A pinched nerve in the cervical spine can be debilitating, and felt in the arm, hand, fingers. It's a special feeling. Tendinitis is somewhat different, in that the tendons are infected and take a rather long time to heal. Carpal Tunnel can be corrected by stopping the movement that is always made, the same way. Typing this for example requires certain movements, all the time, at the same time.
Arthritis, my old friend, I have osteoarthritis in the severe degenerative stages. It's a feeling that only another victim with the same affliction, can tell you. It's misery to the fullest extent. It's sleepless nights, it's floor pacing while crying, it's asking God sometimes, yes begging, to die. It can be that bad. I take no less then six different drugs for it and my life is surrounded by it. "It" lives within me, and I cry to get out.