Drinking water after the mouth is still dry, may be physiological causes such as severe dehydration, may also be caused by pathological reasons, such as diabetes, uremia, etc., need to be specifically analyzed. 1. Physiological reasons: mostly for severe dehydration, when the patient dehydration symptoms are more serious, the daily amount of water to drink can not replenish the body’s loss of water, the need to continue to supplement the water to alleviate the symptoms of dry mouth. This kind of situation is common in the outdoor high-temperature environment workers and a lot of training, sweating sports people. 2. Pathological causes: such as diabetes mellitus, uremia and other patients, both due to increased urination, resulting in the loss of water in the body, the patient manifests dry mouth, the need to drink a lot of water, but the water will be discharged in the form of urine, can not be absorbed by the body, and therefore there will be persistent dry mouth. Therefore, when the symptoms of dry mouth after drinking water, we should seek medical advice as soon as possible, after a clear diagnosis and active treatment, such as diabetic patients to control blood sugar, patients with uremia can be supplemented with antidiuretic hormone, the symptoms of dry mouth will gradually be relieved.