Why Is My Face Twitching? | Right as Rain by UW Medicine - Facial muscle spasm
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Hemifacial spasm is a nervous system disorder in which the muscles on one side of your face twitch involuntarily. Hemifacial spasm is most often caused by a blood vessel touching a facial nerve. It can also be caused by a facial nerve injury or a tumor. Facial twitch or hemifacial spasm (HFS) is an involuntary twitching or contraction of the facial muscles on one side of the face. Symptoms, causes, diagnosis.