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. Transient tics go away by themselves.