Convulsion: A sudden attack usually characterized by loss of consciousness and sustained or rhythmic contractions of some or all voluntary muscles. Convulsions are most often a manifestation of a seizure disorder (epilepsy).
Encephalopathy: Damage to brain tissue.
Malaise: The vague feeling of illness or discomfort.
Ataxia: Failure of muscle coordination.
Tremors: Involuntary trembling.