Clinically, patients monitor elevated blood glucose and have different clinical symptoms as well as different hazards according to the severity of elevated blood glucose, mainly seen in the following cases: i. Blood glucose does not reach the diagnostic standard: When patients have mildly elevated blood glucose but do not reach the diagnostic standard of diabetes, they are pre-diabetic, and patients often have no obvious clinical symptoms at this time, no obvious symptoms of hyperglycemia such as excessive drinking, polyuria, polyphagia and wasting. Patients with prediabetes are at risk and have a significantly increased risk of progressing to type 2 diabetes. Patients with prediabetes need early lifestyle interventions to deal with it and regular blood glucose monitoring to prevent progression to type 2 diabetes. Second, confirmed diabetes: patients with high blood glucose monitoring and diagnosed with type 2 diabetes, if the patient’s blood glucose is significantly elevated, symptoms of metabolic disorders of hyperglycemia may appear, such as polydipsia, polyuria, polyphagia, with weight loss, accompanied by weakness. Some patients may develop clinical symptoms of chronic complications related to diabetes, such as blurred vision, numbness of the limbs, foamy urine and other related symptoms. Patients with prolonged hyperglycemia can cause the occurrence of related chronic complications, with lesions of the heart, brain, kidneys and other organs, and a significantly increased risk of diabetic foot, diabetic skin lesions and diabetic peripheral neuropathy.