Perforated Eardrum
A perforated eardrum — a hole or tear in the tympanic membrane — is a common clinical problem arising from a variety of causes. The eardrum is a delicate, semi-transparent membrane approximately 8–9mm in diameter that separates the outer ear from the middle ear. It serves both to protect the middle ear from environmental pathogens and to vibrate in response to sound, transmitting those vibrations to the hearing ossicles. A perforation compromises both functions — creating an opening through which water and bacteria can enter the middle ear, and reducing the efficiency of sound transmission.
The majority of eardrum perforations are small and heal spontaneously with appropriate care. Understanding when spontaneous healing is likely, when to seek assessment, and when surgical repair is warranted allows patients to make informed decisions about their management.
Read about myringoplasty — surgical repair of the eardrum →
Anatomy of the Eardrum
The eardrum (tympanic membrane) is divided anatomically into two parts:
- Pars tensa: The large, taut lower portion of the eardrum, consisting of three layers — an outer epithelial layer (continuous with the ear canal skin), a fibrous middle layer (providing tensile strength), and an inner mucosal layer (continuous with the middle ear mucosa). This is where most traumatic and infection-related perforations occur.
- Pars flaccida: The smaller, lax upper portion, lacking the fibrous middle layer. This area is more susceptible to retraction pockets and cholesteatoma formation than to traumatic perforation.
The fibrous middle layer of the pars tensa is the key to the eardrum’s ability to heal spontaneously — it provides a scaffold onto which epithelial cells can migrate. Large perforations that damage this layer extensively, or perforations in patients with compromised healing (diabetes, immunosuppression, chronic infection), are less likely to heal without surgical intervention.
Causes
Infection (Acute Otitis Media)
The most common cause overall, particularly in children. During an episode of acute middle ear infection, pus accumulates under pressure behind the eardrum. When the pressure exceeds the tensile strength of the membrane, it ruptures — releasing the pus into the ear canal and typically relieving the pain dramatically. These infection-related perforations are usually small, central, and heal spontaneously within a few weeks once the infection resolves. The key to maximising healing is keeping the ear dry and treating the infection appropriately with antibiotic ear drops.
Direct Trauma
The eardrum can be perforated by a variety of direct mechanisms:
- Cotton buds — the most common preventable cause. A sudden unexpected movement of the arm while the cotton bud is in the ear is sufficient to perforate the eardrum.
- A slap or palm strike to the ear — the sudden air pressure wave from a cupped hand strike to the ear canal can rupture the eardrum. This mechanism is common in domestic violence and assault presentations.
- Sports injuries — blunt head trauma, particularly in contact sports
- Industrial accidents — high-pressure air blasts, metal fragments from welding, and other occupational injuries
- Surgical — rare, but grommet insertion carries a very small risk of residual perforation
Barotrauma
Rapid pressure changes during air travel, scuba diving, or blast injury can generate pressure differentials across the eardrum sufficient to cause perforation. Barotrauma perforations are typically associated with severe acute pain at the moment of injury, followed by sudden relief as the pressure equalises through the perforation. They are usually small and heal readily.
Chronic Ear Disease
Chronic suppurative otitis media — longstanding infection of the middle ear and mastoid — can cause persistent perforation associated with recurrent discharge. These perforations are often larger, involve the margins of the eardrum, and may be associated with granulation tissue, polyps, or cholesteatoma requiring surgical management.
Grommet Extrusion
After a grommet extrudes naturally, the eardrum usually heals completely. In approximately 1–2% of cases a small residual perforation remains, most commonly when the grommet extrudes too quickly before the eardrum can heal, or when a long-term T-tube is removed. Most small post-grommet perforations eventually close spontaneously; larger ones may require surgical repair.
Symptoms and Consequences
The clinical consequences of an eardrum perforation depend primarily on its size, location, duration, and whether it is associated with ongoing infection:
Hearing Loss
All perforations cause some degree of conductive hearing loss. The magnitude of the loss depends primarily on the size of the perforation — the larger the hole, the less effective the eardrum is at transmitting sound. A very small perforation may cause only 10–15 dB of hearing loss; a large perforation involving more than half the eardrum can cause 30–40 dB of conductive loss. Once the perforation heals — either spontaneously or surgically — hearing typically returns to the pre-perforation baseline, provided the ossicular chain and inner ear have not been damaged by repeated infections.
Recurrent Ear Infections
The eardrum normally prevents water, bacteria, and debris from entering the middle ear. A persistent perforation eliminates this protective barrier — water entering the ear canal during bathing, swimming, or even in rain can reach the middle ear directly, seeding bacteria and causing recurrent infection. Each episode of otitis media through a perforated eardrum risks progressive damage to the hearing ossicles and cochlea, contributing over years to permanent hearing loss.
Cholesteatoma Risk
A perforation allows squamous epithelium (skin) from the ear canal to migrate into the middle ear — a process that can lead to cholesteatoma formation. Although this is more commonly associated with retraction pockets than simple central perforations, any persistent perforation warrants regular monitoring.
Diagnosis and Assessment
Many perforations are first identified by a GP using an otoscope. ENT assessment allows more detailed evaluation:
- Microscopic examination of the ear canal and eardrum under magnification, allowing assessment of the size, location, margins, and condition of the perforation, and identification of any underlying middle ear pathology
- Formal audiometry (pure tone and speech audiometry) to document the hearing loss and provide a baseline for comparison
- Tympanometry — a flat tympanogram confirms perforation and absence of eardrum compliance
- CT scan of the temporal bone where cholesteatoma, ossicular chain disruption, or chronic mastoid disease is suspected
Treatment
Conservative Management
The initial management of most perforations is a period of watchful waiting, with meticulous ear hygiene. The key principles are:
- Keep the ear scrupulously dry — no swimming, careful bathing with ear canal protection
- Treat any active infection promptly with antibiotic ear drops (not systemic antibiotics in most cases)
- Avoid cotton buds and any instrumentation of the ear canal
- Monitor at regular intervals for spontaneous healing and to check for complications
The majority of acute perforations from infection or trauma heal spontaneously within four to eight weeks given appropriate care. The probability of spontaneous healing decreases with increasing perforation size, increasing duration (chronic perforations rarely close without surgery), and in the presence of ongoing infection.
Surgical Repair (Myringoplasty)
Surgical repair is considered when the perforation has not healed spontaneously after an adequate observation period (typically three to six months), or when there are ongoing symptoms justifying earlier intervention. The indications include:
- Recurrent otitis media through the perforation despite ear protection
- Persistent mucopurulent discharge not controlled by drops
- Hearing loss from the perforation that is affecting daily life
- Wish to be able to swim without ear protection
- Cholesteatoma identified or suspected
Read about myringoplasty in detail →
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Dr Roth’s Clinical Perspective
Not every perforated eardrum needs to be repaired. Small perforations in patients with otherwise normal hearing, no recurrent infections, and no desire to swim freely are often best managed conservatively — they are monitored rather than operated on. The indications for myringoplasty are recurrent middle ear infections through the perforation, significant hearing loss attributable to the perforation, and patient preference in the context of lifestyle limitations from water precautions. The decision should be made after a proper audiological assessment and a frank discussion of what surgery involves and what the realistic success rate is for the specific perforation anatomy.
— Dr Jason Roth, MBBS, FRACS (ORL-HNS), IBCFPRS
Specialist Otolaryngologist & Head and Neck Surgeon
Specialist registration — Otorhinolaryngology, Head & Neck Surgery
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