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Anemia is caused when your blood (specifically your red blood cells) doesn't carry enough oxygen to the cells of your body. "The most common cause of anemia is not having enough iron. Your body needs iron to make hemoglobin. Hemoglobin is an iron-rich protein that gives the red color to blood. It carries oxygen from the lungs to the rest of the body." Medlineplus (http://www.nlm.nih.gov/medlineplus/anemia.html)
So, the heart has to work harder and harder to send more and more blood with oxygen everywhere in the body so the cells work like they are supposed to. As your body works harder and harder to do just ordinary things, it gets tired.
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