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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.
Generalized seizures affect both sides of the brain. Focal seizures affect just one area of the brain. These seizures are also called partial seizures. A person with epilepsy can have more than one kind of seizure. Read more about types of seizures and what they look like.