Since I was 15 I have had an annoying problem with my left arm and I never knew what it could have been. I went to the Doctor a few times but they did not know either. On another forum I was reading a dislocated thread and posted in it about my problem and after a few posts I found out it is a Rotator Cuff injury. Aka a muscle tear. It has happened a lot of times since then, either with a slight movement of my left arm, or something like putting my arm behind my back. I was given a link to the injury and some text on what happens for it was this: That is exactly what has happened every time and it is annoying and has made me slightly scared of doing anything or moving my arm into abnormal positions which other people do on a daily basis. I will have to go to my Doctor with this information and hopefully it can get fixed. It has happened many times so hopefully it is not a unfixable tear. So happy I finally know what it could be, and that it is fixable. Anyway, has anyone else had a bad or severe injury like this or much worse?