I didnt have any moment of obvious injury, but all of the sudden out of nowhere I started to get a sharp almost tearing pain in the outside back of my shoulder when doing the following: if I bend my arm at a 90 degree angle with my hand pointing up(as if I was doing an external rotation) and then move my elbow towards the center line of my body. If i try to deadlift with a supinated grip on the affected arm, but a pronated grip does not cause pain. If I try to hang from a pullup bar or do a lat pulldown. If I try to do a row where my elbow is tucked in near to my body and/or my grip is supinated, but I get no pain if I use a pronated grip and flare my elbow out away from my body while rowing.
No aching or pain at rest. I know it's not my vaginitis flaring up, so any ideas what it could be?