I am a massage therapist and will give you the "text book" description. "Tendinitis" results from microtearing of the tendon fascicles due to overloading, causing inflammation of the tendon.
Tendinosis describes degeneration changes with overuse. Tissue is inflammed.
Repetitive stress injury, when you keep doing the same movement and overload. This is a real watered down version of description.
Massage can help this condition greatly. Helps with decreasing edema (swelling), decreasing sympathetic nervous system firing (relaxes your body so the nerves are not firing, that fight or flight syndrome), break up any adhesions that may have formed, which could be limiting your range of motions, target the specific tendons and muscles affected. There are various stages, acute to chronic and all can be treated.Stretch shortened muscles, strengthen weak muscles. If you have more questions or would like an appointment, you can contact me, A. Johnson,LMP, Velvet Touch, ###-###-####.