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Anemia results from a low number of red blood cells. Cancer and its treatments may lower your number of red blood cells, which help carry oxygen to all parts of your body. Lack of iron, vitamin B12 and folic acid may also add to anemia. When you are anemic, you may feel tired, dizzy, or weak. You may also have headaches, palpitations (fluttering) in your chest or become short of breath more easily. Your number of red blood cells will be checked often but it is important that you report symptoms to your doctor or nurse.