Determining that blood is mixed with stool can be done with the naked eye or under a microscope. If the blood does not mix with the stool, there is usually blood attached to the surface of the stool. If the blood mixes with the stool, there will be a thin stool. Blood that is not mixed with stool is most often seen in diseases in the perianal area. Conditions such as anal fissures or hemorrhoids. If blood is mixed with stool, consider the presence of inflammatory bowel disease or the growth of tissue such as polyps, or tumors in the intestines. If necessary, electronic fiberoptic colonoscopy can be carried out, under direct vision to observe the mucosal tissues in the intestinal tract is not congestion, edema, erosion of the situation to observe whether there is an abnormal proliferation of tissue. Patients with blood in the stool are advised to go to the hospital and ask the doctor to make a judgment.