Facial palsy is also known as facial neuritis. The cause of facial palsy should be considered from two perspectives: 1. Chinese medicine perspective: Chinese medicine believes that facial palsy is due to a deficiency of positive energy. The patient feels wind-cold or wind-heat, which invades the facial meridians, causing the facial meridians to be blocked and out of control, eventually causing facial palsy; 2. Western medicine perspective: Western medicine believes that facial palsy is caused by facial nerve injury, i.e. facial neuritis. It is divided into central facial palsy and peripheral facial palsy, and usually refers to peripheral facial palsy, which is caused by damage to the facial nerve and its following facial nerves. The symptoms of facial palsy can be described by four words, namely “mouth and eye distortion”, which actually refers to the patient’s oral and eye symptoms. When patients wake up in the morning to wash their faces and rinse their mouths, they find that their facial muscles are not obedient, and when they puff their cheeks and mouths, their mouths are skewed to one side, often to the healthy side, and sometimes there are symptoms such as drooling; eye symptoms are that the eyes cannot close, the patient’s eyebrows droop and cannot be raised, and when the eyebrows are raised, the patient’s forehead has no wrinkles.