The high incidence of facial myospasm is common in life, in fact, most people do not know much about the causes that trigger the appearance of facial myospasm. Next, let’s explore together from the following article how the formation of the following myospasm is it. 1, due to some kind of compression so that the facial nerve conduction pathological interference caused by the majority of patients with facial muscle spasm is due to normal vascular cross compression, such as the posterior inferior cerebellar artery, anterior inferior cerebellar artery, vertebral nerve artery compression, occasionally due to aneurysms, arteriovenous malformations or brain tumors and other facial nerve root compression. Therefore, this is one of the causes of induced facial muscle spasm. 2, Some patients with facial muscle spasm are idiopathic facial nerve paralysis, and secondary facial muscle spasm of the affected side appears after recovery. It is possible that the pathological changes of nerve demyelination caused by facial neuritis have failed to return to normal. There is still partial demyelination, which makes the electrical conduction of the facial nerve susceptible to generalization, or facial neuritis involves the nerve nuclei in the brainstem, forming an epilepsy-like foci and producing seizure-like twitching of the facial muscles. This is one of the causes of facial muscle spasm. 3, a very small number of patients with facial muscle spasm for traumatic tumor or after surgical operation appeared affected facial muscle spasm. It may be that the recovery process of the facial nerve is short-circuited with other brain nerves, and when other nerves are excited, one side of the facial muscle twitching also occurs.