Anemia is a condition that can make you feel very tired, short of breath, and lightheade. Other signs of anemia may include feeling dizzy or faint, headaches, a fast heartbeat, and/or pale skin.
Cancer treatments, such as chemotherapy and radiation therapy, as well as cancers that affect the bone marrow, can cause anemia. When you are anemic, your body does not have enough red blood cells. Red blood cells are the cells that that carry oxygen from the lungs throughout your body to help it work properly. You will have blood tests to check for anemia. Treatment for anemia is also based on your symptoms and on what is causing the anemia.