What causes chapped lips?

Chapped lips are a common condition, and the causes are as follows: 1. Environmental factors such as high temperatures, cold, or dry climates can cause rapid evaporation of moisture from the lips, leading to chapping. 2. Unhealthy lifestyle habits—such as frequently licking the lips, not using lip balm, insufficient water intake, and poor nutrition—can also worsen lip dryness. 3. Certain medical conditions, including chronic cheilitis, allergic cheilitis, Sjögren's syndrome, and diabetes, may contribute to chapped lips. Additionally, irritation from medications and cosmetics, especially products containing irritating ingredients, can also cause dryness and cracking. The causes of chapped lips involve multiple aspects, including environmental factors, lifestyle habits, underlying diseases, and irritation from drugs or cosmetics. Preventing and relieving chapped lips requires comprehensive consideration of these factors and appropriate measures accordingly.