”Diabetes is not scary, what is scary is the complications of diabetes”, many people with diabetes have heard this saying. And what are the dangers of diabetes complications? The high rate of complications in diabetes leads to high rates of death and disability, which is one of the major reasons why diabetes is so scary. Studies have shown that 30% to 40% of patients develop at least one complication 10 years after the onset of diabetes. Retinopathy complicates the disease in 40 to 50 percent and 70 to 80 percent of patients after 10 and 15 years of disease. Approximately 10% of patients will develop severe visual impairment 15 years after disease onset, and 2% will become completely blind. The prevalence of neuropathy can reach 30%-40%, 60%-70% and 90% after 5, 10 and 20 years of diabetes, respectively. The risk of cardiovascular disease in diabetic patients is 2 to 4 times higher than in the general population, and the age of onset is earlier. Due to the vascular and neurological lesions in diabetic patients, it often leads to foot ulcers and then amputation. In terms of cause of death, the main causes of death in diabetic patients are various complications. Among them, ischemic heart disease is the most important cause of death in diabetic patients, accounting for 60% to 80% of deaths in diabetic patients. Cerebrovascular disease causes about 10% of deaths, and its mortality rate is twice that of non-diabetic patients. Diabetic nephropathy generally accounts for 10% to 30% of all deaths, and the younger the age of onset, the higher the percentage of deaths caused by diabetic nephropathy. For the treatment of diabetic complications, diabetic patients should pay special attention to the prevention and early detection of complications by combining with the doctor’s advice and regular review.