| umls-concept:C0002871 | skos:definition | MSH: A reduction in the number of circulating erythrocytes or in the quantity of hemoglobin.,CSP: subnormal levels or function of erythrocytes, resulting in symptoms of tissue hypoxia.,NCI: A condition in which the number of red blood cells is below normal.,MEDLINEPLUS: <p>If you have anemia, your blood does not carry enough oxygen to the rest of your body. The most common cause of anemia is not having enough <a href='http://www.nlm.nih.gov/medlineplus/iron.html'>iron</a>. 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.</p><p>Your iron might be too low because of heavy periods, pregnancy, ulcers, colon polyps, colon cancer, inherited disorders or a diet that does not have enough iron. You can also get anemia from not getting enough <a href='http://www.nlm.nih.gov/medlineplus/folicacid.html'>folic acid</a> or vitamin B 12. Blood disorders such as <a href='http://www.nlm.nih.gov/medlineplus/s | lld:umls |
