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Two facial nerves (one on either side of the face) control the muscles used for facial expression, as well as aspects of eye tearing, saliva production, and taste. If they are injured, you may have trouble moving your face, including moving your eyelids or eyebrows, lips, nostrils, or cheeks. Bell’s palsy is the most common cause of facial nerve problems. The condition usually begins suddenly and affects one side of your face. Doctors think a virus causes the facial nerves to swell, which leads to symptoms of Bell’s palsy. Most people recover from Bell’s palsy, but it may take months to regain normal facial movement. Up to 30 percent of patients may have lasting malfunction of some facial muscles. A variety of other medical conditions can affect the facial nerves and cause paralysis: (责任编辑：) |