Why is the onset of facial spasm unilateral? Observe the facial spasm patients in life can be seen, facial spasm is mostly unilateral onset, usually only one side will appear facial spasm symptoms, this is why? This is actually related to what can trigger facial muscle spasm. Facial muscle spasm is a common neurological disease, most patients by the bridge cerebellar angle vascular compression of the nerve root caused by some patients by tumors, inflammation or facial neuritis caused. The mechanism is not clear, but it is presumed to be related to genetics. Unilateral onset: Medical research shows that the most common cause of facial muscle spasm is the compression of the facial nerve root by blood vessels. The facial muscles on the left and right sides are controlled by two facial nerves, and both nerves are rarely compressed at the same time, so facial muscle spasms tend to develop unilaterally. For example, in the early stage, one side of the eyelid jumps, but after it becomes severe, not only the eyelid jumps, but also the corners of the mouth on the same side will follow the twitching, and some people even have ipsilateral tinnitus and jaw twitching, but rarely both sides jump. It is very rare to see bilateral facial muscle spasms. If there is, it often starts on both sides one after the other, and after the twitching stops on one side, the other side has another seizure, and the twitching is light on one side and light on the other side, and the simultaneous onset and twitching on both sides has not been reported. A few patients have mild facial pain during twitching, and individual cases may be accompanied by ipsilateral headache and tinnitus. Therefore, facial myoclonus manifests as paroxysmal, irregular, involuntary twitching of the hemilateral face. In other words, most of the causative factors of facial myospasm are due to vascular compression of nerves. And it is a progressive disease that will only worsen and not heal itself over time. If left untreated, although not life-threatening, some patients will lead to paralysis of the affected facial muscles, so do not underestimate the facial muscle spasm, must be timely medical treatment. How to treat facial muscle spasm: Facial muscle spasm is generally not recommended for Chinese medicine treatment. Chinese medicine treatment for the treatment of facial muscle spasm only has a certain auxiliary effect, such as Chinese medicine physical therapy, such as massage, massage, physiotherapy, acupuncture, etc., and usually, can not play the fundamental purpose of a complete cure. Western medicine can relieve pain to some extent, such as carbamazepine. But again, they cannot provide a complete cure. If you want to cure facial spasm completely, so it is still recommended to choose the surgical way to treat it. Microvascular decompression refers to the magnification and reoperation of the intracranial nerve vessels through a high-powered microscope, placing a spacer between the nerve and the vessel, thus releasing the compression of the vessel on the root of the facial nerve and restoring the normal function of the facial nerve. This technique has the advantages of minimally invasive, high safety and low recurrence rate. It is also the only surgical procedure that can completely treat facial spasm.