Dry mouth may be physiological reasons, may also be pathological factors, such as diabetes, hyperthyroidism, dry syndrome and other metabolic diseases, it is recommended to go to the regular hospital in a timely manner, consult with professionals to find out the causes, to avoid delays in the condition. 1. Physiological reasons: hot weather, indoor temperature is too high, not enough water, long time without drinking water and other causes of dry mouth, usually do not need special treatment, pay attention to timely supplementation of water. 2. Pathological reasons: such as diabetes, hyperthyroidism and other metabolic diseases, the body is generally sustained high metabolism, polyuria, fear of heat, and easy to dry mouth, insufficient water supplementation; dry syndrome when the salivary glands to reduce secretion, saliva to reduce the mouth, dry mouth. In daily life, you can drink more water, hydration can be appropriate to alleviate non-disease under the mouth dry; such as suspected of suffering from related diseases, it is still recommended to go to the regular hospital in a timely manner.