If you experience a loss of consciousness, convulsions, temporary abnormal sensations, or visual disturbances, you may be having a seizure. These episodes are caused by a change in electrical activity in the brain. Some types of seizures are caused by an imbalance of body fluids or chemicals, such as low blood sugar in people with diabetes, or by alcohol or drug withdrawal. If a person has two or more seizures, he or she is often diagnosed as having epilepsy.
(Click Seizures for more information about what causes seizures, information on how this condition is diagnosed, and the various types of seizures. You can also click any of the links in the box to the right for specific information.)