The causes of diarrhea after meals need to consider physiological factors and pathological factors. Physiological factors include cold, eating stimulating food, etc. Pathological factors include irritable bowel syndrome and chronic enteritis. 1. Physiological reasons: such as cold, eating stimulating food, etc., can stimulate the gastrointestinal tract peristalsis, resulting in diarrhea symptoms after meals. 2. Pathological causes: the gastrointestinal tract of patients with irritable bowel syndrome is highly sensitive, and diarrhea symptoms can occur after eating; chronic enteritis patients can also experience diarrhea after eating, which can be combined with colonoscopy, stool routine and other tests to clarify the diagnosis. It is recommended to consult a doctor in time to determine the cause of the diarrhea with the necessary tests.