Eating something cold and then having diarrhea may be caused by gastroenteritis, peptic ulcer, irritable bowel syndrome, etc. 1. gastroenteritis: gastroenteritis caused by pathogenic bacteria infection is particularly common, gastroenteritis people eat cold food will appear nausea, vomiting, diarrhea and other symptoms. It is recommended to avoid eating spicy, irritating and cold foods or overeating. 2. Peptic ulcer: mainly caused by Helicobacter pylori infection, peptic ulcer patients eat some cold will have diarrhea, and gastrointestinal motility related to avoid eating cold and spicy stimulating food. At the same time combined with Helicobacter pylori infection patients need to be sterilized treatment. In addition, patients with more frequent diarrhea should pay attention to abdominal warmth. 3. Irritable bowel syndrome: some of the irritable bowel syndrome is mainly manifested as diarrhea, gastroenteritis and certain drugs and other factors are the main factors that aggravate the symptoms. The main manifestation of the change in stool characteristics, mainly for abdominal pain and constipation, abdominal pain will be relieved after defecation. Eat some cold on the diarrhea can also be seen in other causes suggest that the patient can, if necessary, under the guidance of the doctor to identify the cause of targeted treatment.