According to Chinese medicine, dry mouth and thirst are mostly caused by Yin deficiency of the liver and kidney, and the lack of fluid uptake, or caused by heat and fluid injury, which burns the fluid. Dry mouth is characterized by subjective thirst, wanting to drink water, after drinking the symptoms slightly improved, but soon thirsty as before. It is important to pay attention to stomatitis, diabetes and other causes of dry mouth performance. So, how to check for dry mouth and thirst? The following is an introduction to the thirst check items: 1, but thirst is not necessarily diabetes, perhaps the stomach fire, pay attention to heat. 2, there is a phenomenon of thirst, drinking, should be alert to the occurrence of diabetic ketosis, ketosis early symptoms often have polyuria, thirst, drinking, fatigue and so on. Urinary ketone bodies, blood glucose and blood ketone bodies should be checked in time, except for ketoacidosis. If diabetes is suspected, fasting blood glucose can be measured, or a glucose tolerance test can be done to clarify the diagnosis.