Cats shake their heads most often because something is irritating their ear canal. A quick, occasional shake after waking up or during a moment of excitement is normal behavior, but frequent or persistent head shaking almost always points to an ear problem that needs attention. The most common culprits are ear mites, bacterial or yeast infections, and allergies.
When Head Shaking Is Normal
Cats sometimes shake their heads briefly in response to emotions like excitement, anxiety, or surprise. You might notice it after your cat wakes up from a nap or gets startled by a sudden noise. This type of shaking is short-lived, happens only occasionally, and comes with no other symptoms. There’s no discharge, no odor, and no pawing at the ears. If that describes what you’re seeing, there’s likely nothing wrong.
The concern starts when head shaking becomes frequent, repetitive, or is paired with scratching at the ears, dark or smelly discharge, redness, or visible discomfort. That pattern points to one of several medical causes.
Ear Mites
Ear mites are one of the most common reasons cats shake their heads, especially in kittens and outdoor cats. These tiny parasites live inside the ear canal, feeding on skin debris and oils. They produce intense itching, which drives the head shaking and scratching. A telltale sign is dark, crumbly discharge that looks like coffee grounds.
The mites complete their life cycle in about three weeks, with females laying 15 to 20 eggs at a time on the surface of the ear canal. Those eggs hatch into larvae, then progress through two more stages before becoming adults. Because of this rapid reproduction, an untreated mite infestation gets worse quickly. One large study of nearly 700 cats found ear mites in about 25% of them, making this a very common diagnosis. A veterinarian can confirm mites by placing a sample of ear debris under a microscope at low magnification, where the mites and their eggs are clearly visible.
Ear Infections
Bacterial and yeast infections of the outer ear canal (called otitis externa) cause head shaking along with redness, swelling, odor, increased discharge, and scaly skin around the ear. The ear may be painful to the touch or intensely itchy, or both.
These infections often develop as a secondary problem. Something else, like allergies, mites, or a foreign object, creates inflammation first, and then bacteria or yeast overgrow in the warm, irritated environment. This is why treating only the infection without addressing the underlying cause tends to lead to recurrence. A vet will take an ear swab, roll it onto a slide, stain it, and examine it under high magnification to identify whether bacteria, yeast, or both are present, which determines the right treatment.
Allergies
Allergies are a major trigger for chronic ear inflammation in cats. Food allergies and environmental allergies (to things like pollen, dust mites, or mold) can both cause the ear canals to become inflamed and produce excess wax, setting the stage for secondary infections. If your cat has recurring ear problems despite treatment, allergies are a likely underlying cause. You may also notice itching or skin changes elsewhere on the body, particularly around the face and paws.
Ear Polyps
Inflammatory polyps are smooth, pink, stalk-like growths that develop inside the middle ear and can extend outward into the ear canal. They’re one of the more common masses found in cat ears. A large retrospective study found that polyps occurred most frequently in cats aged 2 to 7 years (about 53% of cases), though cats younger than one year accounted for roughly 21% of cases. In some cats, the polyp grows large enough to be visible without any special equipment, protruding right out of the ear canal.
Polyps cause head shaking, discharge, and sometimes difficulty breathing or swallowing if they grow toward the throat. They’re typically removed surgically, and recurrence is possible depending on how completely the base of the stalk is addressed.
Foreign Objects
Plant material, such as grass seeds or awns, can work its way into a cat’s ear canal and cause sudden, frantic head shaking. This is more common in outdoor cats and tends to come on abruptly rather than building gradually. If a foreign body is suspected, a vet will usually sedate the cat for a thorough examination, since the ear canal is narrow and the object may be deep enough that removing it while the cat is awake risks injury.
Vestibular Disease
Sometimes what looks like head shaking is actually a head tilt, or the shaking is accompanied by loss of balance, stumbling, walking in circles, or rapid eye movements. These signs point to vestibular disease, a problem with the inner ear’s balance system. In cats, this can result from a deep ear infection that has spread inward, or it can appear suddenly with no identifiable cause (called idiopathic vestibular disease).
Idiopathic vestibular disease comes on acutely with severe balance disruption but without facial drooping or other neurological signs. It typically resolves on its own within days to weeks. An inner ear infection causing vestibular symptoms, on the other hand, may also produce facial nerve paralysis on the affected side or changes in the eye (a drooping eyelid and constricted pupil). These cases need veterinary treatment, as the infection must be cleared to prevent permanent damage.
Less Common Causes
Autoimmune skin conditions can also affect the ears. Pemphigus foliaceus, the most common autoimmune skin disease in cats, produces crusty, flaky lesions that frequently appear on the ear flaps, nose, and around the eyes. About 65 to 80% of affected cats experience itching. The lesions are typically symmetrical, appearing on both ears rather than just one, which helps distinguish this from a simple infection.
What a Vet Visit Looks Like
If your cat is shaking its head persistently, the diagnostic process is straightforward. The vet will look inside the ear canals with a handheld otoscope, checking for redness, discharge, mites, polyps, or a foreign body. They’ll also check whether the eardrum is intact and visible. In many cases, a cotton swab sample of ear debris is collected and examined under a microscope to identify mites, bacteria, or yeast. This gives the vet a clear picture of what’s driving the problem.
For deeper issues, like suspected polyps, middle ear infections, or masses, CT imaging provides a detailed look at the structures beyond the eardrum that can’t be seen with a standard otoscope. Most straightforward ear problems, though, are diagnosed and treated in a single office visit.
One practical note: resist the urge to clean your cat’s ears with over-the-counter products before a vet visit. Cleaning can wash away the very discharge the vet needs to examine, and certain products can cause harm if the eardrum is already damaged.