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A convulsion is a medical condition where the body muscles contract and relax rapidly and repeatedly, resulting in uncontrolled shaking. Because epileptic seizures typically include convulsions, the term convulsion is sometimes used as a synonym for seizure. However, not all epileptic seizures produce convulsions, and not all convulsions are caused by epileptic seizures. Non-epileptic convulsions have no relation with epilepsy, and are caused by non-epileptic seizures.
Convulsions can be caused by epilepsy, infections, brain trauma, or other medical conditions. They can also occur from an electric shock or improperly enriched air for scuba diving.
The word fit is sometimes used to mean a convulsion or epileptic seizure.