I have had jaw quivering on and off for close to a year. It wasn't bothersome, but now some people are beginning to notice it. My thyroid was checked by an endocrinologist and is fine. I recently was in the hospital with C-diff. I take attenolol for a fast heart beat and blood pressure. My jaw is noticeable if I drink from a glass, therefore I usually use a straw. I do smoke and am trying to quit, and I noticed it quivering a while ago when I exhaled. That is the first time that was noticeable to me. Any suggestions?