In the early stage of diabetes, there are no obvious symptoms, or only mild peripheral weakness and dry mouth. When fasting blood sugar is greater than 10mmol / L, only after the typical symptoms of diabetes, such as thirst and drinking, more food and easy to hunger, weight loss, polyuria foamy, blurred vision, weakness, numbness of the limbs, or itchy skin, wounds are not easy to heal, or recurrent mouth ulcers, gums swollen and painful, or women’s vulvar itching, menstrual irregularities, men’s sexual dysfunction, or even impotence, premature ejaculation, and other symptoms. It is necessary to monitor fasting, postprandial blood glucose, glycated hemoglobin and other items in order to clarify the diagnosis of diabetes, timely and active treatment to prevent or delay the occurrence of diabetes complications.