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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.
Primarily generalized seizures can be sub-classified into a number of categories, depending on their behavioural effects: 1  Absence seizures involve an interruption to consciousness where the person experiencing the seizure seems to become vacant and unresponsive for a short period of time (usually up to 30 seconds).