The hazards of long-term blood in the stool are as follows: 1, leading to anemia: clinically, we often see some patients, after a long period of blood in the stool, although the amount of blood in each stool is not much, but over time can lead to anemia. In the clinic, we have encountered some patients with anemia, some are moderate anemia, and some are even severe anemia, which is difficult to treat and need to correct the anemia before operating on the patient. 2. Therefore, if blood in stool occurs, firstly, clear diagnosis should be made and then treatment should be carried out.