Chorea is a disorder of the nervous system characterized by abnormal, non-repetitive, involuntary movements of the limbs, body, and face. It may start with clumsiness, but later uncontrollable and bizarre movements occur. Chorea is a disease of basal ganglia. Sydenham's chorea, or Saint Vitus' dance, is a childhood illness associated with streptococcus infection, and rheumatic fever; recovery is usually full. Huntington's disease (Huntington's chorea) is a rare hereditary condition, usually coming on in middle age and associated with progressive dementia.