is usually the leading complaint in adult OME. In one adult-onset series, it was the most prevalent initial symptom, followed by ear stuffiness Hearing impairment was the most prevalent initial symptom, followed by ear stuffiness (54.5%). The primary concern in OME is conductive hearing loss, but vestibular problems and reduced quality of life also occur The clinical concern with OME is primarily conductive hearing loss, but also vestibular problems, ear discomfort, and reduced quality of life. Assessment combines examination with objective testing. Pneumatic otoscopy can reveal reduced eardrum mobility The mobility of the eardrum is impaired when examined with a pneumatic otoscope of sufficient size., and tympanometry supports the diagnosis Tympanometry is helpful in the diagnostics.. Tuning-fork tests help confirm a conductive pattern there is conductive hearing loss; Rinne test is indifferent or negative and Weber test lateralizes to the affected ear.

Tinnitus and dizziness are less specific and should prompt a full ear, nose, and throat review, including audiometry and, where balance symptoms persist, vestibular testing. Management focuses on the underlying cause. Persistent or prolonged middle-ear disease warrants referral to an ENT specialist for identifying predisposing conditions and clearing middle-ear discharge If middle ear infection becomes prolonged, the patient should be referred to an ENT specialist for diagnosing predisposing diseases and for removing middle ear discharge to improve hearing. Ventilation tubes may be considered for symptomatic effusion lasting about 12 weeks, although results in adults have been mixed Ventilation tubes have been the standard treatment for otitis media with effusion in adults, but examination of the results of published studies shows that they are associated with disappointing outcomes and significant complications. Hearing rehabilitation, such as hearing aids, is considered for persistent loss that cannot be corrected medically or surgically.

Current research and unresolved questions

Host susceptibility: genetics, immunity and the microbiome

Most children have at least one episode, but a minority develop recurrent or persistent disease, and family history is one of the clearest explanations for this difference. Chronic or recurrent disease clusters in families and shows substantial heritability, and several studies report higher risk in children whose relatives have had middle-ear disease. Sibling studies suggest a 1.6–4.2-fold increase in risk after controlling for environmental factors, though shared household exposures and inherited biology cannot be fully separated in such designs. Much of the genetic knowledge rests on common variants from a few genome-wide association studies, candidate immune genes, rare variants in a few families, and experiments in rodent models.

Candidate genes point mainly to pathogen recognition and inflammatory signaling. Polymorphisms in TLR4 may alter pathogen sensing and downstream inflammatory signaling, and variants in MBL2 encoding mannose-binding lectin may reduce complement-mediated clearance. A genome-wide study identified common and rare FUT2 variants that confer susceptibility to recurrent or chronic otitis media across several ethnic groups, and FUT2 likely modulates the middle-ear microbiome by regulating A antigen levels in epithelial cells. This last link connects host genetics to the microbial environment.

The nasopharyngeal microbiome is a second line of inquiry. In children with stringently defined otitis-proneness, frequent colonization by otopathogens and deficient innate and adaptive immune responses are both implicated. A case-control study found the nasopharyngeal microbiome of resistant children to be distinct from that of prone children, with Corynebacterium, Dolosigranulum and, to a lesser extent, Moraxella more abundant in healthy controls. Those findings motivate proposed probiotics, but some children with recurrent AOM carry none of the known otopathogens, which leaves their mechanism unexplained. Gut microbiome work is at an earlier stage: one small study found limited alterations in gut microbiota among children with recurrent AOM compared with healthy controls.

Biomarkers and rapid tests

Clinicians need to distinguish bacterial infection, viral inflammation and sterile effusion, but current tools are imperfect. No rapid and accurate diagnostic test identifies the pathogen in the middle-ear cavity, and culture alone underestimates bacterial presence. In one series, culture was positive in 14% of effusion samples, while bacterial DNA detected by PCR reached 36.7%. Molecular methods also increased detection of S. pneumoniae and H. influenzae about 3.2-fold compared with culture, which complicates the interpretation of "no pathogen found" in older studies.

Antigen-based tests have been evaluated for specific organisms. A pneumococcal immunochromatographic test showed sensitivity and specificity of 81.4% and 80.5%, respectively, for middle-ear fluid from patients with AOM. A test for group A streptococcus in children with spontaneous perforation reported excellent sensitivity, 97.3%, and specificity, 100%, though in a narrow population. Nasopharyngeal sampling is also being studied as a surrogate, since nasopharyngeal PCR results have high predictive value for middle ear fluid findings. Spectroscopic approaches, such as those described in patent literature, aim to detect bacteria in effusion so that antibiotic need can be determined, but these remain experimental.

Machine learning and computer vision

Otoscopic diagnosis is the main limitation that these tools address. Pediatricians and otolaryngologists identify middle-ear effusions correctly at rates of 51% and 73%, respectively. Deep learning reviews report that several studies reported sensitivity and specificity values exceeding 90%, but variations in dataset quality, image preprocessing, and model interpretability remain key challenges.

Validation depends heavily on the reference standard. In one study built on expert-panel labels, a majority decision could not be reached in 10% of cases, and an earlier comparison showed poor agreement between three experts when assigning reference standard diagnoses. That same study excluded wet ears, so its CSOM category covered dry chronic perforation (inactive CSOM) only. Head-to-head comparisons show promise: one study reported that the model was more accurate than clinicians, 90.6% vs 59.4%, but it was conducted in an operative setting, and its authors present it as a step towards validation of AI-based diagnosis under more real-world conditions.

Open questions

Several questions remain open. The optimal duration of antibiotic treatment for different ages and severities is still debated, and the trade-off between shorter courses and treatment failure is not fully resolved. The long-term developmental effects of early effusion are also uncertain: children under five are the group most susceptible to otitis media-related hearing loss, which could affect their developmental milestones, but the extent to which transient hearing loss causes lasting effects on language or learning is unclear. The cost-effectiveness of prevention strategies, including vaccination and behavioral measures, depends on local incidence, vaccine pricing and health-system capacity, and comparable economic evaluations across settings remain limited.

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