Tourette Syndrome is a hereditary neurological movement disorder that is characterized by repetitive motor and vocal tics. Symptoms may include involuntary movements of the extremities, shoulders, and face accompanied by uncontrollable sounds and, in some cases, inappropriate words. Tourette Syndrome is neither a progressive nor degenerative disorder; rather, symptoms tend to be variable and follow a chronic waxing and waning course throughout an otherwise normal life span. The specific symptoms associated with Tourette Syndrome often vary greatly from case to case. The exact cause of Tourette Syndrome is unknown.
webmd.com, retrieved 04/16/2016 from http://www.webmd.com/brain/tourette-syndrome-nord