27-year-old man three days without gas, defecation, consider may be caused by constipation, intestinal obstruction and other causes, according to the cause of treatment, such as lactulose, probiotics and other drugs orally or gastrointestinal decompression treatment, serious cases need surgery. 1. Constipation: Because of the young age of the patient, the possibility of constipation is relatively large, resulting in slow gastrointestinal peristalsis, defecation difficulties, it is recommended to consume coarse fiber foods, such as corn, cereals, etc., supplemented by a moderate amount of exercise, such as the above methods do not get better, give lactulose, probiotics, etc., oral, to increase intestinal peristalsis, to improve the intestinal flora, and to promote the defecation of the bowel. 2. Intestinal obstruction: any cause of intestinal contents through the obstacles collectively referred to as intestinal obstruction, mainly manifested in the stopping of defecation and other symptoms, the patient needs to consult the doctor in a timely manner, the abdominal standing plain film and other related examinations, such as the diagnosis of this disease, the need for gastrointestinal decompression under the direction of the doctor, Keselu enema and other treatments, the serious need for surgical treatment. It is recommended that the patient go to a higher level hospital for consultation, actively find out the cause of the disease, and give relevant symptomatic treatment. Medications should be used in accordance with medical advice.