The reason is: First, the prolapse of internal hemorrhoids can cause, internal hemorrhoids are hemorrhoids that occur above the dentate line of the anal canal, mainly caused by varicose veins around the anus, especially after the formation of the hemorrhoid nucleus, which can prolapse outside the anus with feces during defecation, and can cause serious blood in the stool. Second, rectal prolapse can also lead to symptoms, rectal prolapse is mainly due to the stimulation of the rectal mucosa by bacteria or feces hyperplasia or detachment from the intestinal wall, resulting in the expansion of the rectal mucosa from the anus, and will cause redness and swelling around the anus. In addition, papilloma caused by bacterial infection can also lead to symptoms.