causes of palsy
Bell's palsy is the most common cause of facial paralysis and it usually causes paralysis on just one side of the face. But what causes Bellâs palsy? Scientists think that Bellâs palsy may be caused by a viral infection that makes the facial nerve swell or become inflamed, according to the National Institute of Neurological Disorders and Stroke. Herpes viruses, which can inflame the nerves, have been associated with causing Bellâs palsy.