Hemifacial spasm - Symptoms and causes - Mayo Clinic - Facial spasm uncontrolled contraction
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Hemifacial spasm (HFS) is an involuntary twitching or contraction of the facial muscles on one side of the face. Hemifacial spasm (also called tic convulsif) is an involuntary twitching of the facial muscles on one side of the face. Hemifacial spasm can be caused by injury to the. Hemifacial spasm (HFS) is a rare neuromuscular disease characterized by irregular, involuntary muscle contractions (spasms) on one side (hemi-) of the face.