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Immunotherapy Side Effects · Heart, Kidney, Muscle & Nerve Reactions
Hearing Loss and Ear Symptoms — on Immunotherapy
New hearing loss, ringing in the ears (tinnitus) or a blocked-ear feeling can occur during checkpoint-inhibitor immunotherapy. It is a rare immune-related reaction affecting the inner ear or hearing nerve, but sudden or one-sided cases are time-sensitive — the chance of recovering hearing is highest when it is assessed and treated within the first few days. It should never be assumed to be wax, a cold or ordinary ageing without being checked first.
Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed August 2026
- Genuine, but rare — hearing loss and tinnitus are recognised, uncommon immune-related reactions to checkpoint-inhibitor immunotherapy.
- Time-sensitive — sudden or one-sided hearing loss has the best chance of recovery when tested within 24-72 hours.
- Easy to dismiss — mild ear fullness or ringing is often mistaken for wax, a cold, or unrelated ageing.
- Go to the ER for red flags — facial weakness, severe vertigo or slurred speech alongside hearing changes need emergency care.
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Symptom triage
How Urgent Is Hearing Loss or Ringing in the Ears on Immunotherapy?
Sudden or one-sided hearing loss during immunotherapy needs same-day assessment because the treatment window for the best chance of recovery is narrow — it is not something to monitor for a few days. Gradual hearing changes or tinnitus alone are less urgent but should still be reported promptly, since early testing gives the widest range of treatment options.
Go to the ER now if hearing loss appears together with any of these:
- Facial weakness or drooping on one side
- Severe dizziness, vertigo or loss of balance
- Slurred speech or difficulty walking
- A severe new headache unlike any before
For sudden, one-sided, or otherwise new hearing loss, ringing or ear fullness on its own, call the CION helpline the same day for an urgent audiology/ENT referral:
Call the CION Helpline Now: 1800 202 8726
Know the difference
Is Hearing Loss a Known Effect of Immunotherapy?
Yes, though it is rare. Checkpoint-inhibitor immunotherapy has been linked to sudden or gradually worsening hearing loss, tinnitus and a blocked-ear sensation as an uncommon immune-related adverse event, reported in case series and pharmacovigilance reviews rather than large clinical trials. Published data on this specific reaction is still more limited than for better-studied effects like colitis or thyroid problems, which is one more reason any new hearing change is checked rather than assumed to be unrelated.
| Feature | Everyday cause (wax, cold, loud noise) | Possible immune-related hearing loss — needs review |
|---|---|---|
| Onset | Gradual, or clearly linked to a cold, flight, or loud event | New or worsening during immunotherapy, with no obvious trigger |
| Sides affected | Usually both ears, or explained by a known cause | Often one ear only, or sudden in either ear |
| Associated symptoms | Mild fullness that clears with time or ear care | Persistent ringing, fullness or hearing drop that does not settle |
| Other neuro symptoms | Absent | Facial weakness, severe vertigo or imbalance alongside it |
| Response to time | Improves within days on its own | Stays the same or worsens |
Timing matters
When Should Hearing Changes on Immunotherapy Be Tested?
As soon as they are noticed. A pure-tone hearing test (audiometry) and an ENT or audiology assessment are ideally done within 24 to 72 hours of a new hearing change starting, mirroring the standard emergency timeline used for sudden sensorineural hearing loss generally — because the treatment window for the best chance of recovery is narrow.
| Stage | What's typically happening |
|---|---|
| Typically starts | Can occur at any point during checkpoint-inhibitor immunotherapy, including after just a few cycles — there is no single fixed window, unlike some other immune reactions. |
| First 24-72 hours | The priority window for a hearing test and specialist review if hearing loss is sudden or one-sided — outcomes are best when steroids and treatment start within this period. |
| If untested | The chance of recovering the affected hearing falls the longer testing and treatment are delayed. |
There is no home-remedy that safely treats immune-related hearing loss — ear drops, warm compresses or wax-clearing kits will not help and may delay the correct test. The right response is always the same: report it the same day and get a hearing test arranged.
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Don't Wait Out a New Hearing Symptom on Immunotherapy
Our tumour board works with ENT and audiology specialists on immune-related hearing reactions.
What recovery looks like
Is Hearing Loss From Immunotherapy Reversible?
It can be, especially when it is picked up and treated early. As with sudden sensorineural hearing loss from other causes, the chance of recovering hearing is highest when steroids and specialist care start within the first few days of symptoms appearing. Some patients recover fully, some partially, and in a smaller number the affected hearing does not return — the outcome depends heavily on how quickly it is tested and treated, not on how mild it first seemed.
Tinnitus that appears without a measurable hearing drop often settles on its own or with monitoring, but it is still worth reporting early, since it can be the first sign of inner-ear or nerve involvement before a hearing test shows a change.
What comes after you call
How Hearing Loss on Immunotherapy Is Diagnosed and Treated
Reporting a new hearing symptom early leads to a structured pathway, not guesswork — ordinary causes are ruled out alongside the immune-related possibility, and treatment starts promptly where it's needed.
- 1
Same-day hearing test (audiometry)
A pure-tone hearing test measures exactly how much hearing has changed and in which ear, giving a clear baseline to work from.
- 2
ENT or audiology referral, without delay
An ear, nose and throat specialist examines the ear directly to rule out wax, infection or fluid before considering an immune cause.
- 3
Basic exam to rule out neurological involvement
Your team checks for facial weakness, balance problems or other nerve signs that would point to a wider immune reaction needing urgent neurology input.
- 4
Steroids, if confirmed as immune-related
Treatment usually starts with corticosteroids under joint ENT and oncology supervision, started as early as possible for the best chance of recovery.
- 5
Decision on immunotherapy
Mild, stable tinnitus alone often allows immunotherapy to continue with closer monitoring; confirmed or worsening hearing loss usually means pausing treatment while your tumour board reviews next steps.
Care during treatment
Rare Reactions Are Manageable When Caught Early
Patients who report new hearing or ear symptoms promptly are supported by the same multidisciplinary team throughout treatment.
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Common questions
Hearing Loss on Immunotherapy: Your Questions Answered
Is hearing loss a known side effect of immunotherapy?
Yes, though it is rare. Checkpoint-inhibitor immunotherapy has been linked to sudden or gradually worsening hearing loss, tinnitus (ringing in the ears) and a blocked-ear sensation as an uncommon immune-related adverse event, reported in case series and pharmacovigilance reviews. Published data on this specific reaction is more limited than for better-studied effects like colitis or thyroid problems, so any new hearing change during treatment is still evaluated promptly rather than assumed to be unrelated.
Is hearing loss from immunotherapy reversible?
It can be, especially when picked up and treated early. As with sudden sensorineural hearing loss from other causes, the chance of recovering hearing is highest when steroids and specialist care start within the first few days of symptoms appearing. Some patients recover fully, some partially, and a few do not recover the affected hearing — the outcome depends heavily on how quickly it is assessed, which is why oncology teams treat a same-day audiology or ENT referral as the priority, not a wait-and-watch approach.
When should hearing changes during immunotherapy be tested?
As soon as they are noticed — ideally with a hearing test (pure-tone audiometry) and an ENT or audiology assessment within 24 to 72 hours of a new hearing change starting. This mirrors the standard emergency timeline used for sudden sensorineural hearing loss generally, because the treatment window for the best chance of recovery is narrow. Call the CION helpline the same day a hearing symptom starts so an urgent referral can be arranged.
What other symptoms make hearing loss an emergency during immunotherapy?
Hearing loss that comes on suddenly, affects one ear only, or appears together with facial weakness or drooping, severe dizziness or vertigo, difficulty walking, slurred speech, or a severe new headache should be treated as a medical emergency — go to the nearest emergency room immediately. These combinations can point to a wider neurological immune reaction, not an isolated ear problem, and are assessed without delay.
Can immunotherapy cause tinnitus without actual hearing loss?
Yes. Some patients notice ringing, buzzing or a blocked-ear sensation without a measurable drop in hearing on testing. This is still worth reporting, since tinnitus can be an early warning sign of inner-ear or nerve involvement before hearing loss becomes measurable, and monitoring or an early audiogram can catch a problem sooner rather than later.
Will immunotherapy be stopped if I develop hearing loss?
It depends on how severe the reaction is and how you respond to initial treatment. Mild, stable tinnitus alone often allows immunotherapy to continue with closer monitoring, while confirmed, worsening or one-sided sudden hearing loss usually leads to pausing treatment and starting steroids under joint ENT and oncology review. Your tumour board decides whether and how immunotherapy resumes based on your specific case.