question: My son is 17 and has experienced chest pain ,what he calls palpitations, when he exerts himself for about a year now. He has seen a cardiologist and had a holter monitor and just had a stress test (which he was unable to reproduce his symptoms because he also has compartment syndrome of BLE and was only able to tolerate 8 min of test. Cardiologist thinks it is NOT cardiac related. A recent chest xray to r/o pneumonia was negative for any abnormalities of the chest, ribs, sternum. Could this be musculskeletal? Where else should we be looking?