Hemifacial spasm (HS) causes muscles to contract on one side of the face. A person cannot control the spasm.
HS does not always have a cause. It may be due to:
Muscles of the Face
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HS is more common in older women. It is also more common in people who are Asian.
Problems may be:
The doctor will ask about your symptoms and health history. A physical exam will be done. It will focus on the face.
Images of the head may be taken. This can be done with:
Nerve and muscle function may be tested. This can be done with electromyography (EMG).
The goal of treatment is to ease pressure on the nerve. This can be done with:
Some people may need surgery to reposition a blood vessel that is pressing on a nerve.
There are no known guidelines to prevent this problem.
National Institute of Neurological Disorders and Stroke
National Organization for Rare Disorders
Canadian Movement Disorder Group
Chaudhry N, Srivrastava A, et al. Hemifacial spasm: the past, present, and future. J Neurol Sci. 2015;356(1-2):27-31.
Hemifacial spasm information page. National Institute of Neurological Disorders and Stroke website. Available at: https://www.ninds.nih.gov/disorders/all-disorders/hemifacial-spasm-information-page. Accessed October 14, 2020.
OnabotulinumtoxinA. EBSCO DynaMed website. Available at: https://www.dynamed.com/drug-monograph/onabotulinumtoxina. Accessed October 14, 2020.
Last reviewed September 2020 by
EBSCO Medical Review Board
Teresa Briedwell, PT, DPT
Last Updated: 6/4/2021