Poor gastrointestinal slightly eat something on the fire and loose stools, may be due to eating too much spicy stimulating food, may also be due to acute gastroenteritis, ulcerative colitis and so on. 1. Physiological reasons: improper diet, eating too much spicy and stimulating, cold food may lead to intestinal dysfunction, digestive function is reduced, can be a little bit of food on fire and loose stool performance. 2. Acute gastroenteritis: the common cause is unhygienic diet leading to bacterial infection, causing inflammation of the gastrointestinal mucosa, there may be congestion and edema and other inflammatory changes, leading to fire, loose stools, but also abdominal pain, bloating and other manifestations. 3. Ulcerative colitis: belongs to the inflammatory bowel disease, is an autoimmune disease, there can be colonic mucosal congestion and edema, ulcer formation and other changes, often accompanied by loose stools, mucus pus and blood stools, abdominal pain symptoms. If you have a bad stomach a little bit of food on fire, loose stools, after excluding the physiological causes, you should go to the hospital to find out the cause, under the guidance of the doctor according to the cause of the treatment.