@everetra - Arm pain can be anything from tendinitis to arthritis. Only a doctor can tell you. But of all the possible conditions I think that arthritis is the worst.
After all, it can’t be reversed. With muscle nerve compression, you can do some exercises that will bring about treatment, but arthritis is a gradual deterioration. About the only thing you can do is to get pain medication, which of course doesn’t treat the underlying problem.