# Cat Ear Infections: Signs, Causes, and When to See a Vet **URL:** \ **Category:** Cat Health and Nutrition\ **Tags:** featured\ **Created:** [July 16, 2026, 2:06am UTC](https://forum.oscillotamerica.com/t/cat-ear-infections-signs-causes-and-when-to-see-a-vet/3515 "2026-07-16T02:06:24Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![CatLady6](https://forum.oscillotamerica.com/user_avatar/forum.oscillotamerica.com/catlady6/32/597_2.png) [@CatLady6](https://forum.oscillotamerica.com/u/CatLady6)\ **Post date:** [July 16, 2026, 2:06am UTC](https://forum.oscillotamerica.com/t/cat-ear-infections-signs-causes-and-when-to-see-a-vet/3515/1 "2026-07-16T02:06:24Z")
![Cat Ear Infections: Signs, Causes, and When to See a Vet](https://forum.oscillotamerica.com/uploads/default/original/1X/e5e2b1f66026f6ad861913fb321116ba9a057ae3.jpeg) Ear infections in cats usually show up as head shaking, scratching at one ear, and a smell you notice before you see anything. Unlike ear mites — which are a contagious parasite — most cat ear infections are caused by bacteria or yeast that overgrow when something else (allergies, moisture, a polyp) disrupts the normal balance in the ear canal. The fix depends entirely on which one it is, which is why a vet visit with an otoscope and ear cytology, not a guess, is the right first step. ## Ear Infection vs. Ear Mites: Not the Same Problem These get confused constantly because the symptoms overlap — head shaking, dark discharge, a cat pawing at their ear. But they’re different problems with different fixes. **Ear mites** (_Otodectes cynotis_) are a surface-dwelling parasite, highly contagious between pets, and produce a dry, coffee-ground-like discharge. We covered them in detail in [Ear Mites in Cats: Symptoms, Diagnosis, and Treatment](https://forum.oscillotamerica.com/t/3512) — worth reading if you have multiple pets, since mites spread fast between them. **Bacterial or yeast infections (otitis externa)** are usually secondary — something else changed the environment in the ear canal enough for normal microbes to overgrow. The discharge tends to be waxier, darker brown or yellow, and often has a distinct sour or yeasty odor mites don’t produce. Cats can also get both at once, since chronic mite irritation can pave the way for a secondary bacterial infection. A vet distinguishes the two in minutes with an otoscope exam and a cytology swab — looking at ear debris under a microscope. Guessing at home wastes time and, with the wrong over-the-counter product, can make things worse. ## What Causes Ear Infections in Cats Unlike dogs — where ear infections are extremely common and often tied to floppy ears or swimming — they’re less frequent in cats, which is actually a useful clue: when a cat does get one, there’s often an underlying reason worth finding. The American Association of Feline Practitioners and Cornell Feline Health Center both point to a similar list of contributors: - **Allergies** (environmental or food) — inflamed ear canals from allergic skin disease are one of the most common underlying drivers of recurring feline ear infections. - **Polyps** — benign growths (nasopharyngeal polyps) that develop in the middle ear, more common in young cats, and can cause chronic one-sided ear symptoms. - **Moisture or trauma** — from bathing, scratching, or a foreign body like a grass seed lodged in the canal. - **Underlying skin conditions** — cats with generalized dermatologic issues are more prone to ear canal inflammation as part of the same process. - **Immune-suppressing illness** — cats with FIV or FeLV can be more prone to chronic or recurrent infections because their immune system has a harder time controlling normal ear flora. This is the main reason vets treat a first-time ear infection differently from a fourth one in the same year — a single infection gets treated and monitored, but a pattern of recurrence means it’s time to look for what’s driving it. ## Symptoms to Watch For - Head shaking or tilting - Scratching at one or both ears - Dark discharge — brown, yellow, or waxy (versus mites’ dry, crumbly, dark debris) - A noticeable odor from the ear - Redness or swelling visible inside the ear flap - Sensitivity or pain when the ear is touched - In severe or long-standing cases: a head tilt that persists even when the cat isn’t shaking it, which can indicate the inner ear is involved Cats are also good at hiding pain, so a mild infection can go unnoticed longer than in dogs. If your cat seems “off” — less interested in being petted near the head, sleeping oddly to keep one ear down — that’s worth a look even without obvious scratching. ## How Vets Diagnose and Treat Ear Infections Diagnosis starts with an otoscope exam to check the eardrum is intact (important — some medications shouldn’t be used if it’s ruptured) and a cytology sample to identify whether bacteria, yeast, or both are present. Treatment is targeted to what’s actually growing: - **Yeast infections** typically respond to antifungal ear drops within one to two weeks. - **Bacterial infections** need a prescription antibiotic drop or ointment matched to the organism found on cytology — broad topical treatment without a diagnosis risks resistance and recurrence. - **Polyps** usually require a vet to remove them, sometimes surgically, since ear medication alone won’t resolve the underlying growth. - **Allergy-driven cases** need the allergy itself managed — otherwise the ear infection just comes back once the drops stop. A full course typically runs 10–14 days, and it’s worth finishing it even after symptoms look resolved — stopping early is one of the most common reasons infections return within a few weeks. ## When to See a Vet Book an appointment if you notice: - Any discharge, odor, or redness in the ear - Repeated head shaking or scratching at one ear - A head tilt, especially one that doesn’t go away between shakes - Visible pain when the ear area is touched - A third ear infection within a year — that’s a signal to investigate an underlying cause, not just treat the symptom again Go same-day if there’s a sudden head tilt combined with loss of balance, circling, or abnormal eye movements — these can indicate the infection has reached the inner ear or, less commonly, a separate neurological issue, and both need prompt evaluation. ## The Takeaway A cat pawing at one ear isn’t automatically mites, and it isn’t something to wait out. Get the ear looked at and swabbed before starting any treatment — matching the drops to what’s actually growing is the difference between clearing it in a week and dealing with it for months. If you’re not sure your current vet is a good fit for follow-up care like this, [How to Find a Good Vet](https://forum.oscillotamerica.com/t/3471) covers what to look for.