Diarrhea shortly after eating may be related to dietary factors, intestinal dysfunction, intestinal diseases and other reasons. 1. Dietary factors: unclean diet or eating cold food can lead to diarrhea, manifested as diarrhea shortly after eating. 2. Intestinal dysfunction: such as irritable bowel syndrome, abdominal pain can occur after eating, mostly relieved after defecation, diarrhea phenomenon, manifested as the above symptoms. 3. Intestinal diseases: such as acute enteritis, diarrhea is the main symptom, mostly appear suddenly a few hours after eating. When the above symptoms appear, it is recommended to go to the hospital in time, under the guidance of the doctor to clarify the cause and standardized treatment.