Where and how does it hurt?
ive got some shoulder problems that come and go, right now my left shoulder has been in pretty decent pain for sometime now. The AC joint is tender sometimes even to the touch and I have pain in my anterior delt when doing most presses and lat pulls. Ive been told that my chest muscle on that side is extremely tight and this is causing my shoulder to be pulled forward and down creating pressure on my ac joint. I dont know how much of that is true but I always do feel better after I get a chiropractic adjustment in which the guy really stretches the shit out of my chest, lats, shoulder and traps.
If youve never tried self Myofascial release with a foam roller I would probably suggest that. You can pick up a foam roller for like 15 bucks or your gym may have one and do exercises like this.
the 2nd one where youre rolling on your lats really helped mine for a while and it still does but it only lasts for a short amount of time. If youve never done anything like this then be prepared b/c youre probably tight as shit in your lats and its going to HURT LIKE A BASTARD!!!
they also use a lacross ball which is really good at getting those really hard to hit areas that you cant with the roller.
Hope this helps