Liz, my arm hurt rather than my shoulder too...because the ligaments were catching on the bone spur. Eventually, as it went undiagnosed for so long, the bone started sawing though the ligaments, got quite lots painful then.

It only hurt in some positions, classically trying to do up or undo a bra strap and as time went by, other postitions like changing gear in the car or putting my arm over my head, otherwise business as normal. Really... needs checking out, honest. Have I ever lied to you?