Seizures in Cats

A seizure in cats is a sudden, uncontrolled electrical disturbance in the brain that can cause changes in behavior, movement, or consciousness.

What Are Seizures in Cats?

Seizures are often frightening to witness, especially in cats. In most cases, seizures themselves are not life-threatening unless they are prolonged, violent, or occur repeatedly in a short period of time.

Seizures can be categorized as:

• Intracranial, meaning they originate from a problem within the brain 
• Extracranial, meaning they are triggered by conditions outside the brain

Most seizures in cats are a symptom of an underlying condition rather than a disease on their own. For example, epilepsy is a brain disorder that causes recurrent seizures without an identifiable structural brain injury.

Unlike in dogs and humans, true epilepsy is relatively rare in cats. Because of this, it is important to investigate potential underlying causes before diagnosing epilepsy and determining treatment.

Types of Cat Seizures

Seizures in cats can look very different depending on which part of the brain is involved. While many people associate seizures with full-body convulsions and loss of consciousness, not all seizures are obvious or violent.

From most common to least common, seizure types in cats include:

Focal Seizures (Partial Motor Seizures)

These are the most common type of seizure in cats. They affect a specific area of the brain and typically cause localized body movements depending on the region involved.

There is usually no loss of consciousness, although the cat may appear dazed or temporarily unresponsive. Signs are often subtle and may include:

• Ear flicking
• Whisker twitching
• Eye twitching
• Facial or mouth movements

Because these seizures are often mild and nonviolent, they can easily be missed.

Generalized Seizures (Grand Mal Seizures)

Generalized seizures involve a larger portion of the brain and typically result in loss of consciousness.

These seizures cause tonic-clonic movements (convulsions), where muscles contract and relax repeatedly. The entire body is affected, and cats may:

• Fall over
• Paddle their legs
• Clench their jaw
• Drool
• Urinate or defecate

These episodes are usually dramatic and more easily recognized.

Psychomotor Seizures (Complex Partial Seizures)

Psychomotor seizures involve abnormal, repetitive behaviors without full loss of consciousness.

These may include:

• Growling
• Loud vocalization
• Violent chewing at the tail or skin
• Sudden racing or frantic movements

A classic example is a “fly-biting” seizure, where a cat suddenly snaps at the air as if trying to catch invisible insects.

Psychomotor seizures are sometimes considered a subtype of focal seizures because they originate from a specific brain region.

Cat Seizure Symptoms

Seizure symptoms in cats vary depending on the type and pattern of seizure.

Grand Mal Seizures

Grand mal seizures typically occur in three distinct phases:

Pre-ictal Phase (Before the Seizure)

This phase may begin minutes to hours before the seizure. Pet parents often notice behavioral changes such as sudden lethargy, dullness, restlessness, or hyperactivity. Some cats hide, while others seek increased attention.

This stage, sometimes called an “aura,” may include confusion, sleepiness, or altered awareness leading up to loss of consciousness.

Ictal Phase (During the Seizure)

During the ictal phase, the brain loses control over normal body function and the cat loses awareness.

Typical signs include:

• Full-body convulsions
• Leg paddling
• Jaw clenching
• “Chewing gum” movements
• Drooling or foaming at the mouth
• Loss of bowel or bladder control

Most seizures last 30–60 seconds, although some may last longer.

Post-ictal Phase (After the Seizure)

The post-ictal phase begins once convulsions stop. This recovery period can last from a few hours up to 48 hours.

During this time, cats may experience:

• Lethargy
• Disorientation
• Temporary blindness
• Hunger or thirst
• Vomiting
• Attention-seeking behavior

Cats gradually regain full awareness and coordination during this phase.

Focal and Psychomotor Seizures

Focal and psychomotor seizures often occur suddenly and may not have clearly defined pre- or post-ictal phases.

These seizures can begin and end quickly, and cats may appear normal immediately afterward.

Common ictal signs include:

• Facial twitching
• Head bobbing
• Leg paddling (often affecting one or two limbs)
• Mouth snapping or chewing motions
• Meowing, growling, or hissing
• Persistent circling
• Sudden, random running

What Causes Seizures in Cats?

Seizures in cats can be caused by problems inside the brain (intracranial causes) or conditions outside the brain (extracranial causes).

Some cats experience a single, isolated grand mal seizure triggered by an external factor, while others develop recurrent seizures due to underlying disease.

Toxins

Toxin exposure is one of the most common causes of sudden seizures in cats.

Examples include:

• Ethylene glycol (antifreeze)
• Neurotoxic rodenticides (certain types of rat poison)
• Medication overdoses, such as antihistamines or behavior-modifying drugs

Permethrin toxicity is frequently mistaken for seizure activity because it causes severe muscle twitching. This typically occurs when dog flea or tick products are mistakenly used on cats or when an excessive dose is applied. Even small amounts can be life-threatening in cats.

Most cats with permethrin toxicity do not respond well to anti-seizure medications but improve with muscle relaxants and sedatives.

Hypoglycemia (Low Blood Sugar)

Low blood sugar can trigger seizures, especially in kittens that are malnourished, not eating properly, receiving inadequate calories, or carrying heavy internal parasite burdens.

Hypoglycemia can also occur in diabetic cats receiving excessive insulin. If your cat has recently been diagnosed with diabetes, discuss proper insulin dosing and monitoring with your veterinarian.

Loud Noises and Bright Lights

In some cases, loud noises or bright lights may trigger seizure episodes. The exact mechanism is not fully understood, but certain stimuli can provoke abnormal brain activity in susceptible cats.

Metabolic Diseases and Epilepsy

Recurrent seizures are often linked to underlying metabolic diseases such as:

• Liver disease
• Kidney disease
• Thyroid disease

Cats over 6 years of age are more likely to develop seizures secondary to systemic disease.

Epilepsy is diagnosed most commonly between 1 and 3 years of age. However, unlike in dogs and humans, true genetic epilepsy is rare in cats.

Epilepsy may result from:

• Abnormal brain development
• Brain trauma
• Infectious disease
• Cancer

When extensive testing fails to identify a cause, the condition is called idiopathic epilepsy, which is uncommon in cats.

Heat

Heatstroke and high fevers caused by infections, immune-mediated diseases, or certain cancers can disrupt normal brain function and trigger seizures.

Disease of the Brain

Intracranial diseases are common causes of seizures in cats.

Inflammation of the brain (encephalitis) or surrounding tissues (meningitis) can result from infections such as:

• Cryptococcus
• Toxoplasmosis
• Feline infectious peritonitis (FIP)

Immune-mediated inflammation can also cause seizure activity.

Vascular Issues or Stroke

Strokes are less common in cats than in dogs but can occur.

They are often secondary to conditions such as:

• Hyperthyroidism
• Heart disease
• Diabetes mellitus
• Kidney failure

These diseases may lead to high blood pressure (hypertension), increasing the risk of vascular events in the brain.

Brain Tumors

Brain tumors are a common cause of seizures in cats over 10 years old.

Many are slow-growing and benign tumors that arise from tissues surrounding the brain. As tumors enlarge, they increase pressure within the skull, leading to inflammation and seizure activity. Some tumors may be surgically removable depending on location.

What To Do if Your Cat Has a Seizure

Seek emergency veterinary care immediately if your cat’s seizure lasts longer than 2–3 minutes or if multiple seizures occur without full recovery between episodes.

A condition called status epilepticus can develop in these situations. This is a life-threatening emergency that can cause dangerously high body temperatures, brain swelling, coma, and death if untreated.

Although seizures are frightening to witness, many are brief and not immediate emergencies. Contact your veterinarian if your cat has:

• Multiple seizures in one day but returns to normal between them, or
• More than one seizure per month while otherwise acting normally

Keep a detailed seizure log including:

• Date and time
• Type of seizure
• Duration
• Frequency
• Pre-ictal and post-ictal signs

If possible, record a video of the episode. This can be extremely helpful for diagnosis. Provide your veterinarian with as much detail as possible, including any recent illness, medication changes, or potential toxin exposure.

The age at which seizures begin, the type of seizure, and how frequently they occur form important diagnostic patterns. Identifying these patterns helps veterinarians determine underlying causes and appropriate treatment

If You Notice a Seizure Coming (Pre-Ictal Phase)

Not all seizures have a warning phase, but if your cat shows pre-ictal signs (restlessness, confusion, hiding, or seeking attention), you can help reduce injury risk by:

• Placing thick blankets or pillows nearby
• Keeping lighting low
• Minimizing noise and stimulation

During the Seizure (Ictal Phase)

• Do not put your hands near your cat’s mouth.
• Do not attempt to restrain them.
• Avoid placing your face close to their mouth.

Jaw clenching is involuntary and can cause serious injury. Sit nearby to monitor your cat while ensuring they are protected from sharp objects or falls.

Remain calm. Seizures can sometimes trigger temporary aggression due to confusion.

After the Seizure (Post-Ictal Phase)

As the seizure slows or stops:

• Speak softly and calmly
• Keep the environment quiet
• Allow your cat time to regain awareness

Your cat may appear confused, temporarily blind, or disoriented. 

Offer small amounts of water and food once your cat is fully alert, but avoid large portions to prevent vomiting and an upset stomach.

Can a Cat's Behavior Change After a Seizure?

Yes, a cat’s behavior can temporarily change after a seizure, but most cats do not experience long-term effects.

During a seizure, some cats may appear confused, disoriented, or even aggressive. This behavior is usually temporary, and most cats return to their normal behavior once they fully recover.

However, episodes of status epilepticus—prolonged or repeated seizures without recovery—can lead to lasting neurologic effects due to reduced oxygen supply to the brain.

Seizures caused by underlying brain disease, such as tumors, may also result in persistent behavioral changes. This occurs because pressure or inflammation in specific brain regions can affect personality, awareness, or neurologic function.

If you notice ongoing behavioral changes after a seizure, contact your veterinarian for further evaluation.

Can a Cat Die From a Seizure?

Death from a single seizure in cats is uncommon.

Most often, fatalities come from:

• Untreated status epilepticus
• Toxin ingestion that causes other metabolic abnormalities
• Chronically low blood sugar that leads to a ketotic state, where the body burns fat instead of sugar
• Certain infections such as feline infectious peritonitis (FIP)

How Veterinarians Find the Cause of a Cat's Seizures

To determine the cause of seizures in cats, veterinarians first rule out conditions outside the brain (extracranial causes) before pursuing advanced brain imaging.

Extracranial causes are generally easier and less expensive to evaluate. Because imaging the brain requires advanced diagnostics such as MRI—which can be costly—veterinarians typically begin with a thorough systemic workup.

Initial testing often includes:

• Complete bloodwork to evaluate bone marrow function and screen for liver, kidney, or gastrointestinal disease
• Urinalysis to check for infection or kidney abnormalities
• Blood pressure measurement to assess for hypertension
• Infectious disease testing to rule out viral infections (FIP, FIV, feline leukemia), bacterial infections, parasitic infections (such as toxoplasmosis), or fungal infections like Cryptococcus
• Abdominal imaging (X-rays or ultrasound) to further evaluate chronic diseases such as kidney disease, liver disease, or cancer

Intracranial causes are most definitively evaluated with an MRI, which allows detailed imaging of the brain and the meninges (the tissues surrounding the brain). In many cases, a spinal fluid sample (CSF tap) is collected to assess for inflammation or infectious disease affecting the nervous system.

Treatments for Cats With Seizures

Treatment for seizures in cats depends entirely on the underlying cause.

When seizures are triggered by systemic disease—such as kidney disease, hypertension, diabetes mellitus, liver disease, or cancer—addressing the primary condition is essential to reduce further seizure activity

After a first-time seizure, treatment is not always started immediately. Veterinarians often recommend close monitoring to determine whether additional seizures occur and how soon they recur.

Anti-Convulsant Therapy

Anti-convulsant medications are typically prescribed for frequent seizure activity. Common medications include:

• Phenobarbital
• Potassium bromide
• Levetiracetam (Keppra)
• Zonisamide

These medications may be used alone or in combination, depending on how each individual cat responds.

Anti-convulsant therapy is often lifelong. Regular blood testing is required to monitor medication levels and adjust dosing appropriately. Some medications—particularly phenobarbital—can cause toxicity at high levels and must be carefully managed.

Hospitalization and Emergency Treatment

Cats experiencing seizures due to hypoglycemia, toxin ingestion, or severe systemic illness (such as kidney failure) often require hospitalization.

Treatment may include:

• Intravenous fluids
• Dextrose (sugar) supplementation
• Targeted therapy for the underlying condition

Kittens with hypoglycemic seizures often recover well with prompt glucose supplementation, proper parasite control, and adequate caloric intake.

Can You Prevent Seizures in Cats?

In most cases, seizures in cats cannot be fully prevented once they begin.

Even with excellent veterinary care and diligent home monitoring, some cats will continue to experience seizure activity. The focus of long-term management is typically on reducing the frequency, duration, and severity of seizures rather than eliminating them entirely.

Frequent follow-up visits and monitoring of medication levels and metabolic health are often necessary throughout a cat’s life. With proper management, many cats with seizures can maintain a good quality of life and continue to live comfortably with their families.