 [ Symptoms ] what causes pain when you lower your arm after raising it  i injured my arm lifting a box of books had an xray which showed only some arthritis have had some problem with pain in my shoulder when sleeping on it in the past it is my right shoulder [ Disease ] if u need something quick and effective u can try standing in a corner facing the wall with your arms up and strech your pectoralis muscles also do daily strengthening of your middle fibers of trapezius