Bowel cancer can lead to anemia, and there are several reasons for anemia caused by bowel cancer. 1. Gastrointestinal bleeding caused by bowel cancer, thus causing blood loss anemia, which is manifested by positive OB test or large amount of bleeding, thus showing that the patient shows dizziness and weakness. 2. Laboratory examination reveals that hemoglobin is significantly reduced.2. Malabsorption of nutrients caused by intestinal cancer, such as folic acid and B12, is reduced, thus leading to malnutrition anemia.3. Anemia related to intestinal cancer can also be caused by treatment, such as radiotherapy and chemotherapy, thus intestinal cancer can cause anemia, and the causes of anemia are different, so different treatments are needed according to different causes. Therefore, intestinal cancer can cause anemia, and the causes of anemia are different, so different treatments are needed according to different causes.