A tic is a sudden, repetitive, nonrhythmic motor movement or vocalization involving discrete muscle groups. Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing.

Tics must be distinguished from movements of other movement disorders such as chorea, dystonia, myoclonus; movements exhibited in stereotypic movement disorder or some people with autism; and the compulsions of obsessive-compulsive disorder (OCD) and seizure activity.

Read more about Tic:  Description and Classification, Tic Disorders, Differential Diagnosis

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