A meal on the diarrhea may be the emergence of irritable bowel syndrome, may also be acute gastroenteritis, inflammatory bowel disease and other causes. 1. Irritable bowel syndrome: Irritable bowel syndrome does not belong to organic lesions, that is, the intestinal tract is in a state of irritability, after eating a large amount of food or the abdomen is cold, increased as well as abdominal pain and other symptoms. 2. Acute gastroenteritis: If the patient is infected by bacteria and other microorganisms, or if the meal has been spoiled, the intestinal tract will be congested and edematous as a result, leading to diarrhea after eating. 3. Inflammatory bowel disease: how the patient intestinal presence of inflammatory bowel disease, such as Crohn’s disease, ulcerative colitis and other conditions, intestinal ulceration, it is easy to be stimulated, the emergence of diarrhea after eating. There may also be other causes of diarrhea at the beginning of a meal, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.