Facial nerve is a mixed nerve, mainly motor nerve, with only a few sensory nerves, which dominate facial expression muscles. Facial nerve damage can cause facial paralysis. Etiological infection and cold Bell's palsy are usually caused by cold stimulation, and viral infection causes inflammation of nerve sheath, which leads to compression and ischemia of nerve in facial nerve canal. It accounts for about 75% of facial nerve lesions, and 1%-2% can't be cured. Clinically, diseases such as high fever, otitis media and mumps can also cause facial paralysis. Intracranial hemorrhage of brain tumor Intracranial tumors, such as acoustic neuroma, intracranial aneurysm, intracranial vascular accident, compression or invasion of facial nerve center, can cause facial nerve damage to varying degrees. Trauma and surgical injury facial trauma, such as cutting injury and laceration. Surgical injury is mainly caused by accidental injury of facial nerve and tumor erosion, which is difficult to peel off. Symptoms facial paralysis can be divided into central paralysis and peripheral paralysis. Central paralysis mainly occurs in the lower part of the contralateral side, which is characterized by drooping mouth and shallow nasolabial groove. In peripheral lesions, all the facial muscles on the affected side lose their functions. Typical expressions are: drooping mouth, inability to drum cheeks and whistle, incomplete closure of upper and lower eyelids, and disappearance of forehead lines. The treatment method is mainly to make a treatment plan according to the cause. Facial paralysis caused by local inflammation, cold stimulation, virus and fever should not be considered in the early stage. Drug therapy, acupuncture and physical therapy should be carried out as soon as possible, and the changes of the condition should continue to be observed. Surgery can only be performed after 2-3 years. Traumatic injury and intracranial tumor compression should be treated by appropriate surgery as soon as possible. Operation method * facial nerve anastomosis or nerve bridging

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