Not every epileptic seizure causes a fall or complete loss of consciousness. A localised, or focal, seizure may cause facial twitching or repeated abnormal mouth movements, for example. Even a single first seizure warrants contact with a vet before recurrence has been established.
When to see a vet urgently
Call an emergency vet immediately if a seizure is not starting to stop or you notice any of the following:
- convulsions continue for several minutes, particularly if approaching five minutes;
- another seizure starts before your cat has recovered, or several occur within the same day;
- breathing becomes difficult, your cat does not regain consciousness, or you suspect poisoning or a head injury.
The five-minute threshold does not mean you should wait that long to make contact. Find a vet near you.
Overview
Seizures in cats can be primary, as in idiopathic epilepsy, or secondary, also called symptomatic. In the first case, seizures arise from disturbed electrical activity in the brain without an identifiable cause. In the second, they result from a condition such as injury, infection, a tumour or poisoning. A seizure disorder is not a disease in itself but a symptom whose underlying cause needs investigation.
This classification is refined by distinguishing structural and reactive seizures. In structural epilepsy, the brain has a change such as a tumour, inflammation or injury. A reactive seizure results from a disturbance outside the brain, such as low blood glucose or a toxin. This does not itself mean epilepsy, and seizures may stop once the disturbance is corrected.
Idiopathic epilepsy is a diagnosis of exclusion: investigations find no metabolic, toxic or structural cause explaining the seizures. Appearing healthy between seizures is not enough to confirm it. Equally, a single seizure does not establish persistent epilepsy.
Causes
- idiopathic epilepsy, less common in cats than dogs;
- head injuries;
- brain tumours;
- inflammatory diseases of the central nervous system, such as meningitis, meningoencephalitis, FIP and toxoplasmosis;
- metabolic disorders, including liver or kidney failure and low blood glucose;
- poisoning from lead, insecticides such as permethrin in dog tick treatments, or medicines;
- congenital brain abnormalities.
Permethrin exposure can occur even without applying the product directly to a cat: a cat may lick a recently treated dog's coat. If this is possible, tell the vet immediately and bring the packaging. Trembling, drooling and seizures can accompany poisoning, but the absence of signs immediately after exposure does not guarantee safety.
Risk factors
- young cats, with idiopathic epilepsy;
- older cats, more often with secondary seizures due to tumours or metabolic disorders;
- cats with chronic liver or kidney diseases;
- cats that go outdoors and are exposed to toxins.
Age helps guide investigations but does not determine the cause alone. Idiopathic epilepsy can start at different ages, and young cats can also have structural or metabolic disease. New signs, such as changes in balance, behaviour or vision, are considered regardless of age.
Typical symptoms
- sudden loss of consciousness;
- whole-body or localised convulsions;
- chewing movements and drooling;
- involuntary urination or defecation;
- confusion afterwards, known as the postictal phase;
- in status epilepticus, an uninterrupted series of seizures.
During a generalised seizure, a cat may stiffen and paddle their limbs. In a focal seizure, signs may be limited to the face or one limb, and awareness varies. A focal seizure can also become generalised. The absence of whole-body convulsions therefore does not rule out an epileptic seizure.
Post-seizure confusion may appear as restlessness, aimless walking or unusual tiredness. Record the duration of the seizure itself separately from recovery time. If your cat does not start recovering or consciousness remains clearly abnormal, urgent assessment is needed.
However, not all twitching or falling is epilepsy. Fainting and some movement disorders, for example, can resemble seizures. A home video and an account of what happened before and afterwards help distinguish them.
Complications and consequences
- injuries from falling during seizures;
- brain swelling and death with prolonged convulsions;
- oxygen deprivation and organ damage;
- chronic epilepsy following repeated seizures.
Repeated seizures do not automatically turn a correctable toxic or metabolic disturbance into chronic epilepsy. However, a prolonged seizure can damage the brain and become harder to stop. Status epilepticus means a prolonged seizure or seizures between which consciousness does not return. It does not require continuously visible whole-body convulsions in every situation.
Diagnosis at the vet
- the history, including your description of the seizures;
- a neurological examination;
- a complete blood count and blood biochemistry to assess the liver, kidneys and electrolytes;
- infection tests for FIP, toxoplasmosis, FeLV and FIV;
- brain MRI or CT;
- cerebrospinal fluid examination.
The vet asks about seizure timing, duration, recurrence and recovery. Mention all medicines, supplements, parasite treatments and possible exposures, and whether eating, sleep or a recurring sound was involved. Blood glucose, blood pressure and a urine sample may also help establish the underlying cause.
MRI looks for structural changes in the brain. A cerebrospinal fluid sample may provide information about inflammation, but its need and the safety of collecting it are assessed separately. Not every cat undergoes all these investigations in the same order. Stabilising an animal actively having seizures takes priority over an extensive investigation programme.
Infection tests are chosen according to symptoms and other findings. Coronavirus antibodies alone, for example, do not establish FIP, and a single routine blood test does not confirm neurological FIP. A positive result must be interpreted alongside an appropriate sample, clinical findings and the possibility of other diseases.
During a seizure at home
Check the time when the seizure starts. Move sharp objects away, prevent falls and keep other animals and children at a distance. Dim lights and reduce noise. Do not forcibly restrain your cat or put fingers or objects into their mouth: they will not swallow their tongue, but may bite unintentionally.
Move your cat only if they are in immediate danger, and protect yourself with a thick towel. Record the event only if safe and without delaying contact. Afterwards, let your cat rest in a quiet, safe space. Do not force food or water into the mouth.
If rescue seizure medicine has been prescribed for home use, follow only the written action plan you received. Do not try to give an ordinary oral medicine to a cat that is convulsing or cannot swallow properly. Tell the emergency practice what has been given and when.
Treatment and follow-up
Emergency treatment aims to stop the seizure and support breathing and circulation. Possible causes, such as a blood glucose disturbance or poisoning, are investigated and corrected while complications are monitored. A seizure that is difficult to control may require anaesthesia and intensive monitoring. The end of visible movements does not always establish that seizure activity in the brain has stopped.
Long-term antiseizure medication is considered according to seizure type, number, severity and underlying disease. Treatment may aim to reduce frequency and severity even if complete seizure freedom is not achieved. A suitable medicine or dose cannot be inferred from another cat's or dog's treatment.
Keep a seizure diary, including missed or vomited medicines and possible adverse effects. Medicines may cause sleepiness, particularly initially, but report severe or persistent changes. Follow-up blood tests can monitor drug concentrations and organ function according to the medicine chosen. Sudden withdrawal can worsen seizures, so do not stop medication yourself.
Prevention
- Keep toxins and medicines dangerous to cats out of reach, and never use dog tick treatments on a cat.
- Monitor and treat chronic liver and kidney diseases.
- Take your cat to a vet experienced in neurology promptly after the first seizures and regularly afterwards.
- Give epilepsy medicines exactly as instructed.
- Reduce stress, as it can trigger seizures.
There is no proven way to prevent idiopathic epilepsy. Reducing stress can support wellbeing but does not replace medicines or remove structural disease. Always check which species a parasite medicine is intended for, and follow a dog's topical product instructions about keeping cats separate too.
Prognosis
The outlook depends particularly on the cause and treatment response. A correctable metabolic disorder may have a very different outcome from progressive brain disease. Some brain tumours can also be treated. Many cats with epilepsy can enjoy good daily lives with monitoring and medicines; one severe seizure alone does not determine the outlook for the rest of their life.
Important for cat owners
A seizure disorder is a serious sign that must not be ignored. Remember that even one epileptic seizure warrants investigation to rule out a tumour, infection or poisoning. If a seizure is prolonged or recurs, go to a vet or emergency practice immediately because delay can cost your cat's life.
This article provides general information and does not replace veterinary care. If you notice signs of illness in your cat, contact a vet.
Frequently asked questions
Can a cat have a seizure without losing consciousness?
Yes. A focal seizure may cause only twitching of the face or a limb, or abnormal mouth movements. Some awareness may remain. Record repeated unusual events and show the vet.
Does one seizure definitely mean epilepsy?
No. Poisoning, a metabolic disturbance or brain disease may be responsible, for example. Contact a vet after a first seizure even if your cat returns to normal.
Can seizure medicine be stopped when seizures no longer occur?
Not on your own. The medicine may be the reason for seizure freedom, and sudden withdrawal can cause severe seizures. Any change follows the vet's plan.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Seizures and Epilepsy in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Vet Q&As: What to know about epilepsy in cats, PDSA, accessed 2026-11-03.
- Epilepsy in Small Animals, Merck Veterinary Manual, accessed 2026-11-03.
- Feline Epilepsy, North Downs Specialist Referrals, accessed 2026-11-03.
- ACVIM Consensus Statement on the management of status epilepticus and cluster seizures in dogs and cats, ACVIM, Journal of Veterinary Internal Medicine, accessed 2026-11-03.
- Guideline for Feline Infectious Peritonitis, ABCD, accessed 2026-11-03.
- Permethrin: do not put your cat at risk, Veterinary Medicines Directorate, accessed 2026-11-03.
- Neurological Disorders, Cornell University College of Veterinary Medicine, accessed 2026-11-03.