The typical symptoms of diabetes are polyuria, polyphagia, polyphagia and significant weight loss, the so-called “three more and one less”. Many patients have been tested and confirmed to have diabetes precisely because of this phenomenon. However, when the typical “three more and one less” symptoms appear, either the blood sugar is progressing rapidly (such as type 1 diabetes) or the blood sugar has gradually increased to a significant degree. Most type 2 diabetic patients do not have typical early symptoms, or even no symptoms at all, thus delaying the diagnosis and treatment of diabetes. Therefore, blood glucose should be checked when the following symptoms also indicate possible diabetes, such as fatigue and weakness; long-standing infections or wounds; boils and carbuncles that are prone to develop and are not easily cured; initial tuberculosis after middle age that develops rapidly and is poorly treated; itchy skin, especially vulvar itching in women; abnormal skin sensations common to the extremities, such as numbness, pins-and-needles pain, and the sensation of ants crawling on the skin surface. Abnormal sweating, such as hemianopsia, sweating profusely when eating; decreased vision or foggy feeling; sexual dysfunction, etc. Sun Hui, Department of Endocrinology, Wuhan Union Medical College Hospital When diabetes symptoms appear or when we suspect that we have diabetes, what should we do? Taking blood to test blood sugar is the only way to confirm the diagnosis of diabetes. And taking finger blood glucose is mostly used for monitoring. Normal fasting blood glucose is below 6.1mmol/L, and 2 hours after meal blood glucose is below 7.8mmol/L; in case of diabetes, fasting is below 7mmol/L and/or postprandial is above 11.1mmol/L, and in between is the critical state.