Old dry mouth can be divided into physiological causes and pathological causes, for different reasons of dry mouth, it is recommended to exclude organic diseases and then further treatment, as follows: 1, physiological causes: generally refers to non-organic diseases such as fire, through a light diet, eat more fruits and vegetables, intake of fire herbal tea, etc., can be achieved to improve the purpose of the symptom; 2, pathological causes: generally refers to organic diseases, according to the cause of the treatment. Pathologic causes: generally refers to organic diseases, according to the cause of treatment. For patients with more serious dry mouth and tongue, it is necessary to consider the existence of dry syndrome, dry syndrome patients generally combined with dry mouth, dry eyes and other joint abnormalities, need to go to the hospital to further confirm the diagnosis, if there is indeed dry syndrome, the need for immunosuppressant or glucocorticoid treatment. If the dry mouth is caused by the body anti-urinary hormone levels caused by urinary collapse, patients with dry mouth, polyuria symptoms will be more obvious, polyuria will generally reach 4000 ml, or even more than 4000 ml, the degree of dry mouth is more obvious, the need to supplement the anti-urinary hormone i.e. mirex tablets, through the drug supplementation, the symptoms of dry mouth can be improved. In addition to improve the blood sugar test to rule out diabetes mellitus