After almost a year of chronic pain and a misdiagnosis of Arthritis (can't figure that one out), I finally have a diagnosis, but I don't really understand what it is or what to do about it. Please explain IN LAYMAN'S TERMS, what Rotator Cuff Tendinopathy is and how it is treated. I felt a pull in my upper arm awhile back, as I was shrugging on a coat that was too tight. The pain was annoying, but not serious, so I ignored it. A few months later I slipped on ice, and grabbed a railing to beak my fall, with the same arm. Then the pain got serious. It hurts when my arm is bent, and I try to raise it laterally, (like a wing), or pull back (like shrugging on a shirt or a coat. Also when I try to reach back to unhook my bra or scratch my back it's incredibly painful. Once I stop that activity, the pain subsides. It's also a problem if I lay on the affected side. My arm aches and goes numb. If I lay on the other side and drape my affected arm over my body, it does the same thing. One doctor diagnosed it as Arthritis, despite the fact that the pain was obviously muscule and not joint related.