Liz said:

>>...I've been working in the garden today - using power tools, lifting timber and iron frames, big pots of dirt... no problems at all. Whilst trying to undress, reaching behind to undo bra straps as I always do, it hurts. It's my arm that hurts, not the shoulder or elbow joints, which is what makes me think it's muscular.<<<

I've a simple solution for that - get a front closing bra! I have some problems with joint pain and I switched over to a posture bra that closes in the front and it made a huge difference. it helps you sit up straighter, is easier to get on and off and makes the girls look perkier! Only drawback is they usally come with at least 4 hooks - not sexy.