My arm began hurting a couple weeks ago not due to any injury that I can think of. A few days later, I realized that when I raised my arm, something was sticking out under my arm pit in my left arm. It was also painful and tight when I raised my arm. After going to the doctor, who had never seen this problem before (but concluded it was a tendon), I was given a steroid shot and 10 days of oral steroids. I am on day 8 and while the pain has lessened, the tendon is still just as tight and there is some pain that remains. I was sent for blood work and another test to make sure I don't have a clot. Do you have any suggestions or thoughts.