Etiology 1, infectious changes: infectious changes are mostly caused by the activation of dormant herpes zoster latent in the sensory ganglia of the facial nerve; 2, auricular diseases; 3, tumors; 4, neurogenic; 5, traumatic; 6, poisoning: such as alcohol poisoning. Long-term exposure to toxic substances; 7, metabolic disorders: such as diabetes mellitus, vitamin deficiencies; 8, vascular insufficiency; 9, congenital facial nerve nucleus hypoplasia. Predisposing factors: Viral infection, cold, fatigue, trauma, etc. Self-exercise Acupressure (for early stage of facial paralysis): The patient can carry out passive movement of the facial muscles, and massage along the side of the cheeks to the forehead to the nose in a circular clockwise manner. Because the facial muscles are very thin, the massage should be moderate, twice a day, massaging the Shang Guan, Xi Guan, Fei Feng, Da Ying, Yang Bai and Ying Xiang points for 5-15 minutes each time. Expression training (for when nerve function begins to recover): Cheek puffing exercise: mouth tightly closed, cheeks inflated like a balloon, pause for a few seconds and then restore, do 10 times. Lift the forehead and close the eyes: lift the forehead forcefully, make the frontalis muscle movement, the frontalis transverse stripe appears; close the eyes forcefully, practice the orbicularis oculi muscle of the affected side, alternate between the two movements, do 10 times. Frowning exercise: frown forcefully, so that the left and right eyebrows close, between the eyebrows to produce longitudinal wrinkles, stop for a few seconds after the restoration, do 10 times. Pouting exercise: make the mouth pout to exercise the facial muscles, pause for a few seconds and then restore, do 10 times. Show teeth exercise: slightly open the lips, upper and lower teeth bite, in order to exercise the cheek muscles, stop for a few seconds and then restore, do 10 times.