Seizures in Cats: Causes, Symptoms, and What to Do

Name: Seizures in Cats: Causes, Symptoms, and What to Do
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

Watching your cat seize is frightening, and the first question most owners ask is simple: what causes cat seizures? The answer depends a lot on your cat's age, because young kittens, adult cats, and senior cats tend to seize for different reasons. Most seizures in cats fall into a few broad groups, and many cats live normal lives once the cause is identified and managed.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

A seizure is a sudden burst of abnormal brain activity. It can look like full-body shaking, but it can also look like staring, drooling, hiding, or odd facial twitching.
Idiopathic epilepsy (seizures with no visible brain lesion) is the most common diagnosis in cats, found in about 81% of cats in one study where a cause was established [1].
Never give your cat a flea product made for dogs, and never use permethrin products on a cat. Permethrin can cause tremors and seizures, and cats are extremely sensitive to it [2].
During a seizure, do not put your hands near your cat's mouth. Clear the area, dim the lights, and time the event.
A seizure lasting longer than a few minutes, or more than one seizure in a row, is an emergency. Call your vet or an emergency clinic right away.

What a Seizure Looks Like in a Cat

Seizures in cats do not always look like the dramatic collapse people picture. The most common type reported is a generalized tonic-clonic seizure, which involves stiffening then rhythmic jerking of the whole body. In one case series, this pattern made up 83.3% of seizures in cats [3].

Other cats have focal seizures, which start in one part of the brain and affect one area of the body. You might see:

Twitching of one ear, eyelid, or side of the face
Lip smacking, chewing motions, or drooling
Sudden staring, dilated pupils, or a blank look
Head turning or one limb paddling
Hiding, restlessness, or unusual vocalizing

Some focal seizures are easy to mistake for behavior problems. In dogs, episodes of fear, hiding, staring into space, lip licking, and drooling turned out to be focal seizures with impaired awareness when confirmed with brain wave testing [4]. Cats can show similar subtle signs, so keep a video if you can.

What Is Normal (and What Is Not)

A single brief seizure in a cat that recovers quickly still deserves a vet visit, but it is not always an emergency. What matters is the pattern. Cluster seizures (two or more in 24 hours) and status epilepticus (a seizure that will not stop) are the patterns that need urgent care. In one study of 118 cats with epilepsy, single generalized seizures and cluster seizures happened at nearly the same rate (44.9% and 45.8%), while status epilepticus was less common at 9.3% [1].

Seizures in Cats While Sleeping

Some owners notice twitching during sleep and worry. Mild twitching, whisker movement, and paw paddling during dreaming are common and usually harmless. A true seizure during sleep looks different: the cat may stiffen, lose bladder control, or not wake up when you call. If you are unsure, film it and show your vet. Seizures that happen only during sleep or right after waking can point to specific brain patterns, and your vet may recommend further testing.

What Causes Cat Seizures

Vets sort seizures into three main groups: idiopathic epilepsy, structural epilepsy (a visible brain problem), and reactive seizures (a response to something outside the brain, like a toxin or metabolic problem) [3]. Which group your cat falls into depends heavily on age.

Causes by Age

Kittens and young cats. In young cats, the top concerns are toxins, infections, and congenital problems. A kitten having seizures may have eaten something toxic, including a flea product meant for a dog [2]. Other causes include head trauma, low blood sugar, and brain infections. Idiopathic epilepsy can also start in young adulthood.

Adult cats (roughly 1 to 7 years). This is the classic age for idiopathic epilepsy. In one study, the median age at presentation was 72 months (6 years), and idiopathic epilepsy was the leading diagnosis [1]. Structural causes like brain tumors and inflammation still need to be ruled out.

Senior cats (over 7 years). New seizures in an older cat are more likely to have a structural cause, such as a brain tumor, stroke, or metabolic disease. Age over 7 years was linked to a higher risk of death in one study of cats with epilepsy [5]. That does not mean the situation is hopeless, but it does mean older cats need prompt, thorough testing.

Main Causes at a Glance

Cause	Typical clues	How urgent
Idiopathic epilepsy	Young to middle-aged cat, normal exam between seizures, normal MRI	Urgent vet visit, then long-term management
Structural epilepsy (tumor, inflammation, scar tissue)	Older cat, neurological deficits, seizures that worsen over weeks	Urgent, same-day or next-day evaluation
Reactive seizures (toxins, low blood sugar, organ disease)	Sudden onset, possible exposure to a toxin or medication, other illness signs	Emergency if toxin suspected
Permethrin flea product exposure	Tremors, twitching, drooling after applying a dog product	Emergency now [2]
Brain infection or trauma	Recent injury, fever, behavior change, other neurologic signs	Emergency now
Metabolic problems (kidney, liver, thyroid)	Weight loss, vomiting, increased thirst, lethargy	Same-day vet visit

Epilepsy in Cats: What It Means

Epilepsy simply means a cat has repeated seizures. It is not one disease. Idiopathic epilepsy means no underlying brain lesion can be found, and it is the most common form in cats [1]. Some cats with temporal lobe epilepsy-like seizures show changes in the hippocampus, the memory center of the brain, including loss of certain neurons and abnormal rewiring of nerve fibers [6]. Research is still working out how these changes affect individual cats, and brain imaging in cats with idiopathic epilepsy often looks normal [7].

If your cat keeps seizing despite treatment, that is called refractory epilepsy, and it needs a different diagnostic approach. You can read more about that here: Feline Refractory Seizures: Diagnosis and Management.

Red Flags That Make It an Emergency

Call an emergency clinic right away if any of these happen:

The seizure lasts more than 3 to 5 minutes
A second seizure starts before your cat fully recovers
Three or more seizures happen in 24 hours (cluster seizures)
Your cat does not wake up or stays confused for more than 30 minutes
Breathing is labored, or the gums look blue or pale
You suspect poisoning, including a flea product meant for dogs [2]
Your cat is pregnant, very young, or has another serious illness

Status epilepticus is the most dangerous pattern. It was the least common seizure type in one study, but it carries the highest risk [1]. Do not wait to see if it stops on its own.

How to Keep Your Cat Safe During a Seizure

Your job during a seizure is simple: protect your cat from injury and gather information.

Do not touch your cat's mouth. Cats can bite down hard without meaning to. You cannot swallow your tongue, and trying to hold it can hurt both of you.
Clear the area. Move furniture, wires, and hard objects away. Put a pillow or folded towel under the head if you can do it safely.
Dim the lights and lower noise. Turn off the TV and keep other pets and children away.
Time the seizure. Note the start and end time. This is the single most useful piece of information for your vet.
Film it if you can. A short video helps your vet classify the seizure type.
Stay calm and talk softly. Your cat may not hear you during the seizure, but a calm voice helps you focus.

After the Seizure

Most cats go through a post-ictal phase. They may pace, hide, seem blind, drool, or act confused. This can last minutes to hours. Keep your cat in a quiet, safe room with low lighting, fresh water, and a litter box nearby. Do not force food or medication unless your vet tells you to.

If your cat has a known seizure disorder and your vet has prescribed a rescue medication, follow those instructions exactly. Dosing is calculated from your cat's weight and health, so never guess. For more on what to do in the moment and how medications fit in, see What to Do If Your Cat Has a Seizure: Medication and Emergency Response.

What Your Veterinarian Will Check

Your vet will start with a full history: when the seizures began, how long they last, what they look like, and whether anything changed recently (new food, new medication, new flea product). Bring the video and your timing notes.

The physical exam checks for neurological deficits, eye changes, heart problems, and signs of infection. Blood work looks at blood sugar, kidney and liver values, thyroid levels, and electrolytes. In one study, cats that did not survive had higher rates of abnormal white blood cell counts, low albumin, and other lab changes [5]. Those findings help vets spot cats who need more aggressive care.

Depending on the results, your vet may recommend:

Brain imaging (MRI) to look for tumors, inflammation, or structural changes
Cerebrospinal fluid analysis if infection or inflammation is suspected
Blood pressure and eye exam
Electroencephalography (EEG) in some cases, which can support a diagnosis of focal seizures when the exam and imaging are normal [4]

If your cat has other symptoms like head shaking or ear odor, those can point to a different problem. See Ear Infections In Cats Symptoms for comparison. Urinary signs are another common source of confusion in older cats, covered here: What Are Symptoms Of A Uti In A Cat.

Prevention and Monitoring

You cannot prevent every seizure, but you can lower some risks and track patterns.

Use only cat-labeled flea and tick products. Never apply a dog product to a cat. If your cat shows tremors or seizures after application, treat it as an emergency [2].
Keep toxins out of reach. Human medications, certain plants, and household chemicals are common culprits.
Stick to the medication schedule. If your vet prescribes an anti-seizure drug, give it at the same times every day. Skipping doses can trigger breakthrough seizures.
Keep a seizure log. Record date, time, duration, what the seizure looked like, and what happened before it. Patterns help your vet adjust treatment.
Watch for medication side effects. Sedation, wobbliness, and appetite changes are common and often dose-related. Learn what to expect here: What Are the Side Effects of Seizure Medication in Cats?.
Schedule regular rechecks. Blood work is often needed to make sure drug levels and organ values stay in a safe range.

Limitations and When to Contact a Veterinarian

This article covers general information, but every cat is different. A seizure in your cat needs a veterinarian who can examine your cat, review the history, and run the right tests. Use these timing guidelines:

Emergency now: seizure lasting more than 3 to 5 minutes, cluster seizures, suspected toxin exposure, trouble breathing, or a cat who will not wake up.
Same day: first-ever seizure in any cat, a seizure in a kitten or senior cat, or a seizure with vomiting, weakness, or behavior change.
Routine visit (within a few days): a known epileptic cat with a brief seizure that matches the usual pattern, or a mild change in seizure frequency.

If you are ever unsure, call your vet or a pet poison control hotline. It is always better to ask than to wait.

Frequently Asked Questions

Can a single seizure kill my cat?

A single brief seizure rarely causes death on its own, but prolonged or repeated seizures can. Status epilepticus, where seizures do not stop, is the most dangerous pattern and needs emergency treatment. Get help right away if a seizure lasts more than a few minutes.

Why is my kitten having seizures?

Kittens most often seize because of toxins, infections, low blood sugar, or head trauma. A common and preventable cause is exposure to a flea product made for dogs, especially permethrin, which cats are extremely sensitive to. Take any kitten with a seizure to a vet the same day.

Do cats grow out of epilepsy?

Most cats with idiopathic epilepsy need long-term management, though some have long gaps between seizures. Treatment aims to reduce how often and how severely seizures happen, not always to stop them completely. Your vet will adjust the plan based on how your cat responds.

Can I give my cat my own seizure medication?

No. Never give a cat human medication unless your vet prescribes it for your cat specifically. The dose depends on your cat's weight and health, and some human drugs are toxic to cats. Call your vet or a poison control hotline if your cat accidentally swallows any medication.

Are seizures in cats painful?

Most cats are not conscious during a generalized seizure, so they do not feel pain in the moment. The post-ictal phase can include confusion, pacing, and temporary vision changes, which may be distressing. Keep the environment calm and quiet while your cat recovers.

References

Clinical and Diagnostic Features of Feline Epilepsy: Distribution of Seizure Types and Associated Factors. Animals : an open access journal from MDPI, 2025.
Can Flea Medicine Cause Seizures in. Pet Poison Helpline.
Semiological and etiological classification of seizures in cats and dogs: 53 cases. The Journal of veterinary medical science, 2026.
Behavioral and autonomic manifestations of suspected focal impaired awareness seizures supported by interictal electroencephalographic findings in three dogs: a case series. Frontiers in veterinary science, 2026.
Survival Outcomes and Predictive Factors of Mortality in Feline Epilepsy: A Comprehensive Retrospective Study. Animals : an open access journal from MDPI, 2025.
Evidence of neuronal loss and granule cell axon reorganization in the dentate gyrus of cats with temporal lobe epilepsy-like seizures. American journal of veterinary research, 2026.
Interictal Single-Voxel Proton Magnetic Resonance Spectroscopy of the Temporal Lobe in Cats with Idiopathic Epilepsy: A Prospective Case-Control Study. Veterinary sciences, 2026.