Diabetes causes glucose metabolic syndrome due to insufficient insulin secretion or insulin resistance. The typical symptoms of diabetes are three more and one less, which are the so-called three highs and one low, i.e., thirsty and drink more, eat more easily, urinate more and lose weight. However, there are not many patients with typical symptoms in the clinic. If a patient has a single symptom, such as no significant weight loss or drinking more without quenching thirst, it is recommended to check blood sugar for early detection, diagnosis and treatment to delay or prevent the occurrence of diabetic complications. In addition to the above symptoms, symptoms such as peripheral weakness, blurred vision, itchy skin, and recurrent mouth ulcers will also occur, all of which should be taken seriously enough.