Epilepsy is a neurological disorder caused by unusual nerve cell activity in the brain. Each year, about 150,000 Americans are diagnosed with the central nervous system disorder that causes seizures. Over a lifetime, one in 26 people will be diagnosed with it.
Seizures can cause a range of symptoms, from momentarily staring blankly to loss of awareness and uncontrollable twitching. Some seizures can be milder than others, but even minor seizures can be dangerous if they occur during activities like swimming or driving.