What causes dry lips and a dry tongue?

Possible causes of dry lips and a dry mouth may include the following: 1. **Environmental factors**: Excessively dry environments, such as prolonged exposure to air-conditioned rooms or arid climates, can cause rapid evaporation of moisture from the lips. 2. **Unhealthy habits**: Frequent lip-licking or breathing through the mouth can accelerate moisture loss from the lips, leading to dryness. 3. **Inadequate nutrition and hydration**: A lack of sufficient water and essential nutrients in the diet, such as B vitamins and vitamin C, can lead to chapped lips. 4. **Medical conditions**: Certain oral diseases, autoimmune disorders, diabetes, and Sjögren's syndrome can also cause symptoms of dry lips and mouth. 5. **Improper medication use**: Certain medications, such as antihypertensive drugs, may cause dry mouth and dry lips as side effects. Patients with concerns are advised to seek timely medical consultation.