Twenty days without bowel movement in the elderly is generally abnormal, usually suggesting that there may be diseases, such as constipation, intestinal obstruction, intestinal tumors and so on. 1. Constipation: the elderly intestinal function is poor, constipation is very common in the elderly, can be manifested as many days without bowel movement, abdominal distension and other symptoms, can be applied lactulose, polyethylene glycol electrolytes to promote defecation. 2. Intestinal obstruction: foreign bodies in the intestine, parasites, occupancy, mesenteric thromboembolism, intestinal paralysis and other causes of intestinal obstruction, can appear in the intestines to stop defecation, in addition to abdominal distension, abdominal pain, nausea, vomiting symptoms, should be fasting water, gastrointestinal decompression, if necessary, surgery to relieve intestinal obstruction. 3. Intestinal tumor: elderly patients with intestinal tumor can also have many days without bowel movement, and also have symptoms such as change of bowel movement, emaciation, anemia, etc. They need to choose surgical treatment, chemotherapy and radiotherapy according to patients’ condition. Elderly people who do not have bowel movement for twenty days should go to the hospital in time and be treated under the guidance of doctors.