What Is Epilepsy?

If you have ever been nearby when someone suddenly stiffened, fell, and started shaking — or, just as quietly, went blank and unresponsive for a few moments — you have probably wondered what was happening and whether you were doing the right thing. The short video at the top of this page, "What to do if someone is having a seizure," runs 1 minute 14 seconds and tackles exactly that uncertainty: how seizures and epilepsy are treated, what you should do in the moment, and what else can be tried when medicines do not control seizures well enough.

So what is actually happening during a seizure?

Your brain runs on organised electrical activity, with signals passing constantly between its cells. A seizure happens when a burst of abnormal, excessive activity disrupts that pattern for a short time. What you see from the outside depends on where in the brain it starts and how far it spreads — movement, awareness, sensation, and behaviour can all be affected, usually briefly. Epilepsy is the condition behind repeated seizures: not one isolated event, but a tendency for seizures to keep happening without a short-term trigger provoking each one. A single seizure on its own does not automatically mean epilepsy, which is one reason assessment after a first episode matters.

Do all seizures look the same?

No, and this is where many people get caught out. The dramatic shaking episode — sometimes called a convulsive seizure — is the version most of us picture, but it is far from the only one. Some seizures are brief lapses in awareness where the person stares, stops responding, and then picks up again, sometimes without realising anything happened. Others begin in one part of the brain and produce a strange sensation, a repeated movement in one limb, or a sudden intense feeling before either settling or spreading. This site's "Classification of Epileptic Seizures" video works as a useful companion here — it demonstrates the different types of epileptic seizures, organised around the international classification doctors use.

What brings epilepsy on?

Sometimes the answer is clear and sometimes, honestly, it is not found. Known routes in include an earlier injury to the brain, a stroke, an infection affecting the brain, or a difference in how the brain developed. Our guide to what happens during a stroke is relevant background for one of those routes. In many people no single cause is identified, and that uncertainty can be frustrating — but it does not stop treatment from helping, because management focuses on controlling seizures rather than only on the original cause.

How do doctors work it out?

It starts with the story: what happened, how long it lasted, and what it looked like — an account from someone who saw it can be just as valuable as the account from the person who had it, because awareness is often lost during the event itself. Tests may then be added to support the picture. A recording of the brain's electrical activity is commonly used, and brain imaging may be used to look for a structural reason. The aim is not just to label the episodes, but to understand their type well enough to choose sensible next steps.

What can you do if it happens in front of you?

Keep the person safe, and keep it simple. Move anything hard or sharp out of the way, cushion their head if you can, and give them space. Do not put anything in their mouth, and do not try to hold them down — both instincts are understandable, and both can cause harm. Time the seizure if you are able, stay until they recover, and help them rest somewhere safe afterwards, as confusion and tiredness are common for a while. Seek urgent help if a seizure lasts much longer than is usual for that person, if seizures follow one after another, if breathing seems difficult afterwards, or if the person does not gradually come back to themselves. Day to day, treatment usually centres on anti-seizure medicines taken regularly, with other options explored with a specialist when medicines alone do not control seizures — the goal the anchor video states plainly: to stop seizures, or control them as best as possible.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician and researcher.

Educational only — this article is general information about epilepsy, not medical advice and not a diagnosis. A first seizure, or any change in an established seizure pattern, needs prompt medical assessment rather than general information.

Frequently Asked Questions

Is epilepsy the same as having a seizure?
No. A seizure is a single event caused by a burst of abnormal electrical activity in the brain. Epilepsy is the ongoing condition — a tendency for seizures to recur without each one being provoked by a short-term trigger.

Can a seizure happen to someone who does not have epilepsy?
Yes. Illness, injury, and other short-term stresses on the brain can provoke a single seizure in someone who does not have epilepsy. That is why a first seizure still needs proper assessment, even if it never happens again.

What should you never do during a convulsive seizure?
Do not put anything in the person's mouth and do not restrain their movements. Instead, clear the area around them, cushion their head, time the seizure, and stay with them until they recover.

How is epilepsy usually treated?
Usually with anti-seizure medicines taken regularly, chosen and adjusted with the person's clinician. When medicines alone do not control seizures well enough, a specialist may discuss other options — the right plan depends on the seizure type and the individual.

When should you seek urgent help for a seizure?
Seek urgent help if a seizure lasts much longer than is usual for that person, if seizures repeat without recovery in between, if breathing seems difficult afterwards, or if the person does not gradually return to themselves.