Fits can be frightening for both the person having them and the people watching. Many people search online asking, “what causes fits?” because they want clear answers about seizures, epilepsy, sudden shaking, blackouts, or loss of awareness. A fit may happen once in a lifetime or may become a repeated medical condition that needs long-term care.
Understanding what causes fits is important because seizures can happen for many different reasons. Some causes are mild and temporary, while others may point to serious health conditions that need immediate medical attention.
This complete guide explains what causes fits in adults, children, and dogs in simple language. It also covers symptoms, warning signs, risk factors, diagnosis, treatment, prevention, and when to seek emergency help.
What Are Fits?
A fit is another word often used for a seizure. A seizure happens when there is sudden abnormal electrical activity in the brain. This electrical disturbance can affect movement, behavior, awareness, emotions, or consciousness.
Some fits involve violent shaking of the body, while others are very mild and may only cause staring, confusion, or unusual sensations.
Fits can last from a few seconds to several minutes. In some cases, a person recovers quickly. In others, recovery may take longer.
Many people think all fits involve falling to the ground and shaking, but this is not always true.
Types of Fits
Understanding different seizure types helps explain what causes fits and how they appear in different people.
Generalized Seizures
These seizures affect both sides of the brain.
Symptoms may include:
- Full body shaking
- Loss of consciousness
- Muscle stiffness
- Sudden falls
- Confusion after the seizure
Focal Seizures
These begin in one area of the brain.
Symptoms may include:
- Jerking in one arm or leg
- Strange smells or tastes
- Sudden fear or panic
- Repeated movements
- Confusion
Absence Seizures
These are common in children.
The child may:
- Stare blankly
- Stop speaking briefly
- Blink rapidly
- Seem unaware for a few seconds
Febrile Seizures
These happen in young children during high fever.
They are usually short and often do not cause long-term problems.
What Causes Fits?
Many medical and non-medical conditions can trigger seizures. Sometimes the cause is temporary. In other cases, the fits happen because of a long-term brain disorder.
Below are the most common answers to the question: what causes fits?
Epilepsy
Epilepsy is one of the most common causes of repeated fits.
It is a neurological disorder where the brain produces repeated seizures over time. Some people are born with epilepsy, while others develop it later in life.
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A person may be diagnosed with epilepsy after having two or more unprovoked seizures.
Common epilepsy triggers include:
- Lack of sleep
- Stress
- Flashing lights
- Alcohol
- Missed medication
- Hormonal changes
High Fever
High fever is a common reason for fits in babies and young children.
These are called febrile seizures.
They usually happen between 6 months and 5 years of age. Although they are scary to watch, most febrile seizures are harmless and children recover fully.
Head Injuries
Brain injuries can damage electrical pathways in the brain.
Fits may happen:
- Immediately after injury
- Weeks later
- Months or years later
Sports injuries, falls, road accidents, and physical trauma may all increase seizure risk.
Stroke
Stroke is one of the leading answers to the question what causes epileptic fits in adults.
A stroke interrupts blood flow to the brain, damaging brain tissue. This damage may trigger seizures.
Older adults are especially at risk.
Brain Tumors
Tumors can press on brain tissue and interfere with normal electrical signals.
Both cancerous and non-cancerous tumors may cause fits.
Symptoms may also include:
- Headaches
- Vision problems
- Memory loss
- Weakness
- Personality changes
Low Blood Sugar
Low blood sugar, also called hypoglycemia, can trigger fits.
This is especially common in people with diabetes.
The brain depends on glucose for energy. When blood sugar falls too low, brain function may become unstable, causing seizures.
Infections
Certain infections affecting the brain can lead to seizures.
Examples include:
- Meningitis
- Encephalitis
- Brain abscess
- Severe malaria
- COVID-19 complications in rare cases
Infections can cause swelling and irritation in brain tissue.
Lack of Oxygen
The brain needs a constant oxygen supply.
Reduced oxygen levels from drowning, choking, heart problems, or breathing disorders may trigger fits.
Alcohol and Drug Use
Alcohol withdrawal is a major cause of seizures in adults.
Illegal drugs such as cocaine, methamphetamine, and ecstasy can also trigger fits.
Some prescription medicines may increase seizure risk if taken incorrectly.
Sleep Deprivation
Lack of sleep affects brain activity.
For some people, even one night of poor sleep can trigger a seizure.
Sleep-related seizures are common in epilepsy patients.
Stress and Emotional Trauma
Stress alone may not directly cause epilepsy, but it can trigger fits in people already vulnerable to seizures.
Anxiety, panic, emotional trauma, and mental exhaustion may increase seizure frequency.
Flashing Lights
Some people have photosensitive epilepsy.
Flashing lights, video games, concerts, or bright visual patterns may trigger seizures.
This type is less common but important to recognize.
Genetic Factors
Some seizure disorders run in families.
Researchers have identified genetic mutations linked to epilepsy and abnormal brain activity.
A family history of seizures can increase risk.
Developmental Disorders
Conditions affecting brain development may cause fits.
These include:
- Autism spectrum disorder
- Cerebral palsy
- Intellectual disabilities
- Birth complications
Kidney or Liver Failure
When organs fail, toxins may build up in the blood and affect brain function.
This can trigger seizures in severe cases.
Electrolyte Imbalance
The brain relies on balanced minerals like sodium, calcium, and potassium.
Severe imbalances may disrupt brain signals and cause fits.
What Causes Epileptic Fits in Adults?
Many adults search specifically for what causes epileptic fits in adults because seizures beginning later in life often have a medical cause.
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Common causes include:
- Stroke
- Brain tumors
- Head injuries
- Alcohol withdrawal
- Drug abuse
- Brain infections
- Dementia
- Low blood sugar
- Sleep deprivation
In some adults, doctors never find a clear reason. This is called idiopathic epilepsy.
What Can Cause an Epileptic Fit?
Many triggers can cause an epileptic fit even in people already diagnosed with epilepsy.
Common seizure triggers include:
- Missing medication
- Emotional stress
- Lack of sleep
- Flashing lights
- Alcohol
- Fever
- Hormonal changes
- Dehydration
- Drug use
- Illness
Keeping a seizure diary may help identify personal triggers.
Early Warning Signs Before a Fit
Some people experience warning symptoms before a seizure.
These warning signs are called an aura.
Common symptoms include:
- Strange smells
- Tingling sensations
- Sudden fear
- Dizziness
- Nausea
- Blurred vision
- Headache
- Feeling detached from reality
An aura can act as an early warning that a seizure is coming.
Symptoms During a Fit
Symptoms vary depending on seizure type.
Common signs include:
- Body shaking
- Muscle stiffness
- Staring spells
- Sudden collapse
- Loss of awareness
- Confusion
- Lip smacking
- Repeated movements
- Breathing changes
- Loss of bladder control
Not every fit involves shaking.
What Happens After a Fit?
After a seizure, many people enter a recovery phase called the postictal stage.
Symptoms may include:
- Sleepiness
- Confusion
- Headache
- Weakness
- Memory problems
- Trouble speaking
Recovery time varies from minutes to hours.
What Causes Fits in Dogs?
Many pet owners also search for what causes fits in dogs because seizures in pets can be alarming.
Dogs can experience seizures for many of the same reasons humans do.
What Causes Dogs to Have Fits?
The most common causes include:
- Epilepsy
- Poisoning
- Liver disease
- Brain tumors
- Low blood sugar
- Heat stroke
- Kidney disease
- Infections
- Head injuries
Some dog breeds are more likely to develop epilepsy.
Dog Breeds More Prone to Fits
Certain breeds have higher seizure risk, including:
- German Shepherds
- Labrador Retrievers
- Beagles
- Border Collies
- Golden Retrievers
Genetics may play a major role.
Signs of Fits in Dogs
Dog seizures may involve:
- Falling over
- Leg paddling
- Drooling
- Stiffness
- Uncontrolled shaking
- Loss of awareness
- Temporary blindness
- Confusion after the seizure
Some dogs become anxious or hide before a seizure begins.
What to Do During a Fit
Knowing how to respond can help prevent injury.
If someone has a fit:
- Stay calm
- Move dangerous objects away
- Turn the person onto their side
- Loosen tight clothing
- Time the seizure
- Protect their head
- Do not hold them down
- Do not place anything in their mouth
Most seizures stop on their own within a few minutes.
When to Call Emergency Services
Seek emergency help if:
- The seizure lasts more than 5 minutes
- Another seizure starts immediately
- Breathing problems occur
- The person is injured
- It is their first seizure
- The person is pregnant
- The seizure happens in water
These situations may become life-threatening.
How Doctors Diagnose the Cause of Fits
Doctors use several tests to understand what causes fits.
Medical History
The doctor may ask:
- What happened before the seizure?
- How long did it last?
- Was there shaking?
- Was consciousness lost?
- Is there family history?
Witness descriptions are often very helpful.
Brain Scan
CT scans and MRI scans look for structural brain problems such as tumors, bleeding, or injuries.
EEG Test
An electroencephalogram records electrical activity in the brain.
It helps identify abnormal seizure patterns.
Blood Tests
Blood tests check for:
- Infection
- Blood sugar problems
- Electrolyte imbalance
- Organ failure
Spinal Fluid Testing
Sometimes doctors test spinal fluid if brain infection is suspected.
Treatment for Fits
Treatment depends on the cause.
Anti-Seizure Medicines
Doctors often prescribe anti-epileptic medications.
Common medicines include:
- Levetiracetam
- Valproate
- Lamotrigine
- Carbamazepine
These medicines help stabilize brain activity.
Surgery
Some patients benefit from brain surgery if seizures come from one specific area.
Lifestyle Changes
Healthy habits can reduce seizure risk.
Helpful steps include:
- Getting enough sleep
- Avoiding alcohol
- Managing stress
- Taking medicines regularly
- Staying hydrated
Ketogenic Diet
Some children with difficult epilepsy improve on a ketogenic diet.
This high-fat, low-carbohydrate diet changes how the brain uses energy.
Vagus Nerve Stimulation
A device placed under the skin sends electrical signals to help reduce seizures.
Can Fits Be Prevented?
Not all seizures can be prevented, but some risks can be reduced.
Ways to lower risk include:
- Wearing helmets
- Controlling blood sugar
- Treating infections quickly
- Avoiding illegal drugs
- Managing stress
- Taking epilepsy medication correctly
Are Fits Dangerous?
Many seizures are short and harmless.
However, repeated or long seizures can be dangerous.
Possible complications include:
- Injury from falls
- Breathing problems
- Memory issues
- Brain damage in severe cases
- Sudden unexpected death in epilepsy (rare)
Proper treatment greatly reduces risk.
Living With Epilepsy and Seizures
Millions of people live healthy lives with epilepsy.
Success often depends on:
- Following treatment plans
- Avoiding triggers
- Regular doctor visits
- Family support
- Education about seizures
Many people become seizure-free with proper care.
Emotional Impact of Fits
Seizures affect emotional health as well as physical health.
People with epilepsy may experience:
- Anxiety
- Depression
- Social isolation
- Fear of public seizures
Support groups and counseling may help improve confidence and mental health.
Common Myths About Fits
Myth: People swallow their tongue during a seizure
This is false.
You should never place objects in someone’s mouth during a seizure.
Myth: Every fit means epilepsy
Not true.
Some seizures happen only once because of fever, injury, or illness.
Myth: Seizures are always dramatic
Many seizures are subtle and hard to notice.
Myth: People with epilepsy cannot live normal lives
Most people with epilepsy can work, study, drive, and enjoy daily life with proper treatment.
What Parents Should Know About Fits in Children
Children with seizures need careful medical evaluation.
Parents should:
- Record seizure details
- Monitor fever
- Give medicine correctly
- Inform teachers
- Keep emergency contacts ready
Most children with febrile seizures recover completely.
Can Stress Cause Fits?
Stress alone usually does not directly cause epilepsy, but it can trigger seizures in vulnerable people.
Long-term stress may affect sleep, hormones, and brain function, increasing seizure risk.
Stress management techniques may help reduce episodes.
Can Anxiety Cause Fits?
Severe anxiety may trigger events that resemble seizures.
These are sometimes called psychogenic non-epileptic seizures (PNES).
Unlike epilepsy, PNES are linked more closely to psychological factors.
Proper diagnosis is important because treatment differs.
Can Dehydration Cause Fits?
Yes, severe dehydration may lead to electrolyte imbalance, which can trigger seizures.
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Children and older adults are especially vulnerable.
Can Fever Cause Fits in Adults?
Fever-related seizures are more common in children, but severe infections and high fever can occasionally trigger fits in adults too.
Can Lack of Sleep Cause Fits?
Yes.
Sleep deprivation is one of the most common seizure triggers in epilepsy patients.
The brain becomes more sensitive to abnormal electrical activity when exhausted.
The Future of Seizure Treatment
Medical research continues to improve seizure care.
New developments include:
- Advanced brain imaging
- Genetic testing
- Targeted medications
- Wearable seizure monitors
- Brain stimulation therapies
Scientists are working toward safer and more effective treatments.
Final Thoughts on What Causes Fits
Understanding what causes fits can help people recognize symptoms early, seek treatment faster, and reduce fear around seizures.
Fits can happen because of epilepsy, fever, brain injuries, infections, stress, low blood sugar, stroke, alcohol withdrawal, or many other medical conditions. In dogs, fits may result from epilepsy, poisoning, organ disease, or brain problems.
The most important step is proper medical evaluation. A single seizure may not always mean epilepsy, but repeated seizures should never be ignored.
With the right treatment, healthy lifestyle habits, and medical support, many people and animals with seizures live full and active lives.
FAQs About What Causes Fits
Can someone have a fit only once in life?
Yes. Some people experience a single seizure because of fever, low blood sugar, dehydration, or head injury and never have another one.
Are fits hereditary?
Some forms of epilepsy have a genetic link, meaning seizure disorders can run in families.
Can bright screens cause fits?
In people with photosensitive epilepsy, flashing lights and screens may trigger seizures.
Do all seizures require medication?
No. Treatment depends on the cause, seizure frequency, and overall health of the person.
Can dogs recover fully after a fit?
Yes. Many dogs recover completely after seizures, especially when the underlying cause is treated properly.
Is epilepsy curable?
Some children outgrow epilepsy, while others control seizures successfully with medication or surgery.
Can dehydration trigger seizures in children?
Yes. Severe dehydration may affect brain function and increase seizure risk.
Can emotional trauma lead to fits?
Emotional trauma may trigger seizures in people already vulnerable to epilepsy and may contribute to non-epileptic seizure disorders.
Should someone sleep after a seizure?
Many people feel tired after a seizure and need rest during recovery.
What foods can trigger seizures?
Certain people may be sensitive to alcohol, excessive caffeine, or skipped meals. However, food triggers vary from person to person.
