Rapid gastric emptying may cause an increase in blood glucose half an hour to an hour after eating. In patients with hyperthyroidism or after gastrojejunostomy, gastric emptying may be increased, resulting in faster absorption of carbohydrates in the intestine, causing an increase in blood glucose half an hour to one hour after eating, but fasting blood glucose and blood glucose two hours after a meal are usually normal. Patients with hyperthyroidism treated with standardized medication or iodine 131 radiation therapy, and patients after gastrojejunostomy usually have their blood glucose return to normal after dietary adjustments. Patients with abnormal gastric emptying or abnormal blood glucose are recommended to go to the hospital in time, under the guidance of the doctor to determine the cause of the disease and timely treatment.