If blood glucose is slightly elevated, patients may not necessarily show obvious symptoms; when blood glucose is significantly elevated, patients may show symptoms such as polyuria, polydipsia, polyphagia and weight loss. 1. Metabolic disorder symptom group: i.e. “three more and one less” symptoms, manifested as polyuria, polydipsia, polyphagia and weight loss. Polyuria is due to the increase of sugar in the urine, resulting in osmotic diuresis; polydipsia is the increase of glucose in the blood, and the increase of osmotic pressure in the blood stimulates the thirst center, resulting in an increase in the amount of water consumed by the patient; polyphagia is due to the fact that glucose can not be properly utilized, and the body is relatively lacking in energy, which makes the body susceptible to hunger, and polyphagia occurs. Weight loss is because glucose cannot supply energy to the body normally, and the body will break down fat and protein to supply energy, so the patient will lose weight. 2. Other symptoms: Some patients may also have symptoms such as itchy skin, dry skin, blurred vision, and abnormal sensation in the limbs. If the patient has symptoms of high blood glucose, please go to the hospital in time to get a clear diagnosis and treatment.