I ve had this occur several times, so it s not life threatening, but I have this pain in my chest when I inhale or exhale more than about 50% of my lung capacity. I saw a doctor about this years ago and was told it was growing pains which I have never believed. I didn t eat anything out of the ordinary and I was sitting in a church service when it started this morning and hadn t done anything strenuous. I do have spring time allergies and was outside a lot recently, but have been taking allergy medicine. It is a tight, sharp pain that goes from the inside of my third rib down on my chest the whole way through to near my spine on my back. Do you have any idea of what this could be?