Hemoglobin is the oxygen-carrying protein molecule in the blood, specifically in the red blood cells. High hemoglobin count may be caused by dehydration, smoking, emphysema, tumors, or abuse of Epogen. Low levels of hemoglobin may be caused by anemia, blood loss, nutritional deficiency, bone marrow problems, chemotherapy, kidney failure, or sickle cell disease. Read more: Hemoglobin Article
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