Swimmer's ear (otitis externa) can cause temporary tinnitus: swelling in the ear canal changes how sound reaches the eardrum, and the ringing usually eases as the infection clears, typically within a week to ten days of treatment.
It is common, usually minor, and treatable, and tinnitus is one of its less-discussed symptoms, easy to miss as connected to what feels like a routine ear infection.
What it is
Otitis externa — commonly called swimmer's ear — is inflammation or infection of the outer ear canal, the passage between the outside of the ear and the eardrum. An infection behind the eardrum is a different condition, otitis media. Swimmer's ear is common: Cleveland Clinic notes it affects roughly 1 in 10 people at some point in their lives, occurring most often in older children and young teens, though it can happen at any age. Despite the name, it doesn't require swimming specifically — any moisture trapped in the ear canal (from showering, humid climates, or sweating) can create the damp environment bacteria and fungi need to grow.
Why it can cause tinnitus
Swelling and inflammation in the ear canal can affect how sound travels to the eardrum, similar in principle to the conductive mechanism covered in the article on earwax and tinnitus — a partially blocked or swollen canal changes the sound reaching the eardrum, and some people experience tinnitus alongside the more typical muffled hearing this causes. Both Mayo Clinic and other clinical sources note that hearing changes from otitis externa are generally temporary, resolving once the infection clears, and tinnitus specifically tends to follow the same pattern — present during the active infection, improving as it resolves.
The full symptom picture
Swimmer's ear typically presents with a recognizable cluster: ear pain (often worse when touching or wiggling the outer ear or earlobe), itchiness inside the ear canal, redness and swelling, a feeling of fullness, muffled hearing, and sometimes discharge — which can be thin and watery or thicker and foul-smelling depending on the specific infection. Tinnitus, when present, shows up alongside this cluster rather than as an isolated symptom, which is a useful distinguishing feature: if ear pain, itching, and possibly discharge are present alongside new tinnitus, an outer ear infection is a much more likely explanation than something requiring the more extensive workup covered in the article on your first audiology appointment.
Why it happens
The ear canal is normally somewhat self-protective — earwax has antimicrobial properties and the canal's shape and skin help resist infection. Otitis externa develops when that protection is compromised: prolonged water exposure softening the skin, damage to the canal from cotton swabs or fingernails (the same habit flagged as harmful in the article on earwax and tinnitus), earbuds or hearing aids causing minor skin breaks, or skin conditions like eczema or psoriasis affecting the canal directly. Diabetes is also listed as a risk factor, plausibly related to the broader immune and circulatory effects of diabetes covered in this site's article on diabetes and tinnitus.
What to do
- See a doctor for proper diagnosis and treatment — swimmer's ear is typically treated with antibiotic or antifungal ear drops, and self-diagnosing versus a different ear problem isn't reliable without an otoscope exam
- Don't put anything in the ear canal, including cotton swabs, while symptoms are present — this is both a common cause and something that delays healing
- Keep the ear dry during treatment and recovery — avoid swimming and try to keep water out of the ear while showering until it's resolved
- Complete the full course of prescribed drops even if symptoms improve early, since incomplete treatment is a common reason for recurrence or the infection becoming chronic
Most cases clear up within a week to ten days with appropriate treatment. Left untreated, infection can spread to nearby tissue, and a small share of cases become chronic (lasting more than three months) — reason enough to treat it properly rather than waiting it out.
What the guideline and the trials say about treatment
The American Academy of Otolaryngology–Head and Neck Surgery Foundation's clinical practice guideline on acute otitis externa, updated in 2014, is specific about what good treatment looks like. Its two strong recommendations are that clinicians should assess pain and recommend pain relief matched to how severe it is, and that they should not prescribe oral antibiotics as the first treatment for uncomplicated swimmer's ear unless the infection has spread beyond the ear canal or specific health factors call for them. It also recommends that clinicians:
- prescribe ear drops as the initial treatment for uncomplicated cases
- explain how to use the drops, and clean the canal or place a wick to carry the drops in when swelling has blocked it
- check for factors that change the treatment, including a perforated eardrum, a tympanostomy tube (grommet), diabetes, a weakened immune system or previous radiotherapy
- use drops that are not toxic to the inner ear when the eardrum is known or suspected to be perforated, including when a tympanostomy tube is in place
- reassess anyone who has not responded within 48 to 72 hours, to confirm the diagnosis and look for other causes
The drop recommendation for a perforated eardrum is the part that bears most directly on hearing and tinnitus: some antibiotic drops can harm the inner ear if they get past the eardrum, which is covered in ototoxic ear drops and ototoxic medications. If you know your eardrum has a hole, or you have tympanostomy tubes, say so.
The trial evidence behind those drops is modest in quality but consistent in direction. A 2010 Cochrane review of 19 randomised trials and 3,382 participants rated the studies as low quality overall, and still concluded that drops alone, without oral antibiotics, are effective for uncomplicated cases, and that in most cases the choice of drop makes little difference to the outcome. With antibiotic-steroid drops, symptoms lasted about six days after treatment began. The reviewers suggested using drops for at least a week, continuing for up to a further seven days if symptoms persist, and treating symptoms that last beyond two weeks as a treatment failure that needs a different approach.