I'm a seventeen year old female, I've never had any past heart conditions, but for the past little bit i've been experiencing mild chest discomfort. It goes away for a few seconds after i take deep breaths. I don't have any medical conditionsa t all, not even ashtma or anything. I can't tell if this is serious or not, and I'm quite worried although I could just be over reating about a bad case of heartburn. Help me out?