Tourette syndrome (TS) is a neurological disorder characterized by repetitive, stereotyped, involuntary movements and vocalizations called tics. Tics come and go over time, varying in type, frequency, location, and severity. The first symptoms usually occur in the head and neck area, and may progress to include muscles of the trunk and extremities. Motor tics generally precede the development of vocal tics, and simple tics often precede complex tics. Most patients experience peak tic severity before their mid-teens, with improvement in the late teen years and early adulthood. Approximately 10 percent of those affected have a progressive or disabling course that lasts into adulthood.
This information is based on source information from the National Institute of Neurological Disorders and Stroke.