Fresh blood in the stool is related to rectal polyps, anal fissures, hemorrhoids and other factors. The appearance of bleeding stool is mainly considered to be caused by bleeding in the gastrointestinal tract, such as patients with low intestinal bleeding, as well as bleeding in large amounts and more, which can lead to bright red color of stool: 1, rectal polyps, the patient will cause friction between feces and polyps during defecation, which can easily lead to surface breakage of polyps, thus causing local bleeding. Although patients do not feel pain, but the blood and stool do not mix, will appear the performance of blood in the stool. 2, constipated patients long-term dry stool, stool is too coarse, force during defecation, resulting in perianal skin cracking, thus causing blood in the stool performance, most patients will appear severe pain in the anal area. 3, constipation, dry stool is more harmful to the body, in the stool through the anal area, resulting in the local veins The plexus bleeds, so it can cause the recurrence of hemorrhoids and also blood in the stool, which can also lead to anemia in serious cases.