High blood glucose may cause symptoms of diabetes such as excessive drinking and eating, and may also induce chronic complications such as diabetic nephropathy, cardiovascular lesions and acute complications, which may seriously jeopardize the patient’s health and even life safety. Elevated blood glucose may cause symptoms such as excessive drinking, excessive eating, excessive urination, and weight loss, which will affect the patient’s daily life; moreover, prolonged poor glycemic control may induce a series of chronic complications such as diabetic nephropathy, diabetic cardiovascular lesions, diabetic foot, diabetic neuropathy and so on, which may shorten the patient’s survival period and seriously jeopardize the patient’s physical health. In addition, if acute complications such as diabetic ketoacidosis and hyperosmolar hyperglycemia syndrome are induced, failure to rescue the patient in time may also threaten the patient’s life. Patients diagnosed with hyperglycemia should actively cooperate with doctors for treatment.