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Doctors usually can diagnose Bell's palsy based on a physical examination. Your doctor will test for weakness in the muscles of the face, paying special attention to your ability to close both eyes and hold them closed. He or she also will ask you to smile or whistle to look for a difference on the two sides of your face. Your doctor will ask whether you are having any symptoms of numbness or weakness in other body parts or difficulty walking. These symptoms are not associated with Bell's palsy, but this will help to rule out other causes of facial weakness.