Signs of Ear Infection in Cats: Symptoms and Red Flags
A vet-reviewed guide to signs of ear infection in cats, discharge and odor patterns, subtle pain behavior, and head tilt or balance changes that need urgent care.
BVMS MRCVS
Medically reviewed by Dr. Pippa Elliott, BVMS MRCVS · Last reviewed
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The most common signs of ear infection in cats are head shaking, repeated scratching, redness, odor, unusual discharge, swelling, and pain when the ear or head is touched. Cats may also hide, resist handling, groom less, or eat less because opening the jaw and moving the head hurts.
Discharge color cannot confirm whether the cause is yeast, bacteria, mites, a polyp, or another problem. A veterinary exam, otoscopy, and ear cytology provide the safest answer. Head tilt with falling, rapid eye movements, facial droop, or inability to walk normally is urgent because middle- or inner-ear disease may affect balance, hearing, and facial nerves.
- 1Repeated head shaking, scratching, odor, redness, discharge, and pain are common outer-ear signs.
- 2A cat may show pain through hiding, irritability, appetite change, or avoiding touch.
- 3Dark debris can occur with mites or infection; pus-like discharge does not identify the organism.
- 4Balance loss, rapid eye movements, facial weakness, or severe head tilt needs prompt veterinary care.
- 5One-sided, recurring signs can point to a foreign object, polyp, mass, or deeper disease.
Common Signs of Ear Infection in Cats
Otitis externa is inflammation of the outer ear canal. The Merck Veterinary Manual’s feline otitis externa guide lists head shaking, odor, redness, swelling, scratching, increased discharge, and scaly skin among the common signs. One or both ears may be affected, and symptoms may be sudden or chronic.
The discharge and odor visual guide begins with behavior because many cats show pain before material is visible. Use the table to organize what you see, then let veterinary diagnosis determine the cause.
| Sign | What an owner may notice | What it can mean | Recommended response |
|---|---|---|---|
| Head shaking | Repeated sharp shakes or holding one ear low | Itching, pain, mites, inflammation, foreign material | Arrange an ear exam if persistent or paired with debris or pain |
| Scratching | Pawing at ear, scabs, hair loss | Itch or pain; self-trauma can worsen swelling | Prevent further injury and schedule care |
| Odor | Musty, sour, foul, or simply different | Microbial overgrowth or trapped discharge | Do not diagnose yeast by smell; cytology is needed |
| Discharge | Brown, black, yellow, green, waxy, bloody, or pus-like | Mites, yeast, bacteria, inflammation, or tissue damage | Veterinary examination, especially if painful or foul smelling |
| Redness and swelling | Warm canal opening, thickened tissue | Active inflammation | Prompt exam before the canal becomes obstructed |
| Pain | Flinching, crying, biting, avoiding head touch | Significant inflammation or deeper disease | Do not force cleaning; seek care |
| Behavior change | Hiding, irritability, reduced grooming or appetite | Pain or illness | Treat as a clinical sign, not bad behavior |
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Head shaking and scratching
An occasional scratch is normal. A pattern of repeated scratching, vigorous head shaking, or rubbing the head against furniture suggests persistent discomfort. Scratching can tear skin around the ear and create an aural hematoma, a blood-filled swelling in the ear flap.
The frequency is less important than the combination. One shake after waking is different from shaking every few minutes with odor and debris. Record when it began and which side seems affected, but do not delay care to collect a long diary.
The older WebVet article about why cats scratch their ears owns the broad differential among mites, allergy, wax, infection, and polyps. It remains unchanged. This page focuses narrowly on infection symptoms and triage.
Redness, warmth, and swelling
Inflamed tissue may look pink to deep red, feel warmer, and become thickened. The canal opening can narrow as swelling progresses, trapping discharge and making topical medicine harder to distribute. Ulcers or raw tissue suggest severe irritation and can be extremely painful.
Do not pull hard on the ear flap or insert a light, swab, or camera attachment into the canal. A painful cat may move suddenly, and the eardrum lies beyond an L-shaped canal that is not safe to explore at home.
Pain and behavior changes
Cats hide pain. A cat with ear disease may stop sleeping on one side, duck away from petting, avoid grooming the head, resist a collar, or become irritable when another pet approaches. Some cats eat more slowly because jaw movement hurts. Others withdraw or stop playing.
Pain does not reliably tell you whether disease is outer, middle, or inner ear. Severe pain, pain opening the mouth, or persistent pain after treatment can increase concern for deeper involvement.
What Cat Ear Infection Discharge Looks and Smells Like
Discharge descriptions are clues, not diagnoses. Ear mites, yeast, bacteria, blood, wax, and inflammatory fluid can mix. Previous drops or cleaners also change appearance.
The outer versus inner ear emergency table in this section separates visible canal clues from balance, eye, and facial signs. It is a triage tool, not a substitute for veterinary diagnosis.
| Appearance or odor | Possible explanation | Important limitation |
|---|---|---|
| Dry, dark, coffee-ground debris | Ear mites are possible | Yeast, wax, blood, and mixed disease can look similar |
| Brown or tan waxy material | Yeast, wax buildup, or inflammation | Color alone cannot establish Malassezia overgrowth |
| Yellow or green discharge | Bacteria and inflammatory cells may be present | Cytology and sometimes culture guide treatment |
| Black greasy debris | Yeast, mites, oxidized wax, mixed disease | A microscope is needed to separate causes |
| Blood or bloody crust | Self-trauma, ulceration, foreign material, mass | Needs prompt examination, especially if recurrent or one sided |
| Strong musty or foul odor | Microbial overgrowth and trapped debris | Yeast and bacteria can both smell abnormal |
| Clear fluid with neurologic signs | Deeper disease or another serious problem | Seek urgent care rather than attempting cleaning |
Why smell is not a yeast test
A musty odor is often associated with yeast in popular advice, but bacteria and mixed infection also create odor. Malassezia can be found in healthy ears in small numbers. The diagnosis depends on cytology findings, organism burden, inflammation, and the cat’s signs.
The dedicated cat yeast ear infection guide explains Malassezia biology, mixed infections, and antifungal treatment. Owners should not use yeast cream or select an antifungal based on smell.
Why dark debris is not automatically mites
Ear mites commonly produce dark, dry debris, especially in kittens and exposed cats. However, secondary yeast or bacterial overgrowth may be present, and wax can look similar. A mite examination and cytology help the veterinarian treat every component.
Do not put oil into the ear to “smother” mites. It may obscure examination, trap debris, and fail to clear all life stages. The fixed WebVet guide to cat ear mites or fleas is the appropriate owner for broad parasite identification.
One ear versus both ears
Disease in both ears may fit parasites, allergy, or a widespread skin problem, although any cause can be uneven. Persistent disease in one ear raises the importance of a foreign object, inflammatory polyp, tumor, localized canal change, or middle-ear disease.
One-sided bleeding, tissue growth, airway noise, swallowing changes, or repeated relapse deserves a thorough workup. Medicine can reduce secondary infection without removing an obstructive cause.
Pus, crusts, and wounds from scratching
Pus-like material suggests substantial inflammation and may contain bacteria, but only cytology can identify the microbial pattern. Crusts on the ear flap can come from dried discharge or self-trauma. A cat that repeatedly rakes the ear with a hind foot can create raw skin even when the original disease is confined to the canal.
Do not peel crusts or wash wounds with peroxide. Prevent further injury as advised by the clinic and arrange prompt examination. An aural hematoma can develop when forceful shaking or scratching ruptures small vessels inside the ear flap, creating a soft or tense swelling that also needs veterinary care.
Emergency Signs: Head Tilt, Balance Changes, and Severe Pain
The middle and inner ear sit close to structures that control balance, hearing, eye movement, and facial function. The Merck Veterinary Manual guide to feline otitis media and interna notes that affected cats may develop head tilt, poor coordination, difficulty rising or walking, and side-to-side eye movements.
Seek urgent veterinary care for:
- a new head tilt accompanied by falling or circling
- stumbling, rolling, or inability to stand
- rapid horizontal or rotary eye movements, called nystagmus
- facial droop, inability to blink, a small pupil, or a prominent third eyelid on one side
- severe pain, crying, collapse, or inability to eat
- sudden hearing change or failure to respond normally
- pus, blood, major swelling, or rapid worsening
- neurologic signs after an ear product was applied
Head tilt without falling
A mild head tilt can occur with pain, but it can also be an early sign of middle- or inner-ear disease. Contact a veterinarian the same day, particularly when the tilt is new, persistent, or paired with abnormal eye movement, facial change, or poor balance.
Facial nerve and eye changes
The facial nerve passes near the middle ear. Inflammation can cause a drooping lip or ear, reduced blink, and exposure of the eye surface. Other nearby nerve effects can create a small pupil, drooping eyelid, sunken eye, or prominent third eyelid. Eye protection may be needed if blinking is impaired.
Changes in hearing and orientation
A cat with ear pain may simply ignore a sound, so apparent hearing loss is difficult to judge at home. More concerning patterns include failing to orient toward familiar sounds, startling when approached from one side, vocalizing differently, or becoming hesitant in dim spaces.
Do not clap, shout, or create sudden loud noises to test hearing.
Hearing changes combined with head tilt, eye movement, or poor coordination increase concern for deeper ear involvement. Even if the cat remains able to walk, call the veterinarian promptly because early evaluation provides the best opportunity to identify treatable disease.
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Appetite and grooming changes
Reduced appetite can reflect pain when opening the jaw, nausea from vestibular disease, stress, or broader illness. Uneaten meals are more urgent in cats than in many other species because prolonged inadequate intake can create additional health risks. Contact the clinic if appetite drops, especially when paired with vomiting, lethargy, balance change, or facial weakness.
Reduced grooming around the head may leave the coat greasy or uneven. Overgrooming elsewhere may point toward allergy. These whole-cat changes help distinguish a brief itch from clinically significant ear disease.
How Vets Confirm the Cause
The veterinarian combines history, examination, otoscopy, and cytology. Otoscopy can reveal swelling, foreign material, mites, polyps, abnormal tissue, and eardrum changes. A painful or obstructed canal may require sedation to examine safely.
Cytology shows yeast, cocci, rods, and inflammatory cells. Mites or eggs may be found by direct examination or microscopy. Culture may be recommended for rod-shaped bacteria, severe recurrence, or treatment failure. CT or MRI can help evaluate the middle ear, a polyp, or a mass.
The WebVet cat ear infection overview owns causes, diagnostic logic, and prevention. The cat ear infection treatment page owns medication, cleaning, recovery, and cost. This symptoms page should get the reader to the right level of care without prescribing from appearance.
What to Do While Waiting for the Appointment
Keep the cat indoors and prevent rough play that could worsen balance or self-trauma. Use a recovery collar only if the veterinarian recommends one and the cat can eat, drink, see, and move safely in it. Photograph visible discharge or swelling once if that helps document change, but do not repeatedly manipulate the ear.
Do not insert cotton swabs, flush the canal, use hydrogen peroxide or vinegar, apply essential oils, or give leftover medicine. If a clinician has already prescribed a product for this episode, follow those instructions and report any worsening signs.
The guide to safe limits for cat ear infection home care explains what owners can and cannot do before diagnosis.
Reading the Symptom Pattern
A single sign is less informative than location, timing, severity, and recurrence. Bringing that pattern to the appointment helps the veterinarian prioritize the exam without asking the owner to make a diagnosis.
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Sudden onset
Signs that begin within hours can occur with a foreign object, trauma, a ruptured surface lesion, or a sudden inflammatory flare. A cat may shake violently, hold one ear down, and resist touch. Mites and infection can also become noticeable suddenly even when the underlying process has been developing longer.
Sudden severe pain deserves prompt evaluation. Do not attempt to retrieve an object with tweezers. Material pushed deeper can damage the canal or eardrum, and a struggling cat may be injured.
Gradual worsening
Slowly increasing wax, odor, scratching, and redness may fit chronic outer-ear inflammation, allergy, yeast, bacteria, or mites. Cats often adapt, so the owner may first notice behavior changes rather than dramatic ear signs. Compare both visible ear openings in normal light without inserting anything.
Gradual does not mean harmless. Chronic inflammation can thicken and narrow the canal, trap medication and debris, and support repeated overgrowth.
Improvement followed by relapse
Relapse after drops can mean treatment stopped before microscopic resolution, the wrong organism was targeted, the medication did not reach the canal, mites returned from a contact animal, or the primary cause was never controlled. A hidden polyp or middle-ear source can also sustain one-sided disease.
Tell the veterinarian the exact product, dose, frequency, and dates used. A photo of the label is more useful than remembering that it was “an ear medicine.” Do not restart leftovers before cytology unless the clinic directs you to do so.
One-sided recurrence
Repeated inflammation in the same ear increases concern for localized disease. Polyps, foreign material, masses, canal narrowing, and middle-ear infection may not respond permanently to topical medication. Otoscopy, imaging, or biopsy may be needed even when a previous course reduced odor and discharge.
Both ears plus skin signs
Inflammation in both ears with facial itching, neck sores, overgrooming, paw licking, or recurrent skin lesions can point toward allergy or broader dermatologic disease. Mites also commonly affect both ears but may be uneven. Cytology and parasite evaluation identify the active ear problem while the broader examination looks for the trigger.
| Pattern | Questions to record | Why it helps |
|---|---|---|
| Sudden and one sided | Was the cat outdoors, grooming, playing, or exposed to a product? | Raises foreign material, trauma, or acute flare in the differential |
| Gradual in both ears | Is there itching elsewhere or a new pet exposure? | Supports investigation of allergy, mites, or generalized skin disease |
| Same ear repeatedly | Did it ever fully clear on recheck? | Raises structural or middle-ear concerns |
| Worse after a product | What exact product, dose, and time was used? | Helps assess irritation, toxicity, or eardrum risk |
| Neurologic signs | When did tilt, falling, eye movement, or facial change begin? | Guides urgency and deeper-ear evaluation |
Preparing for the Veterinary Visit
Avoid cleaning the ear for at least the interval the clinic requests because fresh samples can improve cytology. If you already cleaned it, say when and what you used. Bring all current medications and supplements, including nonprescription products.
Record which ear is involved, when symptoms began, whether they are worsening, appetite and activity changes, exposure to new animals, and any history of allergy or previous otitis.
A short video of intermittent head tilt, abnormal eye movement, or balance trouble can help if it is safe to record, but urgent signs should never wait for documentation.
Transport a painful or dizzy cat in a secure carrier. Line it with towels, keep it level, and cover part of it to reduce visual stimulation. Warn the clinic about bite risk or severe handling distress so the team can plan low-stress restraint, pain control, or sedation.
How Do Indoor Cats Get Bacterial Ear Infections?
Indoor cats can develop bacterial otitis without outdoor exposure. Bacteria may overgrow after allergy, mites introduced by another animal, excess wax, scratching, a polyp, foreign material, or chronic canal inflammation disrupts normal defenses. A previous partially treated infection or deeper ear disease can also contribute.
The key is not where the bacteria came from, but why they multiplied. Cytology identifies bacterial forms, and the examination searches for the primary trigger. A recurring bacterial infection in the same ear should prompt renewed investigation rather than automatic reuse of the same drops.
Frequently Asked Questions About Signs of Ear Infection in Cats
Frequently Asked Questions
How do indoor cats get bacterial ear infections?
Indoor cats can have allergy, mites introduced by a new or visiting animal, excess wax, polyps, foreign material, canal trauma, or deeper ear disease. These factors damage normal defenses and allow bacteria to overgrow. Cytology confirms bacteria, while the exam looks for the trigger.
What is the first sign of a cat ear infection?
Early signs may be repeated scratching, head shaking, a new odor, redness, or avoiding touch near one ear. Any persistent pattern or combination deserves an exam because cats often hide pain.
What color is cat ear infection discharge?
It may be brown, black, yellow, green, bloody, waxy, or pus-like. Color does not identify the cause. Mites, yeast, bacteria, blood, and wax can overlap or occur together.
Is head tilt always an emergency?
A head tilt alone warrants prompt same-day advice. Head tilt with falling, circling, rapid eye movements, facial changes, or inability to walk is urgent because middle- or inner-ear disease may be involved.
Can a cat have an ear infection without discharge?
Yes. Early inflammation, deeper disease, or an obstructed canal may cause pain, head shaking, balance change, or behavior change without obvious material at the opening.
Can I smell my cat’s ear to diagnose yeast?
No. Yeast and bacteria can both produce odor, and mixed infection is possible. Cytology is the appropriate diagnostic test.
The Bottom Line
Signs of ear infection in cats include scratching, head shaking, redness, odor, discharge, pain, and subtle behavior change. Appearance helps with triage but cannot select treatment.
Seek urgent care for balance loss, rapid eye movements, facial weakness, severe head tilt, or inability to walk, and arrange a veterinary exam for any painful, smelly, or draining ear.
Sources
Editor
The Webvet Editorial Team is the in-house group of pet-care editors and writers behind Webvet, operated by Smart Pet Collective. The team researches, writes, and maintains Webvet's pet health, behavior, and medication content. Every article follows a defined editorial process: research from reputable veterinary and scientific sources, careful drafting, mandatory review of medical content by a credentialed veterinarian, and dated publication. Health and medication articles are medically reviewed by a licensed veterinary professional before they go live and are kept current over time.
Veterinarian · BVMS MRCVS
Dr. Pippa Elliott, BVMS, MRCVS, is a veterinarian with nearly 30 years of experience in companion animal practice. Dr. Elliott earned her Bachelor of Veterinary Medicine and Surgery from the University of Glasgow. She was also designated a Member of the Royal College of Veterinary Surgeons. Married with 2 grown-up kids, Dr. Elliott has a naughty Puggle named Poggle, 3 cats and a bearded dragon.
