Hemorrhoids do cause painless and itchy symptoms in the perianal area as well as bleeding in the stool, as do other anal and intestinal diseases, including rectal polyps and colitis. First, consider hemorrhoids, hemorrhoids are perianal diseases occurring near the dentate line of the anal canal, mainly due to perianal varicose veins, especially the internal hemorrhoids occurring above the dentate line of the anal canal, which can irritate the surrounding mucosa and cause bleeding in the stool, and this bleeding is mostly post-stool bleeding, and the color of the bleeding is mostly bright red. Secondly, it is considered to be caused by rectal polyps, the rectal mucosa is repeatedly infected by bacteria, there will be inward proliferation, detachment from the intestinal wall and other phenomena, which will cause the rectal submucosal blood vessel rupture, resulting in bleeding in the stool. Finally, it is also considered to be caused by colitis, colitis symptoms are due to repeated bacterial infections in the intestinal tract, the onset of the initial period of no obvious symptoms of pain, but there will be blood in the stool, and most of them are mainly mucus stool.