My left arm. When I stretch it out and slightly back, like you do when putting on clothes it hurts in the middle and upper joints! It's been like it for a few weeks and I was hoping it would just go away and that I had probably simply pulled it. Situations that hurt... I have to be really careful when I am reaching for stuff in the back of the car - ouch Reaching for the alarm clock this morning - ouch Getting dressed, left arm - ouch. What the blazes is going on. I am 48. I cycle daily. I am right handed. DOCTOR!!!