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Red blood cells carry oxygen to the body's tissues. As the name implies, iron deficiency anemia is due to insufficient iron. Without enough iron, your body can't produce enough of a substance in red blood cells that enables them to carry oxygen (hemoglobin). As a result, iron deficiency anemia may leave you tired and short of breath. You can usually correct iron deficiency anemia with iron supplementation.
Iron deficiency anemia, or lower-than-normal iron levels, occurs when you don't get enough iron in your diet, have poor iron absorption or lose a lot of blood. Inadequate iron in your system leads to poor oxygen circulation. Your body doesn't get the oxygen it needs to function, making you feel fatigued and weak.