Hemifacial spasm is painless involuntary twitching of one side of the face due to malfunction of the 7th cranial nerve (facial nerve). This nerve moves the facial muscles, stimulates the salivary and tear glands, enables the front part of the tongue to detect tastes, and controls a muscle involved in hearing.
Hemifacial spasm affects men and women but is more common among middle-aged and older women.
The spasms may be caused by an abnormally positioned artery or loop of an artery that compresses the 7th cranial nerve where it exits the brain stem.
Muscles on one side of the face twitch involuntarily, usually beginning with the eyelid, then spreading to the cheek and mouth. Twitching may be intermittent at first but may become almost continuous. The disorder is essentially painless but can be embarrassing.
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