Farting can be caused by irrational diet, intestinal flora imbalance, ulcerative colitis and other factors. 1. Irrational diet: If you often eat some gas-producing foods, such as tofu, sweet potatoes, potatoes, etc., or often talk during meals, it may lead to more gas in the intestines. With the peristaltic movement of the intestine, these gases may advance towards the anus, and the pressure of local intestinal segments may increase at the site where the gases pass through, which may lead to small stomach pain and farting. 2. Intestinal flora imbalance: the intestinal tract contains beneficial bacteria, harmful bacteria and symbiotic bacteria of three types of bacteria, if the harmful bacteria increase, not only may decompose intestinal contents to produce a large amount of gas, but also may affect the intestinal tract power. Under the combined effect of the two, there may be a small stomach pain always farting. 3. ulcerative colitis: ulcerative colitis is a chronic non-specific intestinal inflammatory disease, the colonic mucosa in the inflammation of the stimulus, there may be erosion, ulcers and other changes, with the intestinal peristalsis, there may be a small tummy ache fart. When there is a small stomach pain always farting, you should consult a doctor in time, use medication under the guidance of the doctor, and improve the routine fecal examination, fecal bacterial culture, colonoscopy and other tests, to clarify the cause of the disease, and active treatment.