How to drink water feel dry mouth may be dry syndrome, hyperthyroidism, diabetes, uremia and other factors. 1. Dry syndrome: an autoimmune disease that may damage the salivary glands, leading to a decrease in salivary gland secretion, saliva secretion is reduced, which can easily lead to dry mouth, and cannot be relieved after drinking water. 2. Hyperthyroidism: the level of thyroid hormone in the body can be elevated, resulting in abnormal metabolism, the symptoms of dry mouth, it will frequently drink water, but not quench the thirst, may also be accompanied by excessive sweating, excessive food, weight loss, fatigue and other symptoms. 3. Diabetes mellitus: it may be related to heredity and bad life habits, which usually leads to less viscous saliva, and accompanied by dry oral mucosa, dry mouth, frequent drinking, accompanied by polyuria, polyphagia, weight loss and other symptoms. 4. Uremia: usually lead to insufficient levels of antidiuretic hormone in the body, there will be a dry mouth and the symptoms of drinking and urinating, may also be accompanied by dry skin, dizziness, fatigue and other symptoms. How to drink water feel dry mouth, lasting a long time, may be the existence of abnormal conditions, it is recommended to consult a doctor for examination and treatment.