The common causes of constipation, rectal protrusion and rectal cancer are constipation, slow intestinal peristalsis, which leads to prolonged retention of feces in the intestine and excessive dryness of the stool due to repeated absorption of water in the intestine during transportation. During defecation, there will be difficulty in defecation due to constipation, and even fecal impaction, which requires the use of corkage to assist in defecation. Some people may have anterior rectal protrusion, which may cause difficulty in defecation because the front of the rectum is weak, and they may even need to reach into the rectum to dig out the fecal mass during defecation. During the disease, rectal cancer may affect the peristaltic function of the rectum because of the tumor in the intestinal system, which may cause fecal pressure during defecation, resulting in the situation that the feces is in the anus but cannot be defecated.