Hi. I fell on my left arm yesterday night and I felt a popping sensation. I moved my arm a bit and something popped back, but there is a lot of pain whenever I move my arm. The pain is localized to my upper arm, near the shoulder and hurts the most when I try to twist or lift my arm. I can move my arm, but there is pain. My fingers, hand, and wrist work fine and don't cause pain when I move them around. Sometimes if I move my upper body too much, there is also some pain. My arm also now cannot carry even some heavy things (like my laptop). I am wondering what kind of injury do I have and what can I do about it.