12+ muscles are connected to each shoulder. It takes delicate and synchronized cooperation among these muscles, the 3 bones involved, the ligaments and associated structures for healthy function of the joint. If/when that is missing, then the dreaded shoulder pain appears. The cause of shoulder pain could be one or more issues going on at the same time. Massage Therapy helps in gaining range of motion and relieving pain. If the cause is due to structural issue, best thing to do is consult a specialist.