What are the causes of facial paralysis?

The causes of facial paralysis are diverse, mainly including the following aspects: 1. **Viral infection**: Such as herpes zoster virus activation leading to facial neuritis, which is one of the most common causes. When the body's immunity decreases, the virus may invade the facial nerve, causing facial neuritis or Bell's palsy. 2. **Trauma**: Facial injuries such as those from traffic accidents, falls, or fights, as well as skull base fractures and surgical procedures, may damage the facial nerve, resulting in facial paralysis. 3. **Neurological diseases**: Conditions such as meningitis, encephalitis, and stroke can damage the facial nerve and affect its normal function. 4. **Ear diseases**: Otitis media, ear tumors, and similar conditions may compress the facial nerve, leading to facial paralysis. 5. **Metabolic disorders**: Conditions such as diabetes and vitamin deficiencies may, over time, affect the normal functioning of the facial nerve. 6. **Autoimmune reactions**: Certain autoimmune diseases may damage the facial nerve, leading to facial paralysis.