A brief change in electrical activity in the brain often leads to seizures. People who have these episodes may lose consciousness, have "blackouts," or experience involuntary arm and leg movements. There are two general types of seizures: partial and generalized. When someone has experienced a seizure, a healthcare provider will usually order an electroencephalogram to determine what type of seizure the person may have had and whether there are any detectable abnormalities in the person's brain waves.
(Click Seizures for more information, including what other symptoms may occur, how the condition is diagnosed, and what causes these episodes. You can also click any of the links in the box to the right for specific information.)