Seizures, abnormal movements or behavior due to unusual electrical activity in the brain, are a symptom of epilepsy. But not all people who appear to have seizures have epilepsy.

Epilepsy is a problem with your brain’s electrical system. A surge of electrical impulses cause brief changes in movement, behavior, feeling, or awareness. These events, known as seizures, last from a few seconds to a few minutes.

When identifiable, the causes of epilepsy usually involve some form of injury to the brain. For most people, though, epilepsy's causes aren't known.

There are several types of seizures in epilepsy, including some that are so subtle that others might not even notice. Learn what to look for.