I've been having these chest pains probably since August of '06. It's usually only when I'm playing basketball and running a lot, and then all of a sudden I feel this pain on my right side of my chest. It feels like it's an aching and tight feeling. Since it's on my right side I don't believe it's anything related to my heart. But, also I used to have no problem running a mile. And now it feels like I'm out of breath and can't breath after 4 or 5 minutes of constant running. It's not asthma I'm sure of that. I was considering some type of diagnosis dealing with the lungs. That's just a guess I don't know, but please help.