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Facial paralysis involves a loss of voluntary muscle movement within the face. The facial nerve stretches down each side of the face and allows a person to laugh, cry, smile or frown when functioning properly. Facial paralysis occurs when a person is unable to move all or some of the muscles on one or both sides of the face. Facial paralysis may be the result of damage to the facial nerve or to the area of the brain that sends signals to the muscle of the face.