In neurology, crooked mouth is generally divided into central and peripheral facial palsy, and the specific causes are as follows: 1. Peripheral facial palsy: relatively heavy symptoms, but the condition is not very serious, usually in addition to the crooked mouth, combined with the eyes can not be closed, the main common cause is blowing cold wind or cold air conditioning in summer, the blown side of facial palsy occurs. The treatment usually includes nerve-nourishing drugs, acupuncture, physiotherapy, antiviral treatment, etc. Poor expression muscle on one side is a common sequelae. 2. Central facial palsy: In addition to crooked mouth, accompanied by slurred speech or lack of strength and numbness in the arms and legs, highly suggestive of possible brain problems, such as cerebral hemorrhage or cerebral thrombosis formation, requires timely consultation and head CT or MRI examination to To clarify the cause of the disease. It is difficult to determine the cause of crooked mouth alone, but if there are other combined symptoms, it can be identified initially, and if the identification is not clear, it is recommended to go to the hospital as soon as possible.