There are several reasons for dry mouth and drinking a lot of water, and then immediately urinating again: clinically more common is the patient with urolithiasis, urolithiasis is due to the lack of a hormone in the body, this hormone could have promoted the absorption of water from the renal tubules, the lack will lead to water not being able to be absorbed from the renal tubules, so a lot of urination. After the urine is excreted, the body lacks water, resulting in an increase in osmotic pressure and a feeling of thirst, so the patient has to drink a lot of water and urinate again immediately after drinking, which is a very typical manifestation of urolysis. And the amount of water drunk and the amount of urine is basically in and out of balance, and also larger, some people’s urine volume and the amount of water drunk can reach more than 10 liters, that is, there are more than 20 pounds. In addition, diabetic patients can also have dry mouth, drink a lot of water and urinate a lot, but the amount is not as big as that of diabetic patients, which is usually about 3-4 liters. Diabetic patients often have other symptoms, such as weakness, poor mental health, etc., and their blood sugar tends to be high, while patients with urolithiasis have mostly normal blood sugar. Then there is the fact that the urine routine of patients with urolithiasis is different from that of diabetic patients. The urine routine of diabetic patients will have a higher urine specific gravity, while the urine specific gravity of patients with urolithiasis will be lower.