Dry mouth and drinking water does not quench the thirst may be due to insufficient drinking water, may also be due to diseases, such as yin deficiency and fire (Yin essence loss in the body, the emergence of virtual fire), Yang deficiency, real fire and so on. 1. Insufficient water: the body loses too much water, there may be dry mouth, if you do not drink enough water, can not make up for the body’s lack of water, the symptoms can not be completely eliminated, so dry mouth and drink water does not quench thirst. 2. Yin deficiency: Yin deficiency in the body, the mouth and tongue lack of Yin moistening, resulting in thirst, simply drinking water can not play the effect of nourishing Yin, the need to nourish Yin and reduce fire (nourish Yin essence, reduce the fire) in order to quench the thirst, so there is a dry mouth and tongue and drink water does not quench the thirst of, for example, thirst, the use of maitake, ripened earth, and other medicines to nourish Yin and reduce the fire. 3. Yang deficiency: water enters the body downward, need Yang Qi to promote to reach the head and face, if the body Yang deficiency, water without Yang Qi to promote, can not reach the head and face parts of the mouth is still no water moistening, there may be a dry mouth and tongue drinking water does not quench the thirst, can be used under the guidance of the doctor ginseng, astragalus and other drugs to promote Yang. 4. Real fire: the body fire evil exuberant, water consumption, water after drinking water, real fire is still burning the mouth and tongue, water damage, and thus dry mouth and tongue, drinking water does not quench the thirst, the need to clear the heat and fire treatment, can be used to use Huanglian, Huangbai and other drugs to laxative fire and heat. All of the above drugs should be used under the guidance of a doctor, do not use drugs without authorization.