My son is an elite middle distance runner who is 15 years old. He has been experiencing sharp pain on the left side of chest below the nipple while doing his workouts and occasionally when relaxing. I am taking him to doctors in next few days but was wondering if this could be heart disease or the benign precordial catch syndrome. He has a lot of allergies and allergy induced asthma occasionally. Pretty good health but does get excema and itches a lot while exercising and sweating. Thanks concerned