In some patients, they cannot distinguish whether it is hypoglycemia or hyperglycemia, and the unauthorized adjustment of medication increases the difficulty of blood sugar control. The human body itself has a regulatory mechanism for blood sugar. Once hypoglycemia occurs, the body will automatically secrete glucose-raising hormones to ensure the body’s demand for sugar. When diabetic patients monitor their blood sugar at home and find that their blood sugar has increased, they take it for granted that they have not taken enough hypoglycemic drugs and increase the amount of hypoglycemic drugs they use, not knowing that the root cause of this situation is hypoglycemia, and that increasing the amount of hypoglycemic drugs will increase the blood sugar value. If the fasting blood sugar is high, the hospital doctor will suggest monitoring the blood sugar at 0:00 and 3:00 at night to identify whether it is the Sumujie phenomenon or the dawn phenomenon. Blindly adding medication is not only not conducive to smooth blood glucose control, but also will make the disease control worse. For older patients with long duration of diabetes and those with short life expectancy, the goal of blood glucose control should not be too strict, because on the one hand, these patients have poor islet function, brittle diabetes, high blood glucose fluctuations and high risk of hypoglycemia; on the other hand, because of the long duration of diabetes, autonomic dysfunction and reduced perception of hypoglycemic response. studies have shown that strict glycemic control in diabetic patients with long duration of disease and already combined macrovascular disease may increase the risk of cardiovascular death. It is still recommended that diabetic patients monitor their blood glucose regularly, see their physician for regular outpatient adjustments to their glucose-lowering regimen, and follow their doctor’s orders for changes in medication dosage.