A convulsion induced by electroconvulsive therapy or a medical treatment for a type of seizure consisting of a series of involuntary contractions of the voluntary muscles.

Besides those occurring in epilepsy, convulsions can also be caused by chemical or hormonal imbalances in the blood; metabolic disturbances; injury to the brain; such as, from head injury, a tumor, or a stroke and numerous other causes; such as, infection, high fever, or cerebral edema (swelling of the brain caused by the accumulation of fluid in the brain substance).