Epilepsy is a neurological condition that makes people susceptible to seizures. A seizure is a change in sensation, awareness, or behavior brought about by a brief electrical disturbance in the brain.
Seizures vary from a momentary disruption of the senses, to short periods of unconsciousness or staring spells, to convulsions. Some people have just one type of seizure. Others have more than one type.
Although they look different, all seizures are caused by the same thing: a sudden change in how the cells of the brain send electrical signals to each other.
If you have epilepsy, you probably already know that it's not a mental disorder. It can be caused by anything that affects the brain, including tumors and strokes. Sometimes epilepsy is inherited. Often, no cause can be found.