Facial nerve injury, also called facial nerve palsy, is a disease in which the facial expression muscles on one or both sides of the face are paralyzed resulting in the inability to frown, frown on the forehead, close the eyes, show the teeth, or puff the cheeks on the sick side. The result of untreated facial nerve palsy is disfigurement. The cause of facial nerve palsy varies from one facial nerve palsy to another, the most common being facial neuritis, also known as BELL palsy, which accounts for more than 95% of clinical facial nerve palsy. The etiology of facial neuritis is not entirely clear, and may be related to the following factors: 1, viral infection is the most important causative factor, but the virus can rarely be isolated; 2, autoimmune abnormalities, the facial nerve is susceptible to inflammatory changes when immunity is abnormal, for patients with recurrent facial neuritis intrinsic factors are the dominant type; 3, tumor compression; 4, brainstem hemorrhage or infarction; 5, craniocerebral trauma; 6, Septic inflammation, such as otitis media, mastoiditis, parotitis or inflammatory infections of the auricle or root of the ear, can affect the trunk or branches of the facial nerve to produce lesions.