As long as I can remember, my grandfather has always had a stiff neck to the point where he can t turn his head side to side at all. He can extend, flex, and hyperextend his neck somewhat but can t abduct or rotate his head at all. As he gets older he has been complaining of headaches, and pain medication is no longer masking the pain. The only thing I can think of is tightening of his sternocleidomastoid muscle and using massage and stretching to help with the pain. What do you think? Do you think it is something more and what would you recommend for treatment.