The stomach pain and diarrhea when you drink cold water is related to spleen and stomach deficiency cold, chronic enteritis and irritable bowel syndrome. People with spleen and stomach deficiency cold phenomenon should reduce the cold nature of food in general, otherwise it will aggravate the spleen and stomach deficiency cold symptoms, resulting in abdominal distension, diarrhea and other performance. The temperature of cold water is relatively low, and people with spleen and stomach deficiency cold after drinking cold water, the spleen and stomach function will be damaged as a result, and many people will have diarrhea after drinking. Some people will have chronic enteritis in their intestinal system, and when these people drink cold water, the cold water enters the intestines and the intestines will have a stress reaction, not only will the inflammatory phenomenon increase, but also the intestinal peristalsis will be hyperactive, so abdominal pain and diarrhea will occur. In people with irritable bowel syndrome, after drinking cold water, the intestine will have a stress reaction, and there will even be spasmodic contractions of the smooth muscles of the intestine as a result, inducing abdominal pain, and while the intestine is spasmodically contracted, it will also peristaltically move rapidly to expel food from the intestine, so diarrhea will occur.