There are various causes of facial paralysis, and according to the location of the damage, it can be categorized into central facial paralysis and peripheral facial paralysis. Central facial palsy lesions are located above the facial nerve nucleus to the cerebral cortex and are usually caused by cerebrovascular disease, intracranial tumors, and traumatic brain injury. Peripheral facial palsy occurs in the facial nucleus and facial nerve. Peripheral facial palsy is more common. Common causes of peripheral facial paralysis include: 1. Idiopathic facial nerve palsy: The main type of facial nerve palsy is idiopathic facial nerve palsy, often called Bell’s palsy, which accounts for 60% to 75% of all facial nerve palsy cases. The most common is unilateral facial nerve palsy, the degree of facial nerve palsy can be complete or incomplete paralysis, consider this diagnosis after excluding other causes. Infection: Infection is the 2nd most common cause of facial nerve palsy. Common causes of infection include viruses, spirochetes and bacteria. This type of facial nerve palsy accounts for 12% of all facial nerve palsies. Facial nerve palsy can also be secondary to middle ear infections. Otitis media without timely treatment can also cause facial nerve palsy. Tumor: Tumor is the second most common cause of facial nerve palsy after infection, and about 5% of patients with facial nerve palsy are caused by tumors. These tumors include acoustic neuroma, parotid adenoma, primary cholesteatoma and jugular bulb tumor. Under abnormal circumstances, both the tumor itself and surgical removal of the tumor can cause facial nerve palsy. 4.Others: autoimmune reactions, tumors, metabolic disorders, such as diabetes, vitamin deficiencies, etc. may lead to facial paralysis, but are less common than other causes. In conclusion, there are various causes of facial paralysis, first of all, it is necessary to distinguish between peripheral facial paralysis and central facial paralysis, and then to distinguish the cause of the lesion, you should go to the regular medical institutions in a timely manner, a clear diagnosis, and take targeted treatment in a timely manner.