Half of the face is crooked is the occurrence of facial paralysis. There are two possibilities for this kind of facial paralysis: 1. Central facial paralysis, mostly seen in organic diseases of the brain, the most common is cerebrovascular disease, including cerebral infarction and cerebral hemorrhage, and there are other things like brain tumor, encephalitis, and traumatic injury of the brain, all of which can lead to central facial paralysis. Treatment should be tailored to the cause of the disease. In case of cerebral infarction, antiplatelet aggregation, activation of blood stasis, and nerve nutrition are needed; in case of cerebral hemorrhage, dehydration is needed to reduce intracranial pressure, brain cell edema, and nerve nutrition; in case of brain tumors, it is necessary to consider whether neurosurgery is needed; and in case of traumatic brain injuries, the decision of whether to treat the disease by surgical operation or conservative treatment should be made according to the seriousness of the disease.2 Peripheral facial palsy is most commonly seen in idiopathic facial Peripheral facial paralysis is most commonly caused by idiopathic facial neuritis, which is a kind of non-specific inflammation of facial nerve, often induced by wind, cold or viral infection. It is often triggered by wind, cold or viral infections. The treatment should be early use of hormones and vitamin B1 and B12 to nourish the nerves, and combined with rehabilitation in the later stage of treatment.