The first aspect is to consider whether the patient has irritable bowel syndrome. Irritable bowel syndrome is a psychiatric disorder caused by various external stimuli, such as eating spicy or cold food, mood swings, changes in the surrounding environment, and diarrhea accompanied by abdominal pain due to problems in neural regulation. Secondly, it is necessary to consider whether the bowel movement is increased due to occasional food stimulation, which leads to defecation. The third aspect is to consider whether the diarrhea is caused by eating bacterial food or spoiled or expired food, which stimulates the gastrointestinal tract, increases peristalsis and enhances the permeability of the intestinal mucosa, resulting in the combination of large amounts of water and feces. The fourth aspect is that the patient’s own enteritis, combined with the climate or food or environmental factors stimulate more likely to lead to diarrhea.