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Seizures are a symptom of epilepsy. Seizures (fits, convulsions) are episodes of disturbed brain function that cause changes in neuromuscular function, attention, or behavior. They are caused by abnormally excited electrical signals in the brain.
The two main types of seizures are generalized seizures, which affect the whole brain all at once, and partial seizures, in which only part of the brain is involved. Some people with epilepsy have both kinds. Also, the electrical problem in a partial seizure can spread to cause a generalized seizure.