Diabetes, together with hypertension and hyperlipidemia, is one of the common chronic diseases in our life. The main symptoms of diabetes are three more and one less, which refer to more food, more drink, more urine and wasting. The three polydipsia, referring to polyphagia, polyphagia and polyuria. The glucose in the body is high and cannot be used normally, so the sugar in the blood will be discharged through the kidneys. The increase of urination will aggravate the symptom of dry mouth, because the appearance of abnormal dry mouth, excessive drinking and urination, the body’s sugar is not effectively used, not able to provide energy to the body, the consumption of energy stored in the body, it is easy to appear the symptoms of hunger, eating will increase, but eating increases weight will not increase, but on the contrary, the abnormal increase of blood sugar makes the excessive consumption of fat and protein in the body will also On the contrary, the abnormally high blood sugar makes the body’s excessive consumption of fat and protein, and also appears to slowly lose weight, which is the so-called one less symptoms. Therefore, the three common symptoms of diabetes are drinking more, urinating more, eating more and losing weight.