Hello, I am a 32 year old male. 6'2", 192 lbs. I consider myself in excellent shape fitness-wise. Very active, work out 5 times a week. No known family history of heart problems. Some family members are in poor health, mostly due to irresponsibl habits - eating poorly, drinking, smoking. Mother also has ulcerative colitis. I myself eat as healthy as possible, have never smoked, and rarely drink. Allergic to penicillin (since birth). Have been told I have a light case of IBS, and have had surgery for a hernia when I was ten. Also had asthma when I was younger but it went away.

Recently I've been having chest tightness - last two weeks or so. It is not all the time, mainly in the morning and night. Strangley I feel just fine working out - everyday running a mile and a half, push-ups, crunches, playing basketball. I also feel like there's mucus deep in my windpipe (below adam's apple) but I'm not coughing and it doesn't feel like its trickling. It feels like pressure across my chest. At first it seemed like it was on my left side, but its on the right every now and then too. I haven't yet had trouble breathing, only dizzy after squating for awhile or standing up quickly, and there is no true pain to speak of.

Paranoid, I went to urgent care and had them run some tests. EKG, chest x-ray, labs (Tropinin, Myoglobin, CK-MB, TSH, CBC, Basic Metabolic - and I also had my Air Guard unit send off samples for fasting lipid panel and hepatic funtion panel). I don't know the results of the lipids and hepatic panel, but the rest came back normal (according to the PA who saw me). My BP was 110/70, temp 97.5. No pain anywhere when examined.

Over the last two years I've lost over 40 pounds, from working out incessantly and eating right. I've never had high cholesterol. I'd been taking Xenedrine and Ginko-bilobo, but stopped.

Any idea what could cause the chest tightness? Pleurisy? Lung infection? Heart-related?