Dry mouth may be caused by physiological reasons, but it cannot be ruled out that it is caused by pathological factors such as diabetes, dry syndrome, etc. Depending on the different reasons, the cause (medication) or the symptomatic treatment (drinking more water, using humidifiers, etc.) may be taken. 1. Physiological causes: it may be caused by drinking too little water, eating too salty food or a lot of dry food. It is recommended to drink more water and eat less high-salt food. If the environment is too dry, you can use a wet humidifier to regulate humidity, which can relieve dry mouth. 2. Diabetes: diabetic patients can lead to dehydration, prone to dry mouth and tongue, it is recommended that oral glibenclamide tablets, metformin hydrochloride tablets, glipizide tablets and other control of blood glucose, control of blood glucose after the dry mouth and tongue can be relieved. 3 dry syndrome: patients with dry syndrome can lead to dry mouth symptoms. There is no cure for the treatment of dry syndrome, mainly for alternative and symptomatic treatment, oral methotrexate tablets, azathioprine tablets, cyclosporine oral solution and other drugs and glucocorticosteroids joint application. Dry mouth can be relieved when the dry syndrome is under control. There may also be other causes of dry mouth syndrome, it is recommended to consult a doctor to clarify the cause of the disease, under the guidance of the doctor, avoid self-medication.