Bowel cancer may affect the patient’s menstrual period. If the patient’s condition of bowel cancer is late or the surface of bowel cancer is broken and bleeding, the patient may have anemia manifestation. If the patient’s anemia is more serious, that is to say, the blood volume in the body is insufficient, it may affect the patient’s menstruation, for example, the patient’s menstrual flow is reduced and at the same time the menstrual cycle is prolonged, which may be once every two months, or once every three months, and so on. For most of the patients with bowel cancer, it usually will not affect their menstruation, because there are many patients who do not have obvious anemia symptoms, most of them are diagnosed with bowel cancer by increased frequency of bowel movement, thinning stools or small amount of black stools, etc., but the examination reveals that there is no obvious decrease in blood pigment, which usually will not affect the patient’s menstruation in this case.