Hemifacial spasm is a neuromuscular disorder that causes frequent involuntary contractions to occur in the muscles on one side of the face.

Hemifacial spasm doesn't have a specific cause. It may occur as a result of:

  • A blood vessel pressing on the facial nerve
  • Tumor
  • Facial nerve injury
  • Bony or other abnormalities that compress the nerve

Muscles of the Face
Muscles of the Face
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