Before the stressful event, blood glucose was normal, during the stressful event, blood glucose was significantly elevated, and after the end of the stressful event, blood glucose returned to normal suggesting that the elevated blood glucose may be stress elevated. Stress elevation of blood glucose shows that before the stress event, the body’s blood glucose is normal, fasting blood glucose is less than 6.1 mmol/L, two hours after meal blood glucose is less than 7.8 mmol/L. When experiencing the stress event, the blood glucose level increases, fasting blood glucose is often ≥ 7.0 mmol/L or even higher, and the body’s blood glucose value is back to normal after the end of the stress event. Stressful events may be endogenous or exogenous. Endogenous events are often some physical illnesses, such as myocardial infarction, surgery, and trauma. Exogenous events are often huge events such as natural or man-made disasters, or sudden huge stimuli to the psyche. If there is a delay in normalizing the blood glucose level after a stressful event, or if there are other uncomfortable symptoms, it is recommended to go to the hospital in time.