I never recieved a conclusive diagnosis, the only thing they ruled out was a rotator cuff tear and then they just lumped me under the general category of "shoulder bursitis" when the pain never really went away.
I injured my shoulder in the last football game of the season four years ago. Was playing defensive end. The quarterback was trying scrambling and ended up trying to run outside and i ended up laying out superman style for the sack. Unfortunately my shoulder didnt fare to well on the landing.
For about 3 weeks I had zero range of motion from the swelling and the pain. After that went away ive had off and on chronic pain for 4 years and it gets worse every year.
From what I read, this is how it work (my crappy doctor didnt explain **** to me, i'm determined to be a much better doctor than the ones ive dealt with for various problems).
1) initial injury starts the downward spiral of symptoms as inflamation of the muscles/tendons/ligaments in the shoulder causes the muscles etc. to thicken.
2) the thicker muscles etc. do not fit as well in the shoulder pocket and become pinched when used causing repeat inflamation and further thickening
3) repeat number 2 until the pain becomes worse with time