Thirst, dry mouth drinking water does not quench the thirst of the following common situations: 1, environmental factors: the human body is in a high-temperature environment, a lot of sweating to stimulate the thirst center, resulting in thirst, dry mouth, serious cases will be heat stroke, dehydration; 2, diabetes: diabetes patients due to increased blood sugar, resulting in increased osmotic urination, the body loses a lot of water and thirst, in most cases the degree of thirst is proportional to the degree of increased blood sugar, about In most cases, the degree of thirst is proportional to the degree of increase in blood glucose, and about 1/3 of diabetic patients will have the typical symptoms of three more and one less, manifested as more drinking, more urination, more food and weight loss, which can be identified by measuring fasting blood glucose and blood glucose two hours after meals; 3, urolithiasis: patients with urolithiasis show obvious symptoms of dry mouth, more drinking and more urination, and the urine volume of patients is often greater than 4L per day, and in severe cases, it can reach 10L or even more, if the above symptoms appear, they should go to the hospital in time to Dry syndrome: Dry syndrome is an autoimmune disease, patients often show dry mouth and dry eyes, patients often have dry mouth or sticky mouth due to insufficient saliva, and then have difficulty in swallowing, eat dry food, such as steamed buns, and need water to swallow, and can wake up at night due to dry mouth. This condition requires a visit to the rheumatology department for a clear diagnosis.