Sitting in the anus with a sense of pressure may be caused by the following situations: 1, may be caused by rectal prolapse, rectal mucosa to part of the rectum appears to move down the situation. If the prolapse in the anus is called internal prolapse, prolapse outside the anus is called external prolapse, especially external prolapse when the human body will feel the anus appear pressure. 2, may be caused by internal hemorrhoids, when the recent diet improperly caused by internal hemorrhoidal nuclei enlarged, stools out of the anus or clamped in the anus, when the human body is in the seated position, there may also appear the anal pressure feeling of the situation. 3, may be due to the inside of rectal The feeling of pressure may be caused by more feces in the rectum. In addition there may be due to perianal abscess, uterine prolapse, rectal tumors and other conditions, between the causes are more complex, it is best to go to the hospital in time for diagnosis and active treatment.