Tics are sudden, rapid, non-rhytmic, repetitive, motor movements or vocalizations. The mean age of onset is approximately 5 years old.
Tourette's syndrome is the most common form of tic disorder.
There is a strong genetic component showing a 10- to 100-fold increase in the rates of tics and Tourette's syndrome among first-degree relatives of Tourette's syndrome patients.
Simple motor tics are restricted to a single or a few muscle groups and last less than a fraction of a second.
Complex motor tics involve larger muscle groups, usually last longer and appear purposeful and goal-directed.

Tourette's Syndrome & Other Tic Disorders References

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  4. Cavanna AE, Eddy CM, Mitchell R, et al. An approach to deep brain stimulation for severe treatment-refractory Tourette syndrome: the UK perspective. Br J Neurosurg. 2011 Feb;25(1):38-44. PMID: 21158507
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  22. Porta M, Sassi M, Cavallazzi M, et al. Tourette’s syndrome and role of tetrabenazine: review and personal experience. Clin Drug Investig. 2008;28(7):443-459. PMID: 18544005
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