I have been having pain/ tenderness in my upper left arm for about 3 weeks now. This is different from other pains I have had and it does not seem to be getting better. I also started having problems with stiffness in my fingers to the point in the morning I can hardly bend them without a lot of pain.
The possibilities are cervical spondylosis. Rheumatoid arthritis. Get a neck X-ray done and ESR and Rh. Factor tested. Hot packs and active free exercise helps .underwater movement is helpful for your fingers.