Not exactly sure. For years now, I have been unable to flat bench press without pain.
For about a year now, incline, decline, and shoulder presses, (machine or dumbbell) have been painful, but I just pushed through. (Stupid, I know.)
About 4 months ago, it started to get really bad. It has the characteristics of an impingement, but also of an irritated rotator cuff. I used it very little through the shutdown, in hopes that it would heal itself, but it has not. Even going east on it now back in the gym, the pain continues, and it lingers days after using that muscle group. I’m pretty terrified of what it could be…