Chest issues?
Im a sixteen (very close to 17) year old boy who is built with a sturdy body, my bones are really wide and I have much more muscle than most sizes. Recently whenever I go running or any sort of cardio workout, my chest starts to hurt in a sort of needle pain kind of way. I'm not sure exactly where it is because it's an internal pain, but I've made sure that whenever it happens I stop running and slow to a walk to cool down then stop. I excersize close to normally, 2-4 times a week. I am a little out of shape but even when I was in the shape of my life it still kinda happened. Any ideas of what it is? (I know to go to the doctor but I'm going to other people for second opinions)