Cancer anemia may be caused by megaloblastic anemia, iron deficiency anemia, chronic anemia, etc. It can be treated by blood transfusion or taking iron supplements, etc. It needs to be treated for the cause. 1. Megaloblastic anemia: If people with megaloblastic anemia are suffering from nutrient deficiencies due to underfeeding during the treatment period, they can be treated by taking vitamin B12, folic acid and other substances. 2. Iron-deficiency anemia: If people have iron deficiency anemia due to insufficient food containing iron or excessive consumption during the treatment period, they can be treated by taking iron supplements, and it is suggested that people during the treatment period should eat more spinach, pig liver and other iron-rich foods. 3. Chronic anemia: Cancer patients usually have chronic anemia, such as blood system diseases. At the same time, radiotherapy treatment can also reduce hemoglobin, white blood cells and platelets. If anemia occurs during treatment, the patient should actively treat the primary disease, and if the hemoglobin is less than 60, the patient can be treated by transfusion of red blood cells. It is recommended to confirm the diagnosis of the disease through blood tests and other tests, and then follow the doctor’s instructions to treat the cause of the disease.