I started to lift weights about 6 months and about 2 or 3 months ago I started to hear a click or pop noise in the back of my head. Does anybody know if this could be caused by a disc or my spine or anything like that. At first I thougt it could be a nuerological problem, but know I think it could have something to do with my spine. I am only 21. Does anybody have any suggetions.