My son is 14. 5'11" 130lbs. A very good long distance runner and in excellent shape. Plays lacrosse. recently he has been experiencing chest tightness, sharp pain and trouble breathing. It will last a day or two, goes away then returns. He also has had stomach trouble in the last few months. Sick, gas bloated diahrea, severe pain that moves around, more central and left sided. Don't know if they are related or two problems.