The more you drink, the drier your mouth may be related to diabetes, uremia, dry syndrome and so on. 1. diabetes mellitus: elevated blood sugar, glomerular filtration of glucose ability to increase, resulting in a large amount of glucose in the urine, osmotic diuresis, resulting in excessive loss of water in the body, excessive drinking and urination, thirst and other manifestations, resulting in the more you drink, the drier your mouth. 2. Uremia: the lack of antidiuretic hormone, resulting in renal tubular reabsorption of water obstacles, resulting in water can not stay in the body, with a large number of urine discharge, resulting in dry mouth, the lack of water in the body, but also a lot of water, resulting in the more you drink, the drier you get. 3. Dry syndrome: Salivary gland secretion is reduced, resulting in dry mouth, tongue pain, etc., need to drink water frequently, accompanied by dry eyes, foreign body sensation, etc., appearing the more you drink water, the drier your mouth. If you have a dry mouth, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, active treatment, to avoid affecting the normal life.