This nerve moves the facial muscles, stimulates the salivary and tear glands, enables the front two thirds of the tongue to detect tastes, and controls a muscle involved in hearing. Doctors diagnose hemifacial spasm based on symptoms but do magnetic resonance imaging to check for other disorders that can cause similar symptoms. Hemifacial spasm is treated with botulinum toxin or another drug, but if drugs are ineffective, surgery may be necessary. See also Overview of the Cranial Nerves.

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, but it may be caused by a facial nerve injury or a tumor, or it may not have a cause. 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.

Hemifacial spasm HFS is an involuntary twitching or contraction of the facial muscles on one side of the face. Medication, surgery, and Botox injections are treatment options to stop the spasms and relieve the discomfort. Each treatment offers benefits, but each has limitations. You and your doctor should determine which treatment is best. Hemifacial spasm also called tic convulsif is an involuntary twitching of the facial muscles on one side of the face.

Hemifacial spasm is a condition that affects half of your face. It usually starts with a twitching around one eye. It may gradually involve your mouth also. There are different types of treatment.