Bell’s Palsy is a sudden, temporary paralysis or weakness of the muscles in your face. It is caused by inflammation of the facial nerve and only affects one side of the face. What causes Bell’s Palsy? The exact cause is unknown but is often linked to viral infections. Signs of Bell’s Palsy Sudden onset of one-sided facial weakness. Drooping of the eyelid or inability to close the eye. Drooling and difficulty eating or drinking. Increased sound sensitivity. Pain on the side o