1, cause cardiovascular disease When diabetes affects the heart and brain, will cause myocardial ischemia, coronary heart disease and cerebral infarction and other complications, and diabetes by the cardiovascular and cerebral vascular complications is the most important cause of death of diabetes patients.　　2, lead to lower extremity vascular lesions Diabetic patients' blood sugar, blood fat are very high, will lead to high blood viscosity, slow blood flow, so it is very easy to cause lower extremity vascular lesions, that is, the most terrible complication of diabetes - diabetic foot, if delayed treatment will also lead to amputation.　　3, cause eye lesions The most common danger of diabetic complications is that it will lead to retinopathy. At present, diabetic retinopathy has become one of the four major blinding diseases in the world. Therefore, diabetic patients should take medication to protect blood vessel health and maintain smooth blood flow, as well as early prevention of eye lesions.　　4, cause peripheral neuropathy Diabetic peripheral neuropathy is one of the main causes of diabetic patients' incapacity to work, and the incidence rate is very high. High blood sugar leads to peripheral vascular obstruction, so patients should take drugs that can unclog the blood vessels, to restore the normal supply of blood and oxygen to the nerves.