Stomach pain and diarrhea need to consider the following aspects: First, it may be caused by food poisoning, which may be bacterially infected food or food that has expired and deteriorated. After consumption, bacteria or toxins stimulate the mucous membrane in the intestine, and intestinal colic causes increased permeability, which causes a large amount of water to pass through the mucous membrane and combine with feces, resulting in diarrhea. The second consideration is food stimulation, such as eating too cold food leading to stress abdominal pain, the stress of the intestinal mucosa leads to increased permeability and watery stools. Third, the consideration is irritable bowel syndrome, in angry and other emotional impact, cold or spicy, stimulating food can easily lead to irritable bowel, abdominal pain, diarrhea and other symptoms. Fourth, consider the inflammation of the colon, when consuming spicy, stimulating food after the aggravation of colitis, intestinal inflammation, increased permeability appears pain, diarrhea.