Bell's palsy is caused by a decrease in the body's resistance, resulting in damage to the facial nerve. This damage presents clinically as symptoms of viral infection. Therefore, precautions should be based on its cause and clinical symptoms. In terms of causes, patients should enhance their resistance, engage in more physical exercise, consume foods that eliminate free radicals, and enhance their diet with high-quality protein. When going out, avoid cold exposure, wind, and re-infection. In terms of treatment, patients should adhere to medical advice and take oral medications on time. Additionally, after treatment, rehabilitation should be emphasized to prevent residual symptoms. Thus, the symptoms of Bell's palsy involve a range of conditions.