Facial nerve paralysis is mainly caused by the following reasons: 1, cerebrovascular disease, mostly due to the facial nerve nucleus and facial nerve nucleus above the cortical brainstem bundles damage, will be manifested as a facial muscle paralysis, with the central tongue paralysis. The main features of central facial paralysis are paralysis of the expression muscles below the eye fissure and shallow nasolabial folds.2. Diseases that cause facial nerve paralysis include peripheral facial paralysis, which refers to paralysis of one side of the face when the facial nerve in the extracranial section is attacked by a virus or when inflammatory edema occurs. In this case, the patient will have facial paralysis on one side of the face, and the frontal lines above the eye cracks will become shallow.3. Considering intracranial tumors and intracranial space occupation, such as compression of the brainstem, which leads to compression of the facial nerve, facial paralysis can also occur.