The hazards of long-term elevated blood sugar mainly include the following: 1. acute complications such as diabetic ketoacidosis and hyperosmolar coma. long-term high blood sugar can easily form acute complications such as diabetic ketoacidosis and hyperosmolar coma, which can easily endanger patients’ lives and need to be actively dealt with. 2. long-term high blood sugar can lead to atherosclerosis, coronary artery disease, angina pectoris, myocardial infarction and cerebral infarction in patients. 3. Long-term hyperglycemia can easily complicate diabetic nephropathy, leading to renal insufficiency and even uremia. 4. Long-term hyperglycemia can lead to diabetic retinopathy and cataract, which can lead to blindness in serious cases. 5. Long-term poor blood sugar control can lead to a variety of neuropathy in diabetic patients, involving the central nervous system, peripheral nervous system, cranial nerves, vegetative nerves and other nervous systems, resulting in a variety of clinical symptoms. 6. 6.Other, long-term high blood sugar is also easy to combine various infections, poor wound healing, etc.