Gilles de la Tourette syndrome or Tourette syndrome (TS) is a neurological disorder characterized by sudden, brief, repetitive, involuntary (unwanted) movements or vocal sounds called tics. They can range from mild to severe. Severe symptoms might significantly interfere with communication, daily activities and quality of life. Tics can be classified as: Simple tics: they involve a limited number of muscles. Complex tics: they involve several muscle groups. Motor tics in TS