Diabetic blood glucose levels are seasonally dependent and are generally higher in winter than in spring and fall. Cold weather in winter stimulates the secretion of catecholamines, which promotes the breakdown of glucose in the liver, thus increasing blood glucose. Diabetic patients are prone to skin injuries in winter, and bacteria invade the skin and cause ulcers, which in a state of stress will raise blood sugar. In the cold environment of winter, the human body often needs to take in more energy, activity may be reduced, if the diet is not strictly controlled, blood glucose will also be elevated. It is recommended that diabetic patients pay attention to monitoring their blood glucose in winter, and if their blood glucose fluctuates greatly, it is recommended that they seek medical attention in a timely manner.