I aggravated my rotator cuff about 1-1/2 years ago while dumbell bench pressing at moderate weight/reps. During the exercise I could feel a sensation that wasn't that painful, but didn't feel right. It turned out to be more of an aggravation over the next 3-4 months than anything else, as it was easy to work around and was just debilitating enough to be frustrating. I never went to a doctor, but talked to some trainers who thought it was a rotator cuff (or my bias made them think it).
Fast forward to last weekend, nothing exciting happened, but I felt that same kind of strange feeling that, I'm guessing is the rotator cuff. It seems like there's a latent inflammation that gets aggravated occasionally. Incidentally, the "sensation" happened on the last rep of a "5x5" db bench press. I had a little more soreness than usual but nothing major.
I don't really feel comfortable on the flat db bench press going heavy at this point. I have, cumulatively, 13 years of weightlifting experience and never had any injuries weightlifting until 1-1/2 years ago. Is this just part of my body's warranty very slowly running out? Again, none of this is really THAT big a deal, but I do miss being able to lift w/a little more reckless abandon.