If you don’t have iron in your body it sound like you have iron deficient anemia. That means you can’t produce enough blood cells that enables them to carry oxygen, hemoglobin. So that’s why people with this feel tired and short of breath.
If your body doesn't have enough iron, it cannot produce enough healthy oxygen-carrying red blood cells. Iron deficiency can cause anemia, which means you have too little hemoglobin.
Galen was a renew physician during the Middle Ages and Hippocrates believe that there are four humor in the body that which brings balance for a healthy life Blood Yellow bile Black bile Phlegm