Sounds like there is no weight (too much) problem, so we can't point to that. Still, as you report the chest pain seems to be related to exercise. My thinking is:
1) continue to pursue a diagnosis with your doctor(s)... an echocardiogarm (my guess) may be helpful if only to put the mind at rest. That test checks the "mechanical" aspects of the heart.
2) try to build up physical strength... this could be simply more walking, but something that would encourage cardiovascular physical health (good heart/lung function).
If you undertake an exercise program, you should discuss with his doctor to be sure my idea is a good one. It is generally good for all of us, whatever our age, to have regular exercise that makes the heart and lungs work. Slow at first, please.
If the nurse at school noticed an irregular heartbeat, then I would trust her report on this. An echo will check the "mechanical" aspects of the heart (valves, heart size, vessels) as Jerry mentioned. But if it's an electrical problem that's causing the heart to beat erratically then your son will need to wear a monitor for a period of time to catch the rhythm. Checking with an ECG while he feels fine won't show a thing.
I grew up with heart arrhythmias, had trouble with P.E. in school because my "chest hurt." The teacher would tell me to keep moving. It wasn't till I was much older that I found out my heart wasn't beating right all the time. Ask his doctor if your son needs to wear a Holter or event monitor for awhile so you can record what his heart is doing when he feels bad.
Thank you both for your comments. I'm going to talk to his regulaur doctor this week. My son isn't that active and he's small.. and I'm going to get more test done if the doctor thinks I should.
The nurse called me at the end of the school yr about my son complaining of chest pain! she monitored him for an hr nd constantly chked his vitals! they were fine sitting down and standing up his oxygen level wen from 100 to 80 in sec and cont to drop until he sat down! i am at he er again wth simuliar circumstances bt this time he passed out and his face was pail and hi lips turned white! he has been to a cardiologist ad tey sad he wasfine!
he is also 11 years old and weighs bout 86lbs
Looking back, chest pain in my mid teens was the first symptom that i remeber of my Wolff Parkinson White syndrome. My Dad took me to a Dr who said it was growing pains.
Throughout my adult life i had symptoms including dizziness that was also misdiagnosed.
I wasn't diagnosed with WPW until I was 50.
I was lucky to have an incident that led to a cardiologist noticinr that I had a subtle delta wave in my ECG and doing a further test that confirmed that I had WPW.
My symptoms didn't seem to manifest for 24 hour halter checks.
If your son keeps having symtoms you may need to insist on further checks.
Your son needs to be evaluated by a pediatric cardiologist. Make an appointment.
I would say check into Dysautonomia and find a doctor who specializes in it.
I have to agree with michellepetkus...
From what you've described it definitely sounds like a case of Dysautonomia - specifically check out POTS. Passing out is one of the major symptoms... If this does seem like the case, you might want to look into having a Tilt Table Test done. http://www.dinet.org/pots_an_overview.htm
I started having the same symptoms (especially chest pain) when I was 10... I didn't get diagnosed with it until I was 17.
I hope everything goes well for your son & that you get some answers soon. Let me know if you have any questions. :)