Diabetes itself is not scary; people should be more alert to the complications of diabetes, which are more difficult to treat. This category of complications includes acute complications and chronic complications. Acute complications, such as ketoacidosis and hyperosmolar coma, can be life-threatening in severe cases. Chronic complications, including macroangiopathy and microangiopathy and neuropathy, macroangiopathy can cause coronary heart disease and stroke, which can be life-threatening in severe cases. And the sequelae of stroke can cause disability, which is more difficult to cure. Microvascular lesions include glomerular and retinal lesions, such as cataracts, retinopathy, renal failure, uremia, which can cause death in serious cases.