Chorea, Athetosis, and Hemiballismus By Hector A Gonzalez-Usigli, MD, HE UMAE Centro Médico Nacional de Occidente Reviewed / Revised Feb 2022 | Modified Sep 2022 View Patient Education Chorea is a nonrhythmic, jerky, rapid, nonsuppressible involuntary movement, mostly of the distal muscles and face; movements may be incorporated into semipurposeful acts that mask the involuntary movements.