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, 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. The disease occurs mostly after middle age and is commonly seen in women. Facial myasthenia can be divided into two types, one is primary facial myasthenia and the other is secondary facial myasthenia, i.e. facial myasthenia arising from the sequelae of facial paralysis. The two types can be distinguished from each other in terms of symptoms. Primary facial myospasm can occur even at rest, and the spasm is relieved after several minutes and is uncontrolled; facial myospasm produced by the sequelae of facial palsy is produced only when doing actions such as blinking and raising eyebrows. Diagnosis: 1, involuntary twitching of one side of the facial muscles that cannot be controlled by the independent will, bilateral facial muscles or eyelid twitching are mostly not considered facial muscle spasm. 2, aggravated by stress or fatigue, emotional excitement, alcohol consumption, etc. 3, Typical facial muscle spasm usually starts from the eyelids and gradually expands to the lower face, with symptoms worsening with mood swings, fatigue, and insomnia. If you do not get timely and effective treatment, facial muscle twitching has a tendency to gradually worsen, and in severe cases, eating and seeing will be affected, and you will become irritable, irritable and hypersensitive. 4 .No other symptoms and signs. 5 .Conventional CT or MR examination generally has no positive findings, and special facial nerve MRI examination can mostly find vascular compression and contact in the area of facial nerve out of brainstem.