Diabetes mellitus may cause symptoms such as excessive drinking, excessive eating, excessive urination, etc., which affects the patient’s daily life; moreover, patients with prolonged poor glycemic control may also be induced to cardiovascular lesions, renal lesions and other complications. Patients diagnosed with diabetes are advised to take active treatment under the guidance of a doctor. Diabetic patients with elevated glucose levels in the blood may experience symptoms such as excessive drinking, excessive eating, excessive urination, weight loss, blurred vision, etc., which seriously affects their daily life. Moreover, long-term poor glycemic control may induce a series of chronic complications such as diabetic foot, diabetic cardiovascular disease, diabetic cerebrovascular disease, diabetic nephropathy, etc., which seriously affects the prognosis of patients. In addition, diabetes may also be complicated by diabetic ketoacidosis, hyperosmolar hyperglycemic syndrome and other conditions, which may threaten the patient’s life if not rescued in time. Patients diagnosed with diabetes should actively cooperate with their doctors and maintain a healthy lifestyle to help control blood sugar.