I have pain in my upper arms/shoulders, both left and right, that is worse at night. At times I am unable to lift one or both arms, reach behind me, etc. I have had xrays and MRIs; there is no obvious problem. I did not injure either arm. I am in good physical condition; at the time that the pain started 2 years ago, first in my right shoulder, I regularly did yoga several times a week in addition to other exercise (running, squash, some swimming, strength training). I have tried resting as much as possible, physical therapy, Ibuprofen... I don t know what to do next.