A tic is a problem in which a part of the body moves repeatedly, quickly, suddenly, and uncontrollably.
Tics can occur in any body part, such as the face, hands, or legs.
They can be stopped voluntarily for brief periods. Sounds that are made involuntarily are called vocal tics. Most tics are mild and hardly noticeable. However, in some cases they are frequent and severe and can affect many areas of a child's life. Children with Tourette's disorder have both body and vocal tics.