The most common cause of facial palsy is facial neuritis, and most patients with mild symptoms recover gradually over a period of weeks or months. Facial neuritis is a paralysis of the facial muscles due to nonspecific verification of the facial nerve in the foramen caudalis. It can develop at any age. It is mostly unilateral and rarely bilateral. The main manifestations are sudden paralysis of the facial expression muscles on one side, shallowing of the frontal lines, inability to frown, low hanging of the corners of the mouth on one side, inability to make pouting movements, air leakage from the corners of the mouth when doing cheek puffs, and food often being retained between the teeth and cheeks. The pathogenesis is unknown, but it is generally believed that the main cause is related to the immune response triggered by viral infection. Treatment can improve microcirculation, nerve nutrition, antiviral, acupuncture, physical therapy, etc. Most patients with facial neuritis can be cured with prompt medical attention. Patients with complete facial palsy generally require longer recovery time, 2-8 months or even 1 year to recover, and often leave sequelae. When facial palsy occurs, it is recommended to go to the neurology department of the hospital in time to improve the relevant examination to clarify the specific cause and then actively target treatment.