I'm eighteen, and in decent shape. I weigh 188 pounds, and I'm 6' tall. I like to skateboard, and I do it close to every day. That being said, When I'm skating or exercising, sometimes I get a very sharp pain on the right side of my chest, in the upper region which leads me to believe it has to do with my lungs. The sharp pain gets worse with deep breaths, and lasts for a good half hour. It's going on right now, and is not the same as Precordial Catch Syndrome as it never "pops." It's very uncomfortable, and forces me to stop whatever activity I'm doing partly because of the feeling, but mostly because I think it might do long term damage if I continue. If you have quick fixes, or know what the heck is wrong with my body, that would help a lot.