Milk does not contain much sugar. The sugar content of milk is about 4-7%, with about 4-7 grams of sugar per 100 grams of pure milk. The sugar contained in milk is lactose. Sugar contained in milk into the gastrointestinal tract, can not be directly absorbed by the body, through the intestinal mucosa on the lactase enzyme, lactose decomposition into galactose and glucose to be absorbed by the body, utilization and metabolism. High blood sugar patients can drink milk, but not too much at once, too much milk can easily lead to stomach pain, bloating, diarrhea and other gastrointestinal symptoms. High blood sugar people or the general population drink milk improperly lead to gastrointestinal discomfort or other symptoms need to actively seek medical attention, do not self-medication, under the guidance of a physician to standardize the treatment, so as not to delay the condition.