Hemifacial spasm is a nervous system disorder in which the muscles on one side of your face twitch involuntarily. Hemifacial spasm may be caused by a blood vessel touching a facial nerve, a facial nerve injury or a tumor, or it may not have a cause.

Hemifacial spasm care at Mayo Clinic

Sept. 19, 2014
  1. NINDS hemifacial spasm information page. National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/hemifacial_spasm/hemifacial_spasm.htm. Accessed Aug. 4, 2014.
  2. Hemifacial spasm. The Merck Manual for Health Care Professionals. http://www.merckmanuals.com/professional/neurologic_disorders/neuro-phthalmologic_and_cranial_nerve_disorders/hemifacial_spasm.html. Accessed Aug. 4, 2014.
  3. Nguyen TT, et al. Nonepileptic paroxysmal disorders in adolescents and adults. http://www.uptodate.com/home. Accessed Aug. 4, 2014.
  4. Cook AJ. Decision Support System. Mayo Clinic, Rochester, Minn. July 9, 2014.