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Hemifacial Spasm (HFS)

Causes of Hemifacial Spasm (HFS)

In most cases, what causes hemifacial spasm is pressure exerted by a blood vessel on the facial nerve where it exits the brain stem. The problem may result from a tumor or because of injury to the face, but in some cases has no apparent cause. In some rare cases, spasms affect both sides of the face, a condition known as blepharospasm, which may be mistaken for hemifacial spasm.

Locations for Hemifacial Spasm (HFS)