Convulsion

Rapid and uncontrollable shaking of the body.

Spasms, epilepsy.

An involuntary, uncontrollable muscle contraction.

The rapid involuntary contracting and relaxing of the muscles in several parts of the body.

Violent muscular contractions that accompany some kinds of seizures, especially the most disruptive seizures that go under the umbrella name of epilepsy.

Sudden, involuntary, and violent contraction of a group of muscles, sometimes with loss of consciousness. Sometimes called a seizure, it may occur in a seizure disorder (e.g., epilepsy) or after head injury; sometimes caused by high fever in otherwise healthy infants and young children (febrile seizure). Convulsions are also associated with meningitis, brain tumors, and alcohol withdrawal syndrome.

Seizure with a series of sudden, involuntary contractions of muscles of the face, trunk, and extremities.

Involuntary contraction of the voluntary muscles, also called a seizure. Convulsions may affect the entire body or only a part, such as an extremity. The many possible causes include head injury, high fever, drug or alcohol overdose, and disease.

An involuntary contraction of the muscles producing contortion of the body and limbs. Rhythmic convulsions of the limbs are part of grand mal epilepsy. Febrile convulsions are provoked by fever in otherwise healthy infants and young children. An afebrile infantile convulsion is likely to be due to birth injury or a developmental defect of the brain.

Rapidly alternating contractions and relaxations of the muscles, causing irregular movements of the limbs or body generally, usually accompanied by unconsciousness.

Alternating periods of severe muscular contraction and relaxation.

During episodes of seizure, one may experience the occurrence of involuntary contractions in the muscles of the body. These contractions serve as a simultaneous accompaniment to the seizure event.