19 yo. normal ekg ecg and chest x-ray . inconsistent pain in left side of chest. could it be aortic dissection. had the tests a month in between.

Other causes: At you age, most causes of chest pain are due to musculo skeletal causes. An example would be muscular strain or a rib fracture. Sometimes the cause can not be determined. If you are having an irregular heart beat, feel faint, or are experiencing respiratory difficulty, then a follow up exercise test or holter EKG may be indicated.