Skip to main content

Health condition · Clinically reviewed

Perilymph fistula, a leak between the inner and middle ear - and when it needs repair.

Sudden or fluctuating hearing loss with dizziness after trauma, diving, flying or straining is worth taking seriously. Many settle with rest - some need surgery.

Jump to treatment
A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against ENT UK, British Society of Audiology and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including fistula testing, CT temporal bones and staged surgical repair.

Key facts

Perilymph fistula at a glance.

The essentials, in plain English - what it is, what causes it, and how it’s assessed and treated in the UK today.

  • What it is

    An abnormal connection between the fluid-filled inner ear and the middle ear, allowing perilymph to leak.

  • Common causes

    Head trauma, barotrauma from diving or flying, extreme straining or Valsalva, chronic ear disease, or a rare complication of stapes surgery.

  • Core symptoms

    Sudden or fluctuating sensorineural hearing loss, dizziness or vertigo, tinnitus and a sense of ear fullness.

  • Sound and pressure triggers

    Loud noise can trigger vertigo (Tullio phenomenon), and straining, sneezing or altitude change can worsen symptoms.

  • How it is confirmed

    Audiometry, vestibular testing, CT temporal bones and a fistula test - occasionally exploratory tympanotomy when imaging is inconclusive.

  • How it is treated

    Conservative measures first for many cases - surgical patching of the fistula for persistent symptoms or a clear structural defect.

Why this guide matters

An underdiagnosed cause of hearing loss and dizziness.

Perilymph fistula is easy to miss because imaging often looks normal. The three points below shape everything else on this page.

  • History matters more than imaging

    Trauma, barotrauma, straining or recent ear surgery in the story often points to the diagnosis before any scan does.

  • Many settle without surgery

    Conservative measures - rest, head elevation, avoiding pressure changes - resolve a good number of cases within weeks.

  • Surgery works when it is needed

    For persistent symptoms or a clear structural defect, patching the fistula is a well-established and generally effective repair.

How the diagnosis is made

From first symptoms to a confirmed diagnosis.

The steps a UK ENT team or neurotologist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    Clinical history

    A careful history of trauma, barotrauma, straining or recent ear surgery - the pattern that points strongly towards a fistula.

  2. 02

    Assessing

    Audiometry

    Documents the hearing loss - its degree, type and whether it fluctuates over time.

  3. 03

    Assessing

    Vestibular testing

    Assesses balance-system function and helps characterise the dizziness alongside the hearing changes.

  4. 04

    Confirming

    Fistula test

    Pressure is applied to the ear canal to check for induced nystagmus or symptoms - a bedside clue to a leak.

  5. 05

    Confirming

    CT temporal bones

    Imaging looks for a structural abnormality of the inner or middle ear, though it cannot always show the leak itself.

  6. 06

    Confirming

    Specialist ENT/neurotology referral

    Given the limits of imaging, a specialist opinion is central to reaching a confident diagnosis and plan.

  7. 07

    Deciding

    Exploratory tympanotomy

    Occasionally needed for definitive diagnosis when the history is strongly suggestive but tests remain inconclusive.

Typical timeline: a first assessment to a settled plan in one to a few weeks.

Symptoms

What a perilymph fistula actually feels like.

The classic mix of hearing loss, dizziness and pressure sensitivity. And the features that mean it’s time to escalate.

  • Sudden or fluctuating hearing loss

    Sensorineural hearing loss that appears suddenly or comes and goes - often the symptom that prompts the first assessment.

  • Dizziness and vertigo

    A spinning or unsteady sensation, sometimes brought on or worsened by pressure changes or straining.

  • Tullio phenomenon

    Vertigo triggered by loud sounds - a distinctive feature that should raise suspicion of a perilymph fistula.

  • Worse with straining or sneezing

    Symptoms provoked or made worse by heavy lifting, straining, coughing or sneezing - anything that raises inner-ear pressure.

  • Tinnitus

    Ringing, buzzing or hissing in the affected ear, often alongside the hearing loss and dizziness.

  • Sensation of ear fullness

    A blocked or full feeling in the ear, similar to the sensation of altitude change or a cold.

  • Worse with altitude or air travel

    Flying or driving over mountain passes can bring on or intensify symptoms because of the pressure shift.

  • Red flag - sudden profound loss

    Sudden, severe hearing loss or worsening vertigo after trauma, surgery or diving needs urgent ENT assessment.

Treatment

How perilymph fistula is treated in the UK.

Conservative measures first for many cases - surgical patching for persistent symptoms or a clear structural defect.

  • Bed rest and head elevation

    Initial conservative management - keeping the head raised and activity low gives many small leaks a chance to seal.

  • Avoiding Valsalva and straining

    Steering clear of heavy lifting, straining and forceful nose-blowing reduces pressure across the fistula while it heals.

  • Avoiding flying and diving

    Air travel and diving are paused during recovery, since both involve the pressure changes that provoke symptoms.

  • Activity modification

    A graded return to normal activity, guided by symptoms, rather than a rapid return to strenuous exercise.

  • Vestibular rehabilitation

    Targeted balance exercises for ongoing dizziness, whether the fistula has settled conservatively or been repaired surgically.

  • Surgical repair (patching)

    For persistent symptoms or a clear structural defect, the fistula is patched surgically - usually with good results.

  • Serial audiometry

    Repeat hearing tests track recovery or deterioration and help decide whether surgery is needed.

  • Specialist ENT/neurotology follow-up

    Ongoing review by a specialist commissioned service, particularly where symptoms persist or recur.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or ENT specialist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • ENT UK. Guidance on inner ear disorders and perilymph fistula.

  • British Society of Audiology. Audiometric assessment standards.

  • American Academy of Otolaryngology-Head and Neck Surgery. Clinical guidance on perilymph fistula.

  • NHS. Information on sudden hearing loss and dizziness.

Red flags

When it needs urgent attention.

Most cases can be assessed and managed without urgency. These are the situations that can’t wait.

  • Sudden profound hearing loss

    A sudden, severe drop in hearing is an ENT emergency and needs same-day or next-day assessment.

  • Worsening vertigo despite rest

    Dizziness that keeps escalating on conservative management is a signal to bring forward specialist review.

  • Symptoms after stapes surgery

    New hearing loss or vertigo following stapes surgery is a recognised, though rare, complication needing prompt reassessment.

  • Clear fluid otorrhoea

    Clear discharge from the ear after trauma or surgery could represent a perilymph or CSF leak and warrants urgent review.

  • New neurological signs

    Facial weakness, double vision or other neurological features alongside ear symptoms need urgent specialist assessment.

  • Symptoms after significant head trauma

    Hearing loss or vertigo following a head injury should be assessed promptly, particularly if it is new or worsening.

  • Recurrent barotrauma

    Repeated diving or flying episodes with worsening symptoms increase the risk of an established fistula.

  • Bilateral involvement

    Symptoms affecting both ears are less typical and deserve a broader specialist work-up.

  • No improvement after two weeks

    Failure to settle with conservative measures is a common trigger for considering surgical repair.

Living with it

A treatable condition, with a clear plan.

Four things that make the biggest difference during recovery - resting the ear, respecting pressure changes, working on balance and knowing when to ask about surgery.

A quiet reminder

Patience with pressure pays off.

Resisting the urge to fly, dive or strain too soon protects the ear while it has the best chance to heal.

  1. 01 Rest

    Avoid heavy lifting and straining

    Give the ear time to heal by keeping activity low and avoiding anything that raises pressure in the head.

  2. 02 Pressure

    Hold off on flying and diving

    Wait until you are cleared by your specialist before air travel, diving or activities involving rapid pressure change.

  3. 03 Balance

    Try vestibular rehabilitation

    Guided balance exercises can ease ongoing dizziness, whether or not surgery has been needed.

  4. 04 Escalate

    Ask about surgery if symptoms persist

    If conservative measures are not enough, surgical patching has good outcomes for a confirmed or strongly suspected fistula.

Frequently asked

Everything we get asked about perilymph fistula.

Quick answers on causes, diagnosis, recovery and surgery.

  • What is a perilymph fistula?

    An abnormal connection between the fluid-filled inner ear and the middle ear, which allows perilymph to leak. This can cause hearing loss and balance disturbance because the inner ear relies on a stable fluid environment to work properly.

  • What causes a perilymph fistula?

    Head trauma, barotrauma from diving or flying, extreme straining or Valsalva manoeuvres, and chronic ear disease are the usual causes. It occasionally occurs spontaneously or congenitally, and is a recognised rare complication of stapes surgery.

  • How is a perilymph fistula diagnosed?

    Diagnosis combines a careful history, audiometry, vestibular testing, a fistula test and CT temporal bones. Because imaging has limits, exploratory tympanotomy is occasionally needed to confirm the diagnosis.

  • Does a perilymph fistula heal on its own?

    Many do, with conservative management - bed rest, head elevation and avoiding straining, flying or diving. Symptoms that persist or a clear structural defect usually point towards surgical repair.

  • What does surgical repair involve?

    The surgeon patches the fistula to seal the leak between the inner and middle ear. It is generally reserved for persistent symptoms after conservative management, or where imaging shows a clear defect.

  • Can I fly or dive after a perilymph fistula?

    Not until your specialist confirms it is safe. Flying and diving both involve pressure changes that can provoke symptoms or disturb healing, so they are avoided during recovery and cleared individually afterwards.

Related content

Keep reading.