Diabetic dry mouth in refers to the feeling of thirst even after drinking water, and this condition worsens as the condition worsens. Usually dry mouth is effectively relieved by thirst after drinking water. Dry mouth in diabetes mellitus is mainly related to the absolute or relative insufficiency of insulin secretion resulting in elevated blood or urine glucose concentration, impaired tubular concentration, or excessive anxiety. Elevated blood glucose exceeds the ability of the kidneys to reabsorb, resulting in the presence of glucose in the urine, and glucose in the urine is hypertonic, and can carry water along with the excretion of the body, and at this time, too much water is excreted, and there will be a situation in which you feel thirsty even after drinking water. Generally, dry mouth is only manifested as simple thirst, not accompanied by any organic lesions, and is not caused by disease, but can be caused by hot weather or excessive sweating, etc., after drinking water, thirst symptoms will be effectively relieved. The mechanism of these two kinds of dry mouth is not the same, and for these two kinds of dry mouth treatment program is also different, if the dry mouth can not be relieved after drinking water, it is recommended to consult a doctor for examination, to rule out whether the diabetes mellitus.