Facial neuritis is not facial palsy, but facial neuritis can easily cause facial palsy in patients. Facial palsy can be clinically divided into central facial palsy and peripheral facial palsy. Peripheral facial palsy is mostly caused by facial neuritis; central facial palsy is mostly caused by cerebrovascular disease. Patients with peripheral facial palsy mainly show loss of frontal lines, enlarged eye fissures, flat nasolabial folds, drooping corners of the mouth, and the face being drawn toward the healthy side, with the affected side being unable to perform actions such as frowning, frowning, closing the eyes and showing the teeth, puffing and whistling. When the patient closes the eyes, the eyes on the paralyzed side may turn inward and upward, revealing the white sclera under the cornea, also known clinically as Bell’s phenomenon, and when puffing and whistling, the affected side of the mouth leaks air because the lips cannot be closed. The main difference between patients with central facial palsy and peripheral facial palsy is that the frontal lines are basically symmetrical.