Children with blood in the stool may be caused by anal fissure, intestinal polyps, enteritis and so on. 1. Anal fissure: there are many reasons that lead to anal fissure in children, it may be caused by constipation, or repeated diarrhea caused by anal canal damage, often accompanied by significant pain in defecation. 2. Intestinal polyps: a kind of intestinal wall superfluous organisms, mostly inflammatory polyps, often in the intestinal tract because of mechanical friction and lead to bleeding, for example, and stool friction lead to bleeding, the amount of bleeding is usually relatively small. 3. Enteritis: mainly because the intestinal tract is infected by inflammation, often congestion, or even erosion, if the intestinal wall breaks down, it is easy to cause bleeding. Children with blood in the stool, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.