Diabetes affects all organs of the patient’s body, and diabetic patients should not be careless if they develop diarrhea. Diarrhea is a common condition in people’s lives. Diarrhea can be caused by cold, gastroenteritis, spleen deficiency and so on. For ordinary people, diarrhea can recover on its own if it is not serious, but diabetic patients who have diarrhea must pay attention to it, as it can be life-threatening if it causes hypoglycemia. So why do diabetics have diarrhea? Diabetic diarrhea may be caused by long-term hyperglycemia leading to intestinal microangiopathy and plant neurological disorders. When diabetic patients are worried and emotional, diarrhea is likely to recur and will be aggravated by poor blood sugar control. Diarrhea can also cause hypoglycemia, which can lead to coma and shock in diabetic patients and can be life-threatening if not detected in time. If diabetic patients have diarrhea, they should not take anti-diarrhea medication on their own, but go to the hospital for examination to find out the cause and then prescribe the right medication. Because of the fragile stomach and intestines of diabetic patients, diarrhea is very easy to recur, so in daily life should pay special attention to the regulation of diet. Eat more foods rich in high-quality protein (egg whites, fish, shrimp, lean meat), high fiber and vitamins, and use or consume less vegetable protein. The amount of meals per day should be controlled at eight points full to prevent overeating from causing greater stress on the stomach and intestines. And to get into the habit of eating light food, to avoid heavy food irritation of the stomach and intestines. Diabetics with diarrhea also lose their appetite, but in order to avoid hypoglycemia, they must insist on eating, and can ensure food intake by “eating less and more”. When diarrhea occurs, diabetic patients must reduce or stop taking glucose-lowering drugs and keep measuring blood sugar. Hypoglycemia is most dangerous at night after falling asleep, so family members should regularly observe the diabetic patient at night to prevent hypoglycemic coma.