Abdominal pain with diarrhea after meals may be caused by physiological reasons such as eating cold and spicy food, which stimulate the intestinal peristalsis. It may also be caused by gastroenteritis, intestinal tumors and other pathological reasons that stimulate the intestinal tract after eating. 1. Physiological reasons: if you eat cold food such as cold skin, or hot pot and other spicy food, stimulate the gastrointestinal tract to accelerate peristalsis, gastrointestinal tract dysfunction, abdominal pain and diarrhea may occur after meals. This situation belongs to the physiological reaction caused by improper diet. 2. Pathological reasons: such as gastroenteritis, ulcerative colitis and other diseases, after eating food and digestive juices to stimulate the damaged intestinal mucosa, gastrointestinal peristalsis accelerated, smooth muscle spasms and so on, abdominal pain and diarrhea will also occur. If there are intestinal tumors, the gastrointestinal tract peristalsis speeds up after meals, and the food is not easy to digest and absorb will also appear abdominal pain and diarrhea. Abdominal pain and diarrhea after meals may also be caused by other reasons, which should be promptly identified under the guidance of the doctor and reasonable treatment. Normally, pay attention to light diet, avoid spicy and stimulating food.