Dry mouth and dry eyes may be environmental factors, may also be diseases, such as dry syndrome, diabetes, etc.. 1. Environmental factors: the air is dry, especially in winter indoor heating, air humidity is not enough to drink not much water, the lack of water in the body leads to dry mouth and eyes. 2. Dry syndrome: the disease belongs to the systemic systemic diseases, is the body’s immune system function abnormality, tear glands, salivary glands are violated, mainly manifested as dry eyes, dry mouth, dry nose, dry skin, fatigue and other symptoms. 3. Diabetes mellitus: unsatisfactory control of blood sugar can be manifested as thirst, drinking and urinating, weight loss, dry eyes, increased appetite and other symptoms. Dry mouth, dry eyes continue to fail to improve the person, it is recommended to consult a doctor to identify the cause of the disease and follow the doctor’s instructions for treatment. Dry mouth and dry eyes may also be caused by other reasons, and should consult a doctor in time to identify the cause of the disease and follow the doctor’s instructions.