Facial palsy is also known as facial palsy, which is divided into central facial palsy and peripheral facial palsy according to the location of facial nerve injury. In central facial palsy, the lesion is in the brain, and the clinical manifestation is only the asymmetry of the nasolabial folds when grimacing, which affects the chewing action, while the facial muscles above the eyes are not affected, i.e., frowning, eye lifting and eye closing actions are not affected, and bilateral frontal lines exist when the eyes look upward. In peripheral facial palsy, the lesion is in the nucleus of the facial nerve and the peripheral facial nerve, the clinical manifestations are paralysis of the upper and lower facial muscles on the same side of the lesion; the frontal lines on the lesion side become shallow or even disappear, the frown cannot be frowned, the eye fissure becomes larger, the eyebrows are high and low when looking upward, the eyebrows on the lesion side cannot be raised; the eyes on the lesion side cannot be closed when closing the eyes hard, and the eyeballs turn upward when closing hard again, and the phenomenon of white eyes appears Some patients also have hearing allergy and reduced sense of taste. The causes of central facial palsy and peripheral facial palsy are different. The common causes of central facial palsy are cerebrovascular disease, tumor, intracranial infection, etc., which are often more serious, while the common causes of peripheral facial palsy are idiopathic facial nerve paralysis, viral infection, cold stimulation, trauma, etc. Different treatment methods are available for different causes. When crooked mouth occurs, the first thing we should do is to go to the neurology department of the hospital immediately and clarify the cause as soon as possible with the help of the doctor.