TweetI've tore my rotator cuff and let me tell you, you will definately know you tore something when you do. I've also pulled various muscles...and there is an obvious difference in comfortablitity. If playing a sport you can still go on to a varying degree but if you tear something you will be out indefinately.
I suggest going to see a physiotherapist if you doctor isn't able to help diagnose your problem.
Aragorn