In daily life, many patients experience blood in the stool. In addition to hemorrhoids, lesions in the large intestine are more common; colon cancer, inflammatory bowel disease, colon polyps, and anal fissures can cause blood in the stool, and the closer the lesion is to the anus, the brighter red the color of the blood in the stool. Therefore, you cannot take for granted blood in the stool as hemorrhoids. When you find blood in the stool, you must identify the cause in time. Identifying the cause is the first step in treatment, and visiting an outpatient anorectal surgery clinic is the easiest and most correct way. There are two main examination methods: 1, rectal finger examination: rectal finger examination can examine 6 to 8 cm of intestinal segment, which can initially identify hemorrhoids and rectal cancer, if the finger examination is suspicious, further colonoscopy should be done. 2.Colonoscopy: Colonoscopy can examine the whole section of the colon and is an important means of detecting intestinal polyps and cancer. 40 years of age or older who have not had a colonoscopy, especially those with blood in the stool, must undergo a colonoscopy. What should I do to be alert for people who have had hemorrhoids in the past? Hemorrhoid bleeding is caused by congestion, edema, erosion, and rupture of the nucleus of the hemorrhoid, and is usually dripping blood after the stool, or blood on hand paper after the stool, and is usually not mixed with stool, and is mostly bright red in color, with little mucus present. Therefore, it is usually mixed with feces, and the blood is slightly darker in color and often mixed with mucus. If people who had hemorrhoids in the past, they should also do colonoscopy promptly once they have lost weight, constipation worsens or the number of bowel movements increases and the nature of blood in stool changes.