Serious severity

Seizures & Epilepsy

A sudden burst of abnormal electrical activity in the brain that causes involuntary shaking, collapse or strange behaviour. A single seizure is frightening but not always an emergency; repeated or prolonged seizures always need veterinary attention.

⚠️ Common symptoms

Sudden collapse with stiffening or violent paddling of the legsTwitching, tremors or rhythmic muscle jerkingDrooling, chomping, vocalising or loss of bladder or bowel controlA dazed, staring or unresponsive spell (a focal or "absence" seizure)A brief period of restlessness or clinginess just before an episodeDisorientation, wobbliness or temporary blindness in the minutes afterwards

A seizure is the outward sign of a sudden, uncontrolled electrical storm in the brain. It can look dramatic — a cat collapsing on its side, legs paddling, jaw chomping, perhaps drooling or losing control of its bladder — or surprisingly subtle, such as a few seconds of staring, facial twitching or odd repetitive behaviour. Many episodes follow three phases: a short pre-ictal phase where the cat may seem restless, hidden or unusually clingy; the seizure itself, which usually lasts under two minutes; and a post-ictal phase of minutes to hours during which the cat may be disoriented, wobbly, ravenously hungry or briefly unable to see.

What matters most is understanding that a seizure is a symptom rather than a diagnosis. Unlike dogs, cats relatively rarely have true idiopathic epilepsy; far more often a feline seizure points to a specific underlying problem — a poisoning, a metabolic disturbance such as low blood sugar or liver disease, high blood pressure, an infection, or a structural change in the brain. That is why the veterinary focus is on investigation: bloodwork, blood pressure and often advanced imaging to uncover and treat the real cause.

One of the most preventable causes deserves special mention. Flea and tick products containing permethrin are made for dogs and are highly toxic to cats, and applying one to a cat — or letting a cat groom a freshly treated dog — is a common and entirely avoidable trigger of severe seizures. Lilies, antifreeze and several human medications are other frequent culprits, which is why prevention centres on a cat-safe home.

If your cat has a seizure, the calmest response is the safest. Do not try to restrain it or reach near its mouth; a seizing cat is not swallowing its tongue but may bite reflexively. Instead clear the area of hazards, soften the lights and noise, note the time, and film the episode if you safely can — that recording is genuinely useful to your vet. A single brief seizure with a full recovery warrants a prompt (non-emergency) veterinary visit, but a fit lasting more than five minutes, or repeated fits without recovery in between, is a true emergency that needs veterinary help straight away.

🔍 Causes

Seizures are a symptom, not a disease in themselves, and the list of triggers is long. Causes inside the brain include tumours, inflammation (encephalitis), infection, trauma and developmental abnormalities. Causes outside the brain include exposure to toxins — permethrin flea products meant for dogs, lily and other plant poisonings, antifreeze and certain human medications are notorious — as well as very low blood sugar, liver disease that lets toxins reach the brain, kidney failure, high blood pressure and thiamine deficiency. In some cats no cause is ever found, and the condition is labelled idiopathic epilepsy.

🛡 Prevention

Because so many feline seizures stem from poisoning, prevention starts with the home: never apply a dog flea product to a cat, keep lilies and other toxic plants out of the house, and store antifreeze, human pills and household chemicals well out of reach. Keeping up with vaccination and parasite control lowers the risk of infectious causes, and routine senior blood-pressure and blood tests can catch metabolic problems before they trigger a fit. For cats already diagnosed with epilepsy, giving medication exactly as prescribed and never stopping it suddenly is the single most important way to prevent dangerous breakthrough seizures.

💊 Treatment

The first job is to find out why the seizures are happening. Your vet will take a full history and run blood tests, blood-pressure checks and often imaging (MRI) or a spinal-fluid tap to look for causes such as toxins, low blood sugar, liver or kidney disease, infection or a brain tumour. When an underlying cause is found it is treated directly. When no cause can be identified — true idiopathic epilepsy, which is less common in cats than in dogs — or when seizures are frequent or severe, long-term anti-seizure medication such as phenobarbital or levetiracetam is used to reduce how often and how badly they occur. Any seizure lasting more than about five minutes, or a cluster of seizures one after another (status epilepticus), is a genuine emergency needing immediate veterinary care.

When to see a vet: Contact your vet after any first-time seizure, even if your cat seems completely normal afterwards, so the cause can be investigated. Seek emergency care immediately if a seizure lasts longer than five minutes, if one seizure runs straight into another without full recovery, or if your cat has several seizures in a single day. During an episode, do not try to hold or restrain your cat or put anything in its mouth — instead move furniture and hazards away, dim the lights and noise, time the event, and gently note what happened to describe to your vet.

🎬 Related videos

⚕️ Medical disclaimer

  • This information is educational only and is not a substitute for veterinary advice.
  • Symptoms overlap between conditions — only a vet can diagnose accurately.
  • Never withhold treatment or self-medicate based on information found online.
  • When in doubt, call your vet. Early intervention almost always leads to better outcomes.

← Back to Health & Ailments