There are many diseases of dry mouth and thirst, the possible diseases are as follows: 1, the most common is diabetes, this will appear dry mouth, thirst, drink a lot of water, urination significantly increased, weight loss, especially can eat also especially easy to hunger, is the old people often said three more a less symptoms. 2, there is also urolithiasis, will also show a particularly dry mouth, a lot of water, a lot of urination, especially will affect the night rest, it is difficult to It is difficult to control. But the volume of urine is relatively large, sometimes greater than six liters a day. 3, rheumatology of dry syndrome will also be manifested as dry mouth, thirst, but only dry, but after drinking water does not completely relieve the symptoms. So patients tend to drink a sip, and then drink a sip after a while, and the amount of urine will not increase significantly. 4, there are patients who have none of these, but just show dry mouth and thirst, and often the amount of urine does not increase, but the urine may be frequent. This kind of patients should look at the symptoms of neurasthenia and insomnia, if there are such symptoms, it is recommended to go to the Chinese medicine department to prescribe some Chinese medicine for chronic conditioning.