Late in December 2009, I began waking up with shoulder pain during the early morning hours! My doctor had predictive powers on that one.
I began to notice it was getting harder to tie up my ponytail without a pinching pain in the front of my shoulder.
Nevertheless, I continued to use my rowing machine and lift weights. At some point in January, I had to stop doing squats and shoulder presses, since I couldn't get the bar overhead. Oddly, shoulder shrugs still felt fine.
In addition, I started getting shoulder pain when
- reaching my left hand under my right arm pit while bathing
- bending over and dangling my arms down in front of me (for example when tying shoelaces)
- reaching back to put on my seatbelt with my left hand - I switched to using my right hand
- reaching into my left back jeans pocket
Over time, I continued limiting what I'd do, since I thought resting my shoulder was the right thing for it.