Dexamethasone is a long-acting glucocorticosteroid, which has the effect of reducing the effect of oral hypoglycemic drugs, and symptoms of elevated blood glucose may occur after its use. The return of blood sugar to normal in a few days after dexamethasone injection is mainly related to the length of time the patient has been using it and the concentration of blood sugar itself. If the patient does not have diabetes, the use time is relatively short, in the case of normal blood sugar metabolism, about 10-15 days blood sugar can return to normal, a shorter time. If the patient originally has impaired fasting blood sugar or abnormal glucose tolerance, as well as transient hyperglycemia, after using dexamethasone, the blood sugar recovery time will be shortened, and it takes about 1 month to recover. The use of dexamethasone must be carried out in accordance with medical advice, do not increase or decrease the dosage at will, or gradually reduce the dosage. Dexamethasone is prone to other complications if it is reduced too quickly, and it is also prone to full moon face, buffalo back, centripetal obesity, and high blood pressure during the use of hormones. In addition, in daily life, patients should monitor the calorie intake daily to avoid poor blood sugar control. Patients can exercise in moderation under the guidance of professional doctors, such as common ones like walking and yoga.