The main reason is that the prolapsed rectum and internal hemorrhoids are caused by anal fistula, which are mainly due to the fact that the prolapsed rectum and internal hemorrhoids are similar in principle. The mucus and stool in the rectum and anal canal will flow out of the body unconsciously, thus leading to long-term retention of stool at the anal opening. The fistula can cause this symptom mainly because of the complete anal fistula with internal, fistula and external mouth, because a new channel is formed outside the rectum to the anus, even if the anal opening is completely closed, feces and mucus can flow out to the outside of the anus without passing through the anal opening, and stagnate around the anus, which shows that there is always stool wiped from the anal opening.