Facial muscle spasm, also known as facial muscle twitch or hemifacial spasm, manifests as paroxysmal involuntary twitching of the hemifacial muscles, which is an intermittent, involuntary, irregular and clonic-like contraction of the facial muscles. Usually the twitching is confined to one side of the face, and colloquially facial spasm is a unilateral facial twitch. Typical facial spasms present with spasticity beginning in the orbicularis oculi and progressing downward to involve the orbicularis oris, buccinator, and/or vastus cervicis muscles. Typical facial spasms account for 96% of cases. Atypical facial spasms are rare, with spastic symptoms starting in the orbicularis oris and buccal muscles and progressing upward to involve the orbicularis oculi. Atypical facial spasms account for 4% of cases. There are two main theories about the pathogenesis of facial myospasm: 1. Peripheral theory: It is believed that the compression of nerve roots by blood vessels squeezes nerve fibers together, causing pseudosynaptic formation between adjacent nerve fibers, resulting in a “short circuit” and causing facial myospasm. 2. 2. Central theory: It is believed that the main cause of facial muscle spasm is the increased excitability of the facial nucleus, and the normal afferent impulses become efferent impulses via the facial nucleus, causing facial muscle spasm. Facial muscle spasm is divided into three types according to the degree of spasm: mild: only the orbicularis oculi muscle is involved. Moderate: between mild and severe, including mouth deviation. Severe: complete eye closure, mouth deviation, and involvement of the broad neck muscles during the attack. There is no effective conservative treatment for facial muscle spasm, and electrophysiologically monitored microvascular decompression surgery is the only treatment that can cure it. Of course, if you suffer from facial spasm, you can also try the following treatment options: 1, botulinum toxin local injection, easy to operate, the majority of patients can effectively control the symptoms of facial spasm, the shortcomings: every 3-6 months relapse, the need to receive treatment again; 2, you can also apply carbamazepine under the guidance of the doctor, from a small dose to gradually increase the amount, for some patients effective, but can not be cured. Be alert to adverse drug reactions.