Ear Infections in Children
Middle ear infections — acute otitis media — are among the most common infections in childhood, second only to upper respiratory tract infections in frequency. By the age of three, approximately 80% of children will have experienced at least one episode; by school age, many will have had five or more. Understanding the anatomy, mechanisms, natural history, and treatment options for childhood middle ear infections is important for parents and for any clinician managing children.
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Anatomy of the Middle Ear and Eustachian Tube
The middle ear is an air-filled space behind the eardrum (tympanic membrane), housed within the temporal bone of the skull. It contains the three hearing ossicles — the malleus, incus, and stapes — which transmit sound vibrations from the eardrum to the inner ear. The middle ear communicates with the back of the nose and throat via the Eustachian tube, a narrow passage approximately 35mm long in adults that runs obliquely from the middle ear to the nasopharynx.
The Eustachian tube serves three physiological functions: pressure equalisation (opening transiently during swallowing and yawning to allow air in and equalise middle ear pressure with atmospheric pressure), mucociliary drainage of middle ear secretions into the nasopharynx, and protection of the middle ear from sound pressure and nasopharyngeal secretions.
In infants and young children, the Eustachian tube is significantly shorter, more horizontal, and less stiff than in adults. This anatomical difference explains why children are disproportionately susceptible to middle ear infections: the shorter, more horizontal tube allows pathogens from the nose and throat to ascend into the middle ear more easily, and the tube’s relative flaccidity means it collapses more readily under negative pressure rather than opening to ventilate the middle ear. As children grow, the Eustachian tube lengthens, develops a steeper angle, and becomes stiffer — which is why the frequency of middle ear infections typically decreases substantially after the age of six to seven years.
How Middle Ear Infections Develop
Acute otitis media most commonly follows an upper respiratory tract infection. Viral infection of the nasal and nasopharyngeal mucosa causes inflammation, oedema, and impaired mucociliary function in the Eustachian tube lining. This can result in obstruction of the tube, creating negative pressure in the middle ear as the air already present is absorbed by the mucosa. This negative pressure draws nasopharyngeal secretions — containing bacteria or viruses — into the middle ear space.
The most common bacterial pathogens responsible for acute otitis media are Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis. Viral infections — particularly respiratory syncytial virus, rhinovirus, influenza, and parainfluenza — are the primary triggers in many episodes, either as the sole cause or as the precursor to secondary bacterial infection.
Once infection is established in the middle ear, the mucosal lining becomes inflamed and oedematous. Fluid accumulates, building pressure against the eardrum. In some cases the pressure is sufficient to cause spontaneous rupture of the eardrum, releasing the fluid and transiently relieving pain. The tear in the eardrum typically heals within a few days once the infection resolves.
Symptoms
The classical presentation of acute otitis media in an older child or adult includes sudden-onset ear pain (otalgia), often severe, associated with fever, reduced hearing, and sometimes ear fullness. In infants and toddlers who cannot reliably localise pain, the presentation is often less specific: irritability, poor sleep, tugging or rubbing at the ear, feeding difficulties, and fever. Not all children tug their ears with middle ear infections, and not all children who tug their ears have middle ear infections.
- Ear pain (otalgia): Typically sudden in onset, severe, and often worse at night. Older children report it directly; infants demonstrate it through inconsolable crying and sleep disturbance.
- Fever: Common but not universal. The absence of fever does not exclude the diagnosis.
- Hearing loss: Mild to moderate conductive hearing loss is typical during the acute infection. Children may seem inattentive, turn up the television, or ask for things to be repeated.
- Ear discharge: If the eardrum perforates, a mucopurulent discharge drains into the ear canal. Pain typically improves at this point as the pressure is released. The discharge usually settles and the eardrum heals within a few days.
- Balance disturbance: Some children experience transient imbalance or unsteadiness during and after an episode.
- Irritability and poor feeding (in infants): Non-specific but frequently reported by parents.
- Pain, swelling, or tenderness behind the ear (mastoid region) — this may indicate acute mastoiditis, a serious complication requiring urgent treatment
- The child appears systemically very unwell — high fever, severe headache, neck stiffness, or altered consciousness
- The child has a facial weakness or droop
- Significant dizziness or loss of balance
- Ear discharge that does not settle within a few days
Diagnosis
The diagnosis of acute otitis media is made clinically, by visualising the eardrum with an otoscope. A normal eardrum is pearlescent grey and semi-transparent. In acute otitis media, the eardrum appears red, opaque, and bulging — the bulging appearance reflecting the pressure of the fluid behind it. A perforated eardrum with discharge in the ear canal confirms the diagnosis in that setting.
Tympanometry — a test that measures eardrum compliance by creating small pressure changes in the ear canal — can provide objective evidence of fluid behind the eardrum and is particularly useful in children who are difficult to examine. A flat tympanogram (Type B) is consistent with middle ear fluid.
Audiological testing is not routinely required for an acute episode but is appropriate when hearing loss persists after resolution of the infection, or when assessing the cumulative impact of recurrent infections on hearing.
Natural History and Prognosis
The majority of acute otitis media episodes in children resolve spontaneously without antibiotic treatment within two to three days. Systematic reviews have shown that approximately 80% of children who are managed with watchful waiting recover fully without antibiotics. The principal benefit of antibiotics, when prescribed, is a modest reduction in the duration of symptoms — from approximately three days to two days — and a reduction in the proportion of children with persistent pain at 24 hours.
Following resolution of the acute infection, fluid often remains in the middle ear — a condition known as otitis media with effusion (glue ear). In most children this fluid clears spontaneously within three months. In a minority it persists, causing ongoing conductive hearing loss.
Treatment
Watchful Waiting
Current Australian and international guidelines recommend a period of watchful waiting before prescribing antibiotics in most children over two years of age with acute otitis media who are not severely unwell. During this period, analgesia with paracetamol and ibuprofen is the mainstay of management. If symptoms worsen or do not improve within 48–72 hours, antibiotics are then indicated. In children under two years, or in children with bilateral infection, high fever, or marked severity, earlier antibiotic treatment is generally appropriate.
Antibiotics
Amoxicillin remains the first-line antibiotic for bacterial acute otitis media in Australia. High-dose amoxicillin (80–90 mg/kg/day) provides adequate coverage against the common pathogens, including many penicillin-intermediate strains of Streptococcus pneumoniae. Amoxicillin-clavulanate is used in patients who fail to respond to amoxicillin, or where beta-lactamase-producing organisms (such as Haemophilus influenzae) are suspected. Azithromycin or erythromycin may be used in penicillin-allergic patients.
Management of Recurrent Acute Otitis Media
Recurrent acute otitis media is defined as three or more documented episodes in six months, or four or more episodes in twelve months. At this threshold, surgical intervention is generally considered. Grommet insertion — the placement of a small ventilation tube through the eardrum under general anaesthesia — reduces the frequency and severity of subsequent infections by providing a permanent ventilation pathway for the middle ear, bypassing the dysfunctional Eustachian tube. Adenoidectomy may be performed at the same time, particularly in children with large adenoids, adenoid-related symptoms, or previous grommet insertion that did not provide adequate benefit.
Complications of Acute Otitis Media
Serious complications of acute otitis media are uncommon in the antibiotic era but remain important to recognise.
Acute Mastoiditis
The mastoid is the honeycomb of air cells within the temporal bone immediately behind the ear. These cells communicate with the middle ear and can become infected during an episode of acute otitis media. In its mildest form, the mastoid is simply involved in the same infective process as the middle ear. In its more severe form — coalescent mastoiditis — the bony septae between the air cells are eroded, creating a reservoir of pus that can spread beyond the mastoid bone. Signs of acute mastoiditis include post-auricular erythema, swelling and tenderness, and displacement of the pinna forward and downward. It requires urgent hospital admission, intravenous antibiotics, and in many cases surgical drainage (cortical mastoidectomy).
Meningitis and Intracranial Complications
Before the antibiotic era, intracranial extension of ear infections — including meningitis, extradural abscess, subdural empyema, and brain abscess — was a significant cause of mortality. These complications remain possible and must be considered in any child with acute otitis media who presents with severe headache, neck stiffness, altered consciousness, or focal neurological signs. Urgent CT imaging and neurosurgical consultation are required.
Facial Nerve Palsy
The facial nerve runs through the temporal bone in close proximity to the middle ear. Infection can spread to involve the nerve sheath, causing facial weakness on the affected side. This is a medical emergency requiring immediate assessment, IV antibiotics, and consideration of surgical drainage.
Persistent Hearing Loss
Repeated middle ear infections over years can cause permanent conductive hearing loss from damage to the eardrum or hearing ossicles, or — less commonly — sensorineural hearing loss from spread of infection to the inner ear. This is one of the primary reasons to consider grommet insertion in children with frequent recurrences.
Prevention
- Breastfeeding: Breastfeeding through at least the first six months of life provides immunological protection and significantly reduces the incidence of middle ear infections
- Passive smoke avoidance: Exposure to cigarette smoke is one of the strongest modifiable risk factors for recurrent otitis media. Eliminating smoking in the household substantially reduces the risk.
- Vaccination: The 13-valent pneumococcal conjugate vaccine (Prevenar 13) and annual influenza vaccination reduce the burden of the most common bacterial and viral causes of otitis media. Both are included in the Australian National Immunisation Program.
- Reduce dummy use: Pacifier use, particularly beyond six months, increases the risk of otitis media and should be limited where possible.
- Bottle-feeding position: Avoid bottle feeding in the supine (lying flat) position — this promotes pooling of milk around the Eustachian tube opening.
- Childcare attendance: Attendance at group childcare is an independent risk factor for recurrent otitis media, related to increased exposure to respiratory pathogens. This should not deter childcare attendance, but provides context for why some children in group care are particularly affected.
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Dr Roth’s Clinical Perspective
Acute otitis media in children is one of the most common conditions I see, and the most consistent advice I give parents is about watchful waiting versus antibiotics. For a healthy child over two years of age with non-severe acute otitis media, current evidence supports a 48–72 hour observation period before prescribing antibiotics — the majority will resolve without them. The threshold for earlier antibiotic treatment is lower in children under two, in those with severe symptoms, with bilateral disease, or with otorrhoea. Understanding these criteria helps parents know when to wait and when to act, which reduces unnecessary antibiotic use without compromising care.
— Dr Jason Roth, MBBS, FRACS (ORL-HNS), IBCFPRS
Specialist Otolaryngologist & Head and Neck Surgeon
Specialist registration — Otorhinolaryngology, Head & Neck Surgery
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