Fasting blood glucose 14mmol/L lasting for three years may induce a series of chronic complications such as diabetic retinopathy, diabetic foot, diabetic nephropathy, etc. It may also be complicated with hypertension, hyperlipidemia, gout and other chronic diseases, which seriously jeopardize the patient’s health and need to be treated as soon as possible. Fasting blood glucose 3.9～6.0mmol/L is normal, ≥7.0mmol/L with diabetic symptoms can be diagnosed as diabetes. For diabetic patients, the goal of glycemic control is generally in the fasting blood glucose 4.4mmol / L ~ 7.0mmol / L. Therefore, fasting blood glucose 14mmol / L indicates that the blood glucose has been significantly higher than the normal range. Continuing for three years indicates that blood sugar is not well controlled for a long time, which may induce chronic complications of diabetes, such as diabetic retinopathy, resulting in blurred vision, blindness, etc.; diabetic foot, foot ulcers, infections, etc.; diabetic nephropathy, symptoms such as proteinuria, edema, etc., and may even develop into chronic renal failure. As well as complications of hypertension, hyperlipidemia, gout and many other chronic diseases. It is recommended to go to the hospital when fasting blood sugar of 14mmol/L occurs, and ask the doctor to judge and deal with it according to the specific situation.