Mark gets second looks from people because he twitches, shrugs, jerks his shoulders, and flexes his jaw. He can stop doing these things, but not for long. But Mark isn't weird. He has a condition called Tourette syndrome. Tourette syndrome is a condition of the central nervous system that causes tics.
Tics are movements or sounds that are repeated over and over.
A person with Tourette syndrome has very little or no control over twitches, movements, or noises that he makes. Tourette syndrome gets its name from a French doctor named George Gilles de la Tourette, who was the first to fully describe the condition back in 1885. It is sometimes also known as Tourette's syndrome, Tourette disorder, or Gilles de la Tourette syndrome. For specific medical advice, diagnoses, and treatment, consult your doctor.