Patient: Description of condition (onset, main symptoms, hospital visited, etc.): 64 years old, in good health. 1. dry tongue, unbearable thirst at night 2. patterns on tongue, hard to eat. The doctor just dispensed some anti-inflammatory medicine. Sun Weilian, Department of Stomatology, The Second Hospital of Zhejiang University School of Medicine: Hello! Dry mouth is related to local or systemic factors, hormone levels, drugs, immune function, systemic diseases, ageing, etc. It is necessary to find the possible causes and comprehensive treatment. There are many reasons for dry mouth, including: 1. Schegren’s syndrome (primary and secondary); 2. mental reasons (including depression); 3. drug side effects: antidepressants, tranquilizers, antihypertensives, antihistamines, etc.; 4. habitual mouth breathing; 5. glandular involvement after head and neck radiotherapy; 6. menopause; 7. diabetes; 8. neurological diseases, etc. It is recommended that you find a local oral mucosal doctor to help you find the possible causes and consult an internist for treatment if necessary. I wish you a speedy recovery!