Clinically, if patients monitor high blood glucose, the specific clinical symptoms need to be further determined according to the severity of elevated blood glucose and whether it is combined with complications, mainly in the following cases: 1. No obvious symptoms: Patients monitor mildly high blood glucose, often without obvious symptoms related to excessive drinking, polyuria, polyphagia, accompanied by weight loss, weakness, etc. 2. Clinical manifestations of severe hyperglycemia: Patients who monitor blood glucose The clinical manifestations of severe hyperglycemia often appear when the patient monitors blood glucose significantly high, such as fasting blood glucose greater than 11.1mmol/L, which is manifested as excessive drinking, polyuria, polyphagia, accompanied by weight loss, obvious weakness and other related clinical symptoms. 3. Diabetic ketoacidosis symptoms: If the patient monitors blood glucose significantly high, the clinical manifestations of related acute complications appear, which can be manifested as nausea, vomiting, panic, chest tightness, etc. Clinical symptoms of diabetic ketoacidosis.