When you have diabetes, the amount of insulin secreted by the pancreas is relatively insufficient, or the cells are insensitive to insulin, so that the role of insulin cannot be fully utilized, and the process of converting glucose in the blood into energy in the cells requires the participation of insulin. In this case, the brain sends signals of hunger, causing the symptom of “overeating”. As the glucose in the blood increases, it passes through the kidneys and leaks into the urine, where it appears in the urine test as urine sugar, which is also responsible for weight loss. In addition, the increase in urine sugar causes the patient to produce large amounts of urine, resulting in “polyuria,” and the excessive urine excretion makes the person thirsty and therefore “polyhydramnios. At the same time, other cells in the body also try to ask the body to break down fat and muscle protein for energy; the liver also converts muscle protein into glucose, making weight loss and “thinning” symptoms. Many patients mistakenly believe that as long as they do not drink water, the symptoms of polyuria will be reduced, but this is actually a misconception. This is a misconception because polyuria is caused by high blood sugar, not the result of drinking more water, but on the contrary, drinking too little water is not good for diabetes. For the treatment of thirst, the first thing to do is to solve the problem of high blood sugar, and only after the blood sugar drops, the symptoms of thirst can be fundamentally improved. Is drinking and urinating too much necessarily diabetes? Drinking a lot of water and urinating a lot is not necessarily diabetes. There are many reasons for thirst, excessive drinking and urination, and it is important to distinguish them from diabetes. For example, when sweating a lot in summer, it can lead to increased thirst and drinking due to increased water loss, but not much urination; in winter, less sweating makes water discharge from urine and more urination, but no thirst and polyuria; elderly people have reduced kidney concentration function, which can lead to increased nocturnal urination, all of which are physiological phenomena. Some mental factors caused by the dysfunction of the nerves regulating thirst, can drink a lot of water, and the amount of urine is also more, but the blood sugar is normal and the urine sugar is negative, called mental polyhydramnios. In contrast, patients with neuropituitary dysfunction resulting in uremia also have symptoms of irritable thirst, polyhydramnios and polyuria. In addition, chronic kidney disease often has increased urine output as well. Therefore, symptoms of thirst, excessive drinking and polyuria alone are not necessarily diabetes mellitus, while some diabetic patients do not necessarily have symptoms and can only be sure that it is diabetes mellitus if the blood sugar check meets the diagnostic criteria for diabetes mellitus.