Wake up in the morning dry mouth causes may have insufficient water supplementation, open-mouth breathing leads to oral water loss, physiological or pathological causes of oral mucosal gland atrophy. 1. Such as eating too salty food, excessive sweating, vomiting and diarrhea, fever and other conditions, so that the body water loss, but not timely replenishment, get up in the morning, you will feel dry mouth abnormal. 2. Chronic rhinitis, sinusitis adenoid hypertrophy, upper respiratory tract infections, etc., will lead to breathing problems, the need to open the mouth to breathe, resulting in the loss of oral moisture, the morning after waking up, you will feel uncomfortable dry mouth. 3. The elderly oral mucosa glands function is reduced, will cause a decrease in salivary secretion, the morning will feel dry mouth. However, it should also be noted that if the recent dry mouth abnormal, accompanied by significant weight loss, need to be alert to hyperthyroidism, diabetes and other high metabolic diseases may be. There are other conditions that may cause dry mouth in the morning, if you improve lifestyle habits, the symptoms did not improve, it is recommended to go to the hospital for examination, follow the doctor’s instructions in a timely manner for targeted treatment, so as not to delay the course of the disease.