1. Infection: Most diseases are caused by dormant herpes zoster being activated. In addition, otogenic diseases, influenza, mumps, meningitis and local infections can also cause facial paralysis.

2. Tumors: including acoustic neuroma, parotid tumor, primary cholesteatoma, basilar aneurysm and other tumors themselves, as well as surgical resection of tumors can cause facial paralysis.

3. Neurotic. Facial paralysis is mainly caused by non-traumatic intracranial neurogenesis and cerebrovascular diseases.

4. trauma. Facial paralysis is caused by temporal bone fracture, skull base fracture, surgery, facial trauma and injection of neurotoxic drugs in facial nerve distribution area.

5, metabolic disorders: such as vitamin deficiency, diabetes and so on. It can also cause facial paralysis.