My Son Was Taking Steroids At 18 He Had A

My son was taking steroids at 18 he had a ekg not normal the doctor said his heart was thicker than normal im sure from the steroid use he is now 41 felt chest pains the doctor said its rare his heart beats from the bottom to the top he is telling me that's he is fine but his doctor has a monitor on him for 2 days to get more information that makes me worry that this is more serious than hes telling me so I would like to know what you think ?