Patients with early diabetes will experience pre-emptive hypoglycemia because patients with early diabetes will go through two periods, usually called the impaired fasting glucose period and the abnormal glucose tolerance period. During these two time periods the body’s insulin secretion index will show a transient compensatory increase, and a paroxysmal hypoglycemic response will occur due to a transient increase in insulin secretion timing stimulated by eating. Especially when it is obvious before meals or when there is no food between meals, the symptoms of hypoglycemia will also appear, and patients will have a series of clinical symptoms such as dizziness, headache, palpitations, sweating and hand tremors, so patients in the early stage of diabetes will have hypoglycemia. Once these symptoms occur, it is important to go to the hospital to find out if it is early diabetes.