Which patient groups have the highest prevalence of hemifacial spasm?

Updated: Sep 16, 2019
  • Author: Steven Gulevich, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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Hemifacial spasm affects all races equally. There is a slight female preponderance. Idiopathic hemifacial spasm typically begins in the fifth or sixth decade of life. Onset of hemifacial spasm in patients younger than 40 years is unusual and often heralds an underlying neurologic illness (eg, multiple sclerosis).

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