Hello,I am a 26 year old male, about 140 lbs and 6'2''. I have a very hard time gaining weight, and have always been underweight. I am having a recurring pain in the left side of my chest, which is making me very nervous. I first began to feel it about 4 1/2 years ago. The best way to describe it is a balloon inflating behind where I imagine my heart to be, accompanied by discomfort, and sometimes sharp pain. I have seen many doctors about this issue, and have been through multiple EKG's, all indicating my heart is just fine. I don't doubt that, but this symptom is constant, and the location is stressing me out. It seems to be occurring more frequently, sometimes 6 times a day, for many days in a row. What tests should my doctors be doing to find the cause?