Hemifacial spasm (HFS), also known as facial muscle twitching, presents as involuntary twitching of one side of the face. The twitching is paroxysmal and irregular, with varying degrees of intensity, and may be aggravated by fatigue, stress, and voluntary movements. The onset of the twitching mostly starts from the orbicularis oculi muscle and then involves the whole face. This disease occurs mostly after middle age and is common in women: 1, involuntary twitching of one side of the facial muscles that cannot be controlled by independent will, bilateral facial muscle or eyelid twitching is definitely not facial muscle spasm; 2, aggravated by stress or fatigue, emotional excitement, alcohol consumption, etc.; 3, typical facial muscle spasm usually starts from the eyelid twitching and gradually expands to the lower face, with symptoms aggravated by mood swings, fatigue, and insomnia. If no timely and effective treatment is received, facial muscle twitching has a tendency to gradually worsen, and in severe cases, eating and seeing will be affected, becoming irritable, irritable, and hypersensitive; 4, there are no other symptoms and signs; 5, conventional CT or MR examinations generally have no positive findings, and special MRI examinations can mostly find vascular compression and contact in the area of the facial nerve out of the brainstem (the cause of facial muscle spasm).