The main chronic complications of diabetes are: 1. diabetic nephropathy. It is one of the most important combined complications of diabetes, because long-term uncontrolled blood sugar leads to diabetic nephropathy, proteinuria and even serious kidney failure. 2. diabetic eye complications, such as diabetic retinopathy, diabetes-related uveitis, and diabetic cataracts. 3. diabetic foot, gradual ulceration and infection, some patients even have to undergo amputation treatment to save their lives. 4. 4. diabetic cardiovascular lesions, such as cardiomyopathy, infarction and coronary heart disease. 5. diabetic cerebrovascular lesions, such as cerebral hemorrhage, cerebral infarction and other complications. 6. diabetic neuropathy, such as peripheral neuropathy, autonomic neuropathy leading to numbness, pins and needles, electric burning, pain allergy or pain loss, insomnia, alternating constipation and diarrhea, urinary retention, etc. Clinical symptoms