How are tics differentiated from hemifacial spasm?

Updated: Sep 16, 2019
  • Author: Steven Gulevich, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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Facial tics are brief, repetitive, coordinated, semipurposeful movements of grouped facial and neck muscles. Tics may occur physiologically or in association with diffuse encephalopathy. Some medications (ie, anticonvulsants, caffeine, methylphenidate, antiparkinsonian agents) are associated with producing tics. Single, repetitive, stereotyped movements (eg, repetitive grimacing, throat clearing, vocalizations) define a simple tic disorder.

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