Intermittent blood in stool is most likely to be bleeding caused by internal hemorrhoids, but also bleeding caused by colorectal neoplastic diseases, intestinal polypoid lesions and intestinal inflammation. 1. If the blood in the stool is dribbling during defecation or blood on the handkerchief, bright red in color, and not mixed with stool, it is most likely to be bleeding caused by internal hemorrhoids of anal diseases. 2. If the color of blood in stool is dark red or dirty blood, and mixed with stool, it may be bleeding caused by colorectal tumor. In addition to blood in stool, patients often combine with thinning and thinning of stool, increased frequency and abdominal pain, weight loss, anemia and other manifestations. 3. Benign lesions of colon and rectal polyps: polyp lesions are often symptomatic, but when the surface of the polyp is eroded, painless blood in stool or occult blood may also occur. 4. Intermittent blood in the stool if with mucus, and accompanied by abdominal pain and diarrhea, it may be due to intestinal inflammation. If you find blood in the stool, the first thing to rule out in recent days is whether to eat dragon fruit, tomatoes and other red food caused by color changes, if it is clear that the blood is really blood in the stool, it is recommended to the regular hospital anorectal department, improve the fecal routine + occult blood as well as colonoscopy for a clear examination.