Tic

A tic is a sudden body movement that a person can't control.  It might be a jerking movement of the hand, or blinking a lot, or a throat sound.Leckman JF, Bloch MH, King RA, Scahill L. "Phenomenology of tics and natural history of tic disorders". Adv Neurol. 2006;99:1–16. PMID 16536348American Psychiatric Association (2000). DSM-IV-TR: Tourette's Disorder.  Diagnostic and Statistical Manual of Mental Disorders, 4th ed., text revision (DSM-IV-TR), . Available at BehaveNet.com Retrieved on 16 September 2015.  Even if the person is told that they are doing it, they usually can't stop. Sometimes if they try really hard, they can make the tic go away for a little bit, but they can't make it go away all the time. in most case's tics are not harmful but it can become so if physical movement becomes involved

Tics can be either "motor tics" or "phonic tics." If they are "motor tics" it means they're movements, like blinking or shrugging shoulders. If they are "phonic tics" it means they're sounds, like clearing your throat, sniffing, or yelling.

Tics are common in childhood, four to twelve percent of all children have tics. Very often this is transitory, tics rarely last longer than six months. Boys have tics more often than girls. About three times more boys than girls have tics. Sometimes, people can have a "tic" in the family, meaning that more than one member has a tic, or that a parent used to have a tic.

Some tics can be treated, usually with behaviour therapy. In cases where the tic is difficult to treat, antipsychotics are sometimes used.

Tics are part of the obsessive-compulsive complex of behavioural disorders,

 References 

Category:Medical signs
Category:Human behavior