Facial myoclonus is a relatively common cranial nerve disorder, which mainly manifests as paroxysmal involuntary twitching of one side of the face. Some patients ask whether facial myospasm can cause a crooked mouth. For this question, we have to look at the symptoms of facial muscle spasm. Facial myospasm is a disease that begins with a fluttering eyelid on one side, and gradually expands with the development of the disease to twitching at the corners of the mouth, twitching of the nose, and even serious twitching of the neck muscles. Therefore, a crooked mouth is indeed a typical symptom of facial myasthenia gravis. Facial myospasm has very serious hazards, not only will it cause abnormal throbbing of the patient’s face, which is very tormented; but also because of this external symptom, it will cause great damage to the patient’s heart and spirit. Some patients may even become depressed or even commit suicide as a result. Therefore, it is important to seek medical treatment for facial myoclonus in a timely manner. For the treatment of facial muscle spasm, most local hospitals tend to adopt conservative medical treatment methods, such as taking medication, acupuncture, or botulinum toxin injections. However, these treatments often treat the symptoms but not the root cause, and may relieve the symptoms in the short term, but later they will come back, and may also produce some side effects, which are very harmful to the body. These treatments are generally not recommended. At present, we carry out microvascular decompression surgery to treat facial myoclonus, and the results are remarkable and generally recognized and praised by patients and their families. The surgery is performed by making a 3~5 cm incision behind the ear, probing the anatomical relationship between the vascular nerves of the facial nerve roots, searching for the responsible vessels that are compressing the facial nerve roots, and isolating them with special medical spacers to release the compression so as to achieve the treatment purpose, which is minimally invasive, less traumatic, quick recovery and effective.