Patients presenting with abdominal pain, unformed stools, and mucus, there are three common clinical scenarios, such as a possible inflammation, and a possible lactose intolerance, or a possible food allergy. But usually the inflammation is accompanied by fever, or there is an inflammatory reaction in the laboratory, CRP is high. If it is lactose intolerance, usually it is easy to have abdominal pain and bloating after drinking milk, which is related to drinking milk and causes more obvious symptoms. There is another kind of food allergy, food allergy long-term chronic irritation of the damage caused by this symptom.