I have numbness and pain in my right arm from high exertion activities. Any clue on what could be wrong?

When i participate in high exertion activities, i experience numbness starting in my two most medial fingers which spread up through my ulna and wrapped around the lateral part of my humerus and up through my neck. I also experience extreme pain in the back of my neck and the front of my shoulder, Does anyone have an idea of what could be wrong? Also, I am a collegiate athlete so to stop working out is not an option.