If there is blood in the stool once, first of all, do not be nervous, there are many reasons. The first, it could be an anal fissure, for example, dry stool can easily damage the skin of the anal canal leading to fissures, and the surface of the stool will carry blood when wiping it, and blood in the stool is usually bright red and usually accompanied by pain. The second, if there is occasional blood in the stool, it could be bleeding hemorrhoids, especially internal hemorrhoids. Hemorrhoids are varicose vein masses, which generally tend to move down the anal cushion when abdominal pressure increases or when constipation occurs, causing the hemorrhoidal veins around the anus to become tortuous and swollen, leading to bleeding. Thirdly, there may be rectal polyps or rectal adenomas, such as dry stools that tend to irritate the rectal mucosa, leading to rupture of blood vessels, which can lead to blood in the stool. Therefore, there are many causes of blood in the stool at one time, which should be combined with a medical history and a rectal examination. If necessary, anoscopy or colonoscopy can be placed to clarify the cause of the bleeding and then treat it symptomatically.