Stomach pain and diarrhea as soon as you eat, if this happens frequently and has been going on for months, most of them are characteristic of irritable bowel syndrome, that is, gastrointestinal dysfunction due to plant nervous dysfunction. Mostly due to the following reasons: First, irregular diet. Eat fried, greasy, spicy and stimulating food or often drink alcohol, often drink strong coffee and tea, etc. Second, poor rest. Stress, emotions, tiredness and insomnia lead to dysfunction of the plant nervous system. Usually there are no special symptoms, but also need systematic treatment. First, perfect the routine stool examination, colonoscopy, if other organic diseases are ruled out, some drugs can be given for symptomatic treatment. Clinically, the commonly used ones are pivetonium bromide, bifidobacteria capsules, and Rizhong tablets.