Dry mouth and itchy eyes may be caused by allergic reactions, dry syndrome and other diseases. 1. Allergic reaction: If the patient is exposed to allergens, the body will produce a series of allergic reactions, such as dry mouth, itchy eyes, cough and other symptoms. At this time, the first step is to quickly detach from the allergens, appropriate use of some anti-allergy drugs such as cetirizine to relieve allergic symptoms. 2. Dry syndrome: in addition to dry mouth, dry eyes, there will be caries, purpura and other symptoms. At this time, mainly through the use of glucocorticoids such as prednisone to control the condition. Due to the complexity of the causes of dry mouth and itchy eyes, it is important to consult a doctor as soon as possible to improve the relevant examinations, such as eye examinations, autoimmune antibodies and other tests, to clarify the cause of the disease. The above mentioned medications should be taken under the guidance of a professional doctor and should not be taken without authorization.