12 days after the sigmoid colon release surgery, ventilation but not stool may be due to dietary reasons, intestinal function has not fully recovered, surgical complications, etc. Treatment includes dietary modifications, medication (e.g. lactulose solution, cecrops), and further examination. After sigmoid colon laxation surgery, the reason for the inability to pass gas and stool needs to be clarified, and then consider specific treatment measures. 1. Lifestyle and dietary reasons: need to adjust the lifestyle and diet, such as appropriate exercise, eating vegetables and fruits, regular defecation and so on. 2. Intestinal function has not been fully restored: laxatives or gastrointestinal tract dynamics can be assisted, common laxatives are lactulose solution, Keserol, etc., and common gastrointestinal tract dynamics are Mosapride, Itopride, etc. 3. Surgical complications: abdominal ct, enteroscopy and other examinations need to be carried out to further clarify, in order to determine the next step in the treatment measures. For the treatment of ventilation but no bowel movement 12 days after sigmoid colon release surgery, it is recommended to consult a doctor to clarify the specific cause and then give corresponding treatment.