The prolapse of the rectum from the anus is usually called rectal prolapse, it is generally divided into two kinds, if the full rectal prolapse is called total rectal prolapse, if the mucosa is partially prolapsed from the anus is called partial rectal prolapse. It is mainly because of the following reasons: the first may be that the patient is relatively weak, ageing, malnutrition, and then the anal sphincter muscle relaxation, hypotonia, it makes the rectum around the tissue on the rectum of the fixed role gradually declined, resulting in rectal prolapse. The second reason is long-term constipation, increased abdominal pressure, prolonged squatting and sitting, and then there is a chronic cough, and sometimes prostate hypertrophy can also increase abdominal pressure, which leads to the rectum to move down and out of the anus. So there are many reasons for prolapsing from the anus out of the rectum, sometimes the symptoms of mixed hemorrhoids gradually worsen, and also rectal polyps often prolapse, also pulling the rectal mucosa downward.