Immediate defecation after meals may be caused by improper diet, gastrointestinal dysfunction, intestinal diseases and other reasons. 1. Improper diet: when eating too much or taking too much cold, celery, leeks, bananas, dragon fruit and other foods, due to the increase in gastrointestinal peristalsis, there may be symptoms of defecation immediately after meals. 2. Gastrointestinal dysfunction: anxiety, lack of sleep, staying up late and other triggers may lead to gastrointestinal dysfunction and symptoms of defecation immediately after meals. 3. Intestinal diseases: such as chronic colitis and other diseases, may lead to intestinal mucosal congestion, edema and erosion, poor intestinal absorption function and peristalsis, and the symptoms of defecation immediately after meals. Immediately after meals may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.