Cat Ear Infection: Signs and When to See a Vet

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Urgent Neurological Signs: Immediate emergency veterinary care is critical for cats exhibiting inability to stand, constant severe head tilt, circling, rapid eye flickering, or vomiting concurrently with these signs, as these can indicate deep inner ear infections or neurological deficits.
• Diagnostic Cytology: Veterinarians utilize otoscopy to visualize the ear canal and eardrum, followed by cytology (microscopic examination of ear discharge) to differentiate between parasitic (ear mites), bacterial, and yeast etiologies, guiding appropriate treatment.
• Common Etiologies and Presentation: Ear mites are a frequent cause, characterized by dark, crumbly debris resembling coffee grounds and intense pruritus; bacterial and yeast infections often present with redness, swelling, pain, and purulent or malodorous discharge.
• Risk of Hematoma and Self-Trauma: Excessive head shaking and ear scratching due to irritation or infection can lead to aural hematomas, which are blood-filled swellings of the ear flap requiring surgical intervention, underscoring the importance of preventing self-trauma with Elizabethan collars.
• Home Care Limitations and Dangers: Owners should avoid inserting cotton swabs or using unprescribed home remedies (e.g., vinegar, olive oil) into the ear canal, as these can exacerbate inflammation, damage the eardrum, or interfere with veterinary diagnostics.
• Proactive Management Strategies: Weekly ear checks, prompt drying after bathing, managing underlying allergies, maintaining current parasite prevention, and reducing environmental stressors can significantly lower the recurrence rate of ear infections in susceptible cats.

If your cat is shaking its head, pawing at an ear, or holding one ear oddly, an ear problem is likely. Most ear infections in cats are treatable, but some can become serious quickly. You need to know which signs mean you can watch and wait, which mean call your vet today, and which mean go to an emergency vet now.

Go to an emergency vet immediately if your cat cannot stand, is tilting its head severely and constantly, is circling in one direction, has rapid eye flicking, or is vomiting with any of those signs. These can point to a deep inner ear infection or a neurological problem. Do not wait for a regular appointment. The American Veterinary Medical Association lists sudden collapse and severe disorientation as emergencies that need immediate care.

For everything else, read on. You will learn what an ear infection looks like, what else could be causing the signs, and exactly when to call your vet.

Is This an Emergency?

Use this table to decide your next step. When in doubt, call your vet. A phone call is free and can save you hours of worry.

{
 "type": "triage",
 "title": "Urgency triage by severity of signs",
 "tiers": [
  {
   "tier": "danger",
   "label": "Go to an emergency vet now",
   "signs": [
    "Cannot stand or walk normally, constant severe head tilt, circling in one direction, rapid back-and-forth eye movement, vomiting with any of these, seizure, unresponsive or very lethargic"
   ],
   "action": [
    "Call the emergency clinic on the way",
    "Do not wait for a regular appointment",
    "These signs can indicate inner ear disease or a brain problem"
   ]
  },
  {
   "tier": "warn",
   "label": "Book a same-day appointment",
   "signs": [
    "Head shaking more than a few times an hour, scratching at an ear until skin is raw, ear is red, swollen, or painful to touch, thick yellow, green, or bloody discharge, strong foul odor from the ear, ear flap is hot to the touch, your cat flinches or cries when you gently touch the ear base"
   ],
   "action": [
    "Call your regular vet when they open",
    "Describe the signs",
    "They will likely want to see your cat today"
   ]
  },
  {
   "tier": "safe",
   "label": "Watch at home for 24 to 48 hours",
   "signs": [
    "Mild head shaking once or twice a day, occasional scratching, small amount of dark brown or black waxy debris in the ear, no pain, no odor, no redness, and your cat is eating and acting normally"
   ],
   "action": [
    "Clean the visible outer ear gently with a cotton ball and a vet-approved ear cleaner only",
    "Do not use cotton swabs",
    "Do not put anything else in the ear"
   ]
  }
 ]
}

What Is Most Likely Going On?

The most common cause of ear trouble in cats is ear mites. These are tiny parasites that live inside the ear canal. They are highly contagious between cats but do not usually affect people. You often see their waste as dark brown or black crumbly debris that looks like coffee grounds. Ear mites cause intense itching, so a cat with mites will scratch and shake more than a cat with a bacterial infection.

Bacterial and yeast infections are the next most common cause. These often develop after something else damages the ear lining. Allergies, a foreign object like a grass seed, or a scratch can let bacteria or yeast overgrow. The ear becomes red, swollen, and painful. Discharge may be yellow, green, or bloody. A foul, sweet, or sour smell is common with these infections.

What Else Could It Be?

Not every ear problem is an infection. Polyps are non-cancerous growths that can form in a cat's ear canal or throat. They are more common in young cats. A polyp can cause head shaking, a visible mass in the ear, or a voice change if it grows near the throat. Polyps do not go away on their own and usually need surgical removal.

Foreign objects can also lodge in the ear. Grass awns, seeds, or small pieces of debris can get stuck deep in the canal. The cat shakes and scratches violently to try to dislodge it. This looks exactly like an infection but will not improve with ear drops.

Less common but serious causes include deep middle or inner ear infections. These can spread from the outer ear or travel up from the throat. They cause balance problems, head tilt, and sometimes facial nerve weakness, such as drooping on one side of the face. These require urgent veterinary care.

Why You Should Not Treat This at Home

You might be tempted to try home remedies. Do not. The underlying cause matters. Ear mite treatment is different from bacterial infection treatment, and both are different from polyp removal. Giving the wrong treatment can make things worse. For example, some cleaners and oils can irritate an already inflamed ear. Cotton swabs push debris deeper and can rupture the eardrum.

A veterinarian needs to look inside the ear with an otoscope, a tool with a light and magnifying lens. This examination shows whether the eardrum is intact. If the eardrum is torn, certain medications can cause deafness or severe dizziness. Only a vet can determine this. The MSD Veterinary Manual explains that proper diagnosis requires examining the ear canal and eardrum, and that treatment depends on the specific cause.

If your vet prescribes medication, they will give you the exact dose and how often to apply it. Never adjust the dose or frequency on your own. Dosing depends on your cat's weight, the severity of the infection, and the specific drug. Your vet determines all of these factors.

What to Expect at the Vet Visit

Your vet will start by asking when the signs began and whether your cat goes outside or lives with other pets. They will examine both ears, even if only one looks bad. They may take a swab of the ear discharge and look at it under a microscope. This test, called cytology, can show whether the problem is mites, bacteria, or yeast. This is quick and usually done in the clinic.

In some cases, your vet may recommend sedation to examine a painful ear thoroughly. They might also take X-rays or other images if they suspect a polyp or a deep infection. These steps help them choose the right treatment the first time.

Most ear infections improve within one to two weeks of proper treatment. The key is getting the right diagnosis early. A cat that keeps shaking its head can damage its ear flap, causing a hematoma, which is a blood-filled swelling that needs surgery. Do not wait for that to happen.

What You Can Safely Do at Home Right Now

If your cat is showing mild signs, there are a few things you can do while you arrange a veterinary appointment. These steps are for comfort and observation only. They do not treat the infection.

Keep the ear dry. Do not bathe your cat or let water enter the ear canal. Moisture makes infections worse. If your cat has long hair around the ears, you may gently wipe the outer flap with a dry, soft cloth. Do not push anything into the ear canal.

Stop your cat from scratching. A cat that shakes its head or paws at its ear can cause a hematoma, a blood-filled swelling of the ear flap that often requires surgery. If your cat is scratching, you can place an Elizabethan collar, also called an e-collar or cone, on them. Your vet can help you choose the right size. Do not wrap the head or ears tightly with bandages.

Do not clean the ear with anything. No vinegar, no alcohol, no hydrogen peroxide, no olive oil, no over-the-counter ear cleaners. These can sting, inflame the canal further, and change the appearance of the discharge your vet needs to see. Do not give any human pain medication. Many human drugs, including ibuprofen and acetaminophen, are toxic to cats. The ASPCA Animal Poison Control Center lists common household medications as a leading cause of pet poisoning, and some can be fatal even in small amounts.

Do not put any drops in the ear before the vet visit. The wrong product can make the problem worse, and it can interfere with the tests your vet needs to run.

What to Write Down Before You Call

A clear history helps your vet make a faster, more accurate plan. Before you call or visit, gather these details.

How long have the signs been present? Hours, days, or weeks. When did you first notice the shaking or scratching?

How often is the behavior happening? Count how many times in an hour your cat shakes its head or scratches at an ear. Write down the number.

What do you see? Look at both ears in good light. Note any redness, swelling, discharge, or dark debris. Is the discharge black and crumbly, yellow, or green? Does it have a smell? A yeasty or sour odor is common with infection. A foul, sweet, or musty smell can also occur.

Is your cat eating and drinking normally? Are they hiding, lethargic, or less playful than usual? Any change in appetite or energy matters.

Has your cat had ear problems before? If so, what treatment was used and did it help? Does your cat go outdoors? Do you have other pets, and do any of them have signs?

Symptom Checklist

Use this list to describe what you observe. Bring it with you to the appointment.

• Head shaking, more than a few times an hour
• Scratching at one or both ears
• Redness inside the ear flap or canal
• Swelling of the ear flap
• Dark brown or black debris that looks like coffee grounds
• Yellow, green, or gray discharge
• A bad smell coming from the ear
• Pain when the ear is touched
• Tilting the head to one side
• Walking in circles
• Loss of balance or falling over
• Squinting, blinking, or holding the ear flat against the head
• Decreased appetite or hiding

Triage Table

This table helps you decide how quickly to act. It is not a diagnosis. When in doubt, call your vet.

The American Veterinary Medical Association advises that signs like collapse, difficulty standing, or severe pain require immediate professional care. Do not wait to see if these improve.

What the Vet Visit Usually Involves

Your vet will start by asking the questions listed above. They will then examine both ears with an otoscope, a tool with a light and magnifying lens that lets them see the ear canal. This is usually painless, though a very sore ear may be uncomfortable.

Your vet will likely take a sample of the discharge on a cotton swab and look at it under a microscope. This test, called cytology, shows whether the problem is caused by bacteria, yeast, or ear mites. It takes only a few minutes and guides the choice of medication.

If the infection is severe, chronic, or does not respond to treatment, your vet may recommend further steps. These can include a culture to identify the exact bacteria, imaging such as X-rays or a CT scan, or sedation for a deeper examination. Polyps, which are benign growths in the ear canal, and foreign objects like grass seeds can cause repeated infections and may require removal.

The cost of a visit varies widely by region and clinic. A basic exam with cytology might range from roughly $80 to $250. Advanced imaging or surgical procedures cost considerably more. Ask your vet for an estimate before any test or procedure. The American Animal Hospital Association recommends discussing costs openly with your veterinary team so you can make informed decisions.

When an Online Vet Can Help, and When It Cannot

Any situation in the emergency rows of the triage table above requires hands-on care. A head tilt, circling, loss of balance, a swollen ear flap, or a cat that is lethargic and not eating cannot be managed remotely. These signs can indicate inner ear disease, a hematoma, or a severe infection that may spread. You must go to an emergency clinic in person.

A remote consultation can be genuinely useful for other situations. If your cat has mild head shaking with no redness or discharge, an online vet can help you decide whether a visit is needed. If your cat is on treatment for a known ear problem and you have a question about a side effect or whether the signs are improving, a video call can be a good first step. For a chronic condition that your vet already manages, a remote recheck can save a trip.

A remote vet can take a history, watch your cat shake its head on video, look at the outer ear, and give advice. In many states they can also prescribe medication. But they cannot feel the ear canal, take a temperature, look deep inside with an otoscope, run cytology, or image the skull. Prescribing rules differ by state, and a veterinarian may require an in-person examination before prescribing. If a remote vet advises that your cat needs hands-on care, take that advice seriously and book the visit.

Common Mistakes Owners Make With Ear Problems

Many well-meaning owners make the same errors when their cat has an ear issue. Knowing these can save your cat pain and save you money.

Mistake: Cleaning too deeply. Cotton swabs push debris and infection further into the ear canal. This can damage the eardrum. Never insert anything into the ear canal. Clean only what you can see on the outer flap with a soft, damp cloth.

Mistake: Using leftover medication. Ear drops from a previous infection may be expired, the wrong type, or the wrong strength. Using them can mask the real problem or cause resistance. Throw away old medications.

Mistake: Stopping treatment early. The ear looks better, so you stop the drops. The infection returns, often worse. Finish the entire course your veterinarian prescribed, even if the ear looks normal.

Mistake: Assuming it is ear mites. Ear mites are common in kittens, but adult cats more often have bacterial or yeast infections. Treating for mites when the cause is bacterial wastes time and lets the infection spread.

Mistake: Waiting to see if it clears. Ear problems rarely resolve on their own. A small infection can become a deep middle ear infection that requires surgery. Early treatment is simpler and cheaper.

How to Reduce the Chance of It Happening Again

Some cats are prone to ear problems, but you can lower the risk.

Check ears weekly. Look at the outer ear and the opening of the canal. Healthy ears are pale pink, dry, and odorless. Write down any redness, dark wax, or smell.

Dry ears after baths. Moisture feeds yeast. If your cat gets wet, dry the outer ear gently with a soft towel. Never use a hair dryer near the head.

Control allergies. Many chronic ear infections trace back to food or environmental allergies. If your cat has recurring ear trouble, ask your vet about an allergy workup. Managing the allergy often stops the ear infections.

Keep parasite prevention current. Fleas and mites can trigger ear inflammation. Use the preventive products your vet recommends, and give them on schedule.

Reduce stress. Stress lowers immune function. Provide hiding spots, vertical space, and a consistent routine. A calm cat fights off infections better.

What Recovery and Ongoing Management Look Like

Most uncomplicated ear infections improve within 7 to 14 days of treatment. You should see less head shaking and a cleaner ear within 48 to 72 hours. If there is no improvement after three days, call your vet.

Your vet will likely schedule a recheck. This is not optional. The ear canal must be examined again to confirm the infection is gone. Some infections need a second round of treatment.

Chronic cases take longer. Cats with allergies, polyps, or narrow ear canals may need months of management. Your vet might recommend regular ear cleanings with a prescription solution, dietary changes, or anti-inflammatory medication. Dosing for any medication must come from your treating veterinarian, because the correct amount depends on your cat's weight, the specific drug, and the severity of the disease.

If your cat had a polyp removed, recovery usually takes two to four weeks. Your cat may need pain relief and a soft diet during that time. Follow your vet's instructions for activity restrictions.

Watch for signs that treatment is failing. Increased head shaking, a tilted head, loss of balance, or redness spreading to the face mean you need to call your vet immediately. These can indicate the infection has moved deeper. The American Veterinary Medical Association lists sudden changes in balance or coordination as signs that warrant urgent professional care.

Frequently Asked Questions

Can I use olive oil or vinegar in my cat's ear?

No. Home remedies like vinegar, olive oil, or alcohol can burn inflamed tissue and make the infection worse. They also change the ear's pH, which can encourage yeast growth. If the eardrum is already damaged, any liquid you pour in can reach the middle ear and cause severe pain or permanent balance problems. Use only products your veterinarian prescribes or explicitly recommends.

My cat shook its head once and now seems fine. Should I still worry?

A single head shake is normal. Watch for a pattern. If your cat shakes its head more than a few times a day, scratches at one ear, or holds the ear oddly, there is likely a problem. Ear infections do not resolve on their own. Early signs are easier and cheaper to treat, so a vet visit is the safer choice.

How much does ear infection treatment cost?

Costs vary widely by region and clinic. A basic exam runs roughly 50 to 150 dollars. Ear cytology, where a vet looks at ear discharge under a microscope, adds about 30 to 80 dollars. Medications typically cost 20 to 60 dollars. Severe cases needing sedation, imaging, or surgery cost much more. Ask your clinic for an estimate before treatment begins.

Can ear infections cause deafness?

Yes, but usually temporarily. Swelling, discharge, and wax block sound transmission. Once the infection clears, hearing typically returns. Permanent deafness is rare but possible with severe, chronic infections that damage the eardrum or middle ear structures. This is another reason to treat ear problems promptly instead of waiting.

Is it safe to use over-the-counter ear cleaners?

Only if your veterinarian approves the specific product. Many commercial cleaners are safe for healthy ears but sting on inflamed ones. Some contain ingredients that are toxic if the eardrum is ruptured. Your vet can tell you whether a cleaner is appropriate and how often to use it. Never use a cleaner meant for dogs on a cat.

My cat hates the ear drops. What can I do?

Warm the bottle in your hands for a minute before giving it. Cold liquid startles cats. Wrap your cat in a towel so only the head is exposed. Give the drops from behind, not from the front, so your cat cannot see the bottle coming. Follow each dose with a treat. If your cat still fights, ask your vet about a different medication form, such as an injection or an oral medication.

Related Clinical & Scientific Guides

• Dog Coughing: When Is It an Emergency?
• My Dog Ate a CBD Gummy: What Should I Do?
• Cat Vomiting After Eating Too Fast: When to Slow Down and When to Call

References and Further Reading

• AVMA Emergency Care for Pets
• ASPCA Animal Poison Control Center
• AVMA Pet Owner Resources
• MSD Veterinary Manual Pet Owner Version
• AAHA Pet Owner Resources

Related Articles

• Cat Limping: When to See a Vet and When to Monitor
• Cat Meowing Excessively: When to See a Vet
• Cat Bad Breath and Drooling: When to See the Vet
• Cat Scooting: Causes and When to Call the Vet
• Cat Sneezing and Nasal Discharge: When to See a Vet

This article is general educational information for pet owners. It is not a substitute for veterinary diagnosis, examination, or treatment. If your pet is showing severe or rapidly worsening signs, contact an emergency veterinary hospital immediately.