Yes. Some people might not be eligible for a bone marrow transplant because they are not healthy enough to receive a transplant. The procedure is quite taxing on your body and hence general health should be maintained before attempting it. This is why doctors spend a good amount of time to ensure you are physically ready for a bone marrow transplant. A bone marrow transplant is a serious medical procedure and the doctors will only perform the procedure once they are sure that your body can handle it.