Anemia is a condition that develops when one’s blood lacks enough healthy red blood cells, which are the main transporters of oxygen to body tissues and organs. Symptoms of anemia–like fatigue–occur because organs aren’t getting enough oxygen.
Hemoglobin is the oxygen-carrying protein in red blood cells. If red blood cells are deficient in hemoglobin, the body is deficient in iron. Because iron is essential to hemoglobin carrying oxygen throughout the body, an iron deficiency results in a lack of oxygen delivered to the body’s cells.