What causes facial muscle spasm? Most of them are caused by pathological disturbance of facial nerve conduction due to some kind of compression. Most patients with facial muscle spasm are due to cross-compression of normal blood vessels, such as compression of posterior inferior cerebellar artery, anterior inferior cerebellar artery, vertebral nerve artery, and occasionally due to compression of facial nerve root by aneurysm, arteriovenous malformation or brain tumor. Therefore, this is one of the causes of induced facial muscle spasm. Very few patients with facial muscle spasm develop the affected facial muscle spasm after traumatic tumors or surgical procedures. It may be due to a short circuit with other brain nerves during the recovery of the facial nerve, and when the other nerves are excited, one side of the facial muscle twitches as well. Some patients with facial spasm have idiopathic facial nerve palsy and develop secondary facial muscle spasms on the affected side after recovery. It may be a pathological change in the demyelination of the nerve due to facial neuritis that has not recovered 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 spasms. In other words, most facial muscle spasms are due to vascular compression of nerves, and the treatment of facial muscle spasms is to resolve the involvement between vessels and nerves, regardless of which causes the facial muscle spasm problem, it can be treated with surgery. Microvascular decompression is indicated for the treatment of all types of facial myospasm. For secondary facial myospasm, after the cause is clearly identified, we should first start to treat the cause of facial myospasm, such as facial neuritis, and if there is good involvement between the vessels and nerves after that, microvascular decompression can still be performed for treatment. The procedure of microvascular decompression does not damage the nerves and blood vessels, it is a special material between the nerves and blood vessels, this material is corrosion resistant and will not be absorbed by the human body, at least during the human life span, so do not worry about the safety of this material, and the material is blocked between the nerves and blood vessels, the blood vessels can no longer compress the nerves, thus fundamentally treating facial muscle spasm. The success rate of the surgery is as high as 98%. If there is no treatment effect after surgery, a second surgery can be performed. It is the best way to treat facial muscle spasm.