Recently, we have encountered more children consulting about blood in stool, all with dry stools, thick and hard stools, and heavy bleeding. Combining with the child’s symptoms, two possibilities are considered, one is anal fissure and the other is intestinal polyp, but how to make a preliminary judgment by blood in stool? Today, we will tell you the difference between the two blood in stool. 1, anal fissure anal fissure is due to thick and hard stool, in the process of defecation to break the mucous membrane at the anus, resulting in bleeding, anal fissure defecation will be accompanied by severe pain, blood from the anus dripping after the solution of the stool, or only a small amount of blood adhering to the surface of the stool, blood is generally bright red, bleeding is relatively small, a small fissure is larger or combined with hemorrhoids bleeding more. The fissure is more outside the anal longitudinal fissure can be seen. 2, intestinal polyps intestinal polyps are warty protrusions on the inner wall of the intestine, varying in size, mostly connected with the intestinal wall, can occur in various parts of the intestine, including the sigmoid colon, descending colon, transverse colon, ascending colon, etc.. In case of dry stool, the polyps may rupture and bleed when they are squeezed and rubbed by dry and hard stool in the intestine, but the pain is often not obvious. Because of the rich capillaries of intestinal polyps, the rupture and bleeding is often larger than that of simple anal fissure. In addition, because the surface of intestinal polyps can be attached with mucus or pus moss, the blood in stool can be accompanied by mucus and pus stool. The color of the bleeding varies depending on the location of the polyp, the closer the polyp is to the anus, the brighter the color is, the darker the color is, brown or black. The blood in the lower part of the polyp is mostly adhered to the surface of the stool, while the blood in the upper part of the polyp may be mixed with the stool. For example, if there is more bleeding with mucus, bright red color and adherence to the surface, and the child does not have severe pain during defecation, sigmoid polyps are more likely.