Seizures in Cats: Causes, What to Do & Treatment

A seizure is a sudden burst of abnormal electrical activity in the brain. In cats, that can cause dramatic full-body convulsions, but it can also look much subtler. Some cats drool, stare, fall over, paddle their legs, twitch their face, or seem briefly confused rather than having obvious whole-body shaking.

Seizures are a symptom, not a diagnosis. That matters because the underlying cause can range from a one-time toxin exposure to metabolic disease, high blood pressure, infection, head trauma, or a brain tumor. Idiopathic epilepsy, where no cause is found, does happen in cats, but it is considered less common than in dogs.

Many cats go through three phases. Before the seizure, they may seem restless, clingy, or odd. During the event, they may lose awareness, twitch, stiffen, paddle, vocalize, urinate, or drool. Afterward, they can be disoriented, hungry, wobbly, temporarily blind, or very tired for minutes to hours.

Because seizures can be linked to serious disease, any first seizure deserves prompt veterinary attention. If the seizure lasts more than 5 minutes or your cat has multiple seizures close together, it is an emergency.

Seizures in cats usually fall into two broad categories: brain-related causes and body-wide causes that affect the brain. Brain-related causes include inflammation of the brain, infections such as cryptococcosis or toxoplasmosis, congenital abnormalities, prior head trauma, strokes or vascular events, and brain tumors. In older cats, structural brain disease becomes a bigger concern.

Body-wide causes are also common and often need to be ruled out first. These include low blood sugar, liver disease with hepatic encephalopathy, kidney disease, electrolyte imbalances, severe high blood pressure, heatstroke, and some endocrine disorders. Toxin exposure is another important possibility, especially with human medications, recreational drugs, rodenticides, and other household hazards.

Cats can also have more subtle focal seizures. These may show up as facial twitching, sudden chewing motions, staring, or odd repetitive behavior. Some cats develop sound-triggered seizures, called feline audiogenic reflex seizures, where specific noises can trigger episodes.

Sometimes, even after a thorough workup, no clear cause is found. Your vet may then use terms like idiopathic epilepsy or epilepsy of unknown cause. In cats, that diagnosis is usually made only after other medical and neurologic causes have been investigated.

Diagnosis starts with a careful history. Your vet will want to know what the episode looked like, how long it lasted, whether your cat was normal afterward, and whether there was any possible exposure to toxins, trauma, new medications, or unusual foods. If you can safely record a video, that can be very helpful because many abnormal episodes are over before the exam begins.

Initial testing often includes a physical exam, neurologic exam, bloodwork, urinalysis, and blood pressure measurement. These tests help look for common triggers such as low blood sugar, liver disease, kidney disease, electrolyte problems, infection, or hypertension. Depending on your cat’s age and symptoms, your vet may also recommend thyroid testing, infectious disease testing, chest imaging, or abdominal ultrasound.

If basic testing does not explain the seizures, advanced diagnostics may be the next step. These can include MRI or CT imaging of the brain and cerebrospinal fluid testing to look for inflammation, infection, or cancer. Cats with repeated seizures may also need anticonvulsant blood-level monitoring after treatment starts.

The goal is not only to confirm that a seizure happened, but to identify the reason behind it. That is what guides treatment options and helps your vet give you a more accurate outlook.

Not every seizure can be prevented, because many are caused by diseases that develop inside the body or brain. Still, there are practical steps that may lower risk or help catch problems earlier. Keep toxic plants, rodenticides, recreational drugs, and human medications securely out of reach. If your cat has diabetes, liver disease, kidney disease, or high blood pressure, staying current with monitoring can help reduce seizure triggers tied to those conditions.

If your cat has already had a seizure, prevention focuses on reducing repeat episodes and keeping your cat safe. Give medications exactly as prescribed, do not stop anticonvulsants suddenly unless your vet tells you to, and keep follow-up appointments for lab work and dose checks. Missing doses can make seizure control harder.

A seizure diary can make a real difference. Write down the date, time, length, what the seizure looked like, possible triggers, and how your cat acted afterward. Video is helpful when it can be taken safely. This gives your vet better information to decide whether treatment is working or whether the plan needs to change.

For cats with known sound-triggered seizures, reducing exposure to specific noises may help. More broadly, regular wellness visits, blood pressure checks in at-risk senior cats, and early evaluation of behavior changes, wobbliness, or vision changes can sometimes identify the underlying problem before seizures become more severe.