I'm a beginner weightlifter and now have a chronic shoulder pain which I think is caused by jerking or other overhead shoulder exercises done in high speed (usually with a leg drive). The pain is located on top of my shoulders in a bony area (I think it's called "acromion").
Outside training, my shoulders are actually OK because the pain emerges only in certain ways. One way to reproduce it is to hold my arms straight then bring them to the back of my head. I read that sharp pain in certain ROM means injury, is that true?
I'm curious about what causing the pain is, my humerus bangs the acromion when jerking or something? Slow controlled shoulder exercises definitely don't make my shoulders hurt. Do you think slow overhead pressing would help (or perhaps makes it worse) or is it just something that my shoulders have to get used to?