Causes of stool bleeding once and normal again are small bleeding spots in the intestines, ruptured hemorrhoids, anal fissure and so on. 1. Small bleeding point in the intestinal tract: if the mucous membrane in the intestinal tract has a small bleeding point due to the fecal slag, the blood will be mixed in the fecal slag and discharged. Due to the small bleeding point, the mucous membrane repairs itself very quickly, so the number of stools with blood is limited. 2. Hemorrhoidal rupture: if the patient is too hard to stool, it will lead to hemorrhoidal surface rupture, if the fissure is too small, it will be healed after stool, and after that, if you don’t exert yourself to stool, you won’t have blood. 3. anal fissure: patients suffering from anal fissure, fecal slag rough and difficult to discharge when friction damage aggravated anal fissure, resulting in blood seepage, pain, anal fissure degree of mild, the body will repair itself. The next bowel movement may not seep blood. If the patient has blood in the stool once and then normal, you can perform rectal fingerprinting, abdominal ultrasound, fecal occult blood test and other tests to clarify the cause of the disease.