Diabetes is a relatively common chronic disease today, and although it is common, it does not mean that it is less harmful. Diabetes is harmful to the body in many ways, mainly to the heart, brain, kidneys, blood vessels, nerves, skin and other organs. The first is the harm to the cardiovascular and cerebrovascular. Cardiovascular and cerebrovascular complications are fatal complications of diabetes, such as heart attack, brain infarction and coronary heart disease, all of which may be future comorbidities of diabetes. The second is the kidney. Due to the long-term state of hyperglycemia, it causes harm to the kidney blood vessels, thus causing an abnormal increase in this filtration pressure, which can lead to renal insufficiency, and renal failure is the main cause of death in diabetes. In addition to this, it can cause atherosclerosis of the peripheral blood vessels, peripheral neuropathy, as well as retinopathy of the fundus and itching of the skin.