An epileptic fit, more commonly called a seizure, is a sudden burst of uncontrolled electrical activity in the brain. Normally, brain cells communicate through carefully timed electrical and chemical signals. During a seizure, large groups of neurons fire at the same time and much faster than usual, producing involuntary movements, altered sensations, changes in emotions, or loss of consciousness. Roughly 52 million people worldwide live with epilepsy, the condition defined by recurring seizures.
What Happens in the Brain During a Seizure
Your brain runs on electrical impulses. Neurons pass signals to one another through tiny channels that control the flow of charged particles (ions) in and out of each cell. When those channels malfunction, or when the balance between excitatory and inhibitory signals tips too far in one direction, a cascade of rapid, synchronized firing can spread across part or all of the brain. Think of it like a power surge in an electrical grid: too many signals traveling too fast overwhelm the system’s normal checks and balances.
Some forms of epilepsy trace back to genetic variations that affect these ion channels directly. Others develop after brain injuries, infections, strokes, or structural abnormalities. In many cases, the exact cause is never identified.
Types of Seizures
Not all seizures look the same. The International League Against Epilepsy classifies them into four main categories: focal, generalized, unknown, and unclassified. The two most important for everyday understanding are focal and generalized.
Focal Seizures
These start in one specific area of the brain. What you experience depends entirely on which part is affected. A focal seizure in the area that controls movement might cause one arm to jerk rhythmically. One starting in a sensory region could produce unusual smells, tastes, or visual distortions. You might stay fully aware throughout, or your awareness might fade. Focal seizures sometimes spread to involve the whole brain, becoming generalized.
Generalized Seizures
These involve both sides of the brain from the start. The most dramatic type is the tonic-clonic seizure (sometimes still called a “grand mal”). It unfolds in two distinct phases. In the tonic phase, the muscles suddenly stiffen, often causing the person to cry out and fall. Consciousness is lost. This phase typically lasts 10 to 20 seconds. Then comes the clonic phase: the arms and legs jerk rhythmically, alternately flexing and relaxing, usually for one to two minutes.
Absence seizures sit at the opposite end of the spectrum. Common in children, they cause a blank stare lasting about 10 seconds (sometimes up to 30). You might notice lip smacking, eyelid fluttering, or small hand movements, but there’s no falling or convulsing. The person has no memory of the episode afterward, and bystanders often mistake it for simple daydreaming.
Warning Signs Before a Seizure
Some people experience an “aura” in the minutes or seconds before a seizure begins. An aura is actually a small focal seizure itself, and it can take many forms: a sudden feeling of déjà vu, a wave of unexplained fear, visual distortions, strange smells, or dizziness. People with temporal lobe epilepsy report these most frequently.
In the hours before a seizure, subtler changes can appear. Studies tracking pre-seizure symptoms found that confusion and anxiety were the most common, affecting roughly 9% and 8.6% of episodes respectively. Irritability, anger, and mood shifts also show up in this window. These “prodromes” result from abnormal activity building in the temporal and frontal lobes before a full seizure takes hold. Recognizing your personal warning pattern, if you have one, can give you time to get to a safe place.
Common Triggers
Seizures don’t always strike randomly. Several well-established triggers can lower the threshold for one:
- Sleep deprivation is one of the most reliable triggers, especially for people already diagnosed with epilepsy.
- Psychological stress and emotional exhaustion can destabilize brain activity.
- Missed medication leaves the brain unprotected if you’re on anti-seizure drugs.
- Alcohol withdrawal disrupts the brain’s inhibitory signaling.
- Flickering or flashing lights can provoke seizures in people with photosensitive epilepsy.
- Hyperventilation (rapid, deep breathing) shifts blood chemistry in ways that can trigger absence seizures in particular.
Not everyone has identifiable triggers, but keeping a seizure diary that tracks sleep, stress, meals, and activities can help reveal patterns over time.
The Recovery Phase
What happens after a seizure often surprises people who haven’t experienced one. The recovery period, called the postictal state, can feel almost as disruptive as the seizure itself. The most common symptoms are exhaustion, confusion, sore muscles, and headache. You may have difficulty speaking, feel disoriented about where you are, or have no memory of what just happened. Some people experience nausea, loss of bladder control, or an elevated body temperature.
Recovery time varies widely. A brief absence seizure may leave no noticeable aftermath. A tonic-clonic seizure, on the other hand, may require a full day of rest. Your brain needs time to reset its normal signaling, and pushing through with demanding mental or physical tasks can extend the fog.
The emotional toll deserves attention too. Many people feel anxiety, embarrassment, or depression in the hours and days after a seizure, particularly if it happened in public. These feelings are a recognized part of postictal recovery, not a sign of weakness. For some, anxiety about having another seizure can linger well beyond the physical recovery.
How to Help Someone Having a Seizure
If you see someone having a tonic-clonic seizure, the most important thing is to keep them safe, not to stop the seizure. Here’s what to do:
- Stay calm and stay with the person.
- Ease them to the ground if they’re falling and clear the area around them of hard or sharp objects.
- Turn them gently onto their side with their mouth pointing toward the ground. This keeps the airway clear.
- Place something soft and flat (a folded jacket, for instance) under their head.
- Remove their glasses and loosen anything tight around the neck.
- Time the seizure from the start.
Do not put anything in their mouth. Despite the old myth, a person cannot swallow their tongue during a seizure, and placing objects between the teeth risks breaking them or causing choking. Do not try to restrain their movements.
When a Seizure Becomes an Emergency
A single seizure that stops on its own within a few minutes is usually not life-threatening, though a first-ever seizure always warrants medical evaluation. The situation changes when a seizure lasts longer than five minutes, or when repeated seizures occur without the person regaining consciousness between them. This is called status epilepticus, and it requires immediate emergency care. Prolonged seizure activity can injure the brain and become fatal if untreated.
You should also call for emergency help if the person is injured during the seizure, has difficulty breathing afterward, has a seizure in water, or if you know it’s their first seizure. Check for a medical alert bracelet, which may list their condition, medications, and emergency contacts.