Seizures occur when there is a sudden, brief change in electrical activity in the brain. These episodes can be caused by epilepsy, stroke, or an imbalance of body fluids or chemicals. There are many types of seizures, each with its own symptoms, but common symptoms may include involuntary movement of arms and legs, "blackouts" or periods of confused memory, and fainting spells. If a person has had two or more seizures, he or she is often diagnosed with epilepsy.
(Click Seizures to learn more about the causes, symptoms, and diagnosis of this condition. You can also click any of the links in the box to the right for specific information.)