Psychological factors can easily trigger facial palsy: Investigation shows that psychological factors are one of the important factors triggering facial nerve palsy. Before the occurrence of facial nerve palsy, a considerable number of patients have physical fatigue, lack of sleep, mental tension and physical discomfort. The root cause of facial palsy lies in the cervical vertebral bones misaligned and skewed to compress the nerve causing nerve spasm and forming facial nerve spasm paralysis, resulting in complete paralysis of facial muscles, loss of forehead wrinkles, enlarged eye fissures, flat nasolabial folds, drooping corners of the mouth, and skewed corners of the mouth to the healthy side when teeth are exposed.