Why do I still feel thirsty and have a dry mouth even after drinking a lot of water?

Drinking a lot of water but still feeling thirsty and dry-mouthed can be caused by multiple factors: 1. Consider whether high environmental temperature or intense physical activity is causing the body to lose water rapidly through sweat, making it difficult to replenish the body's required water levels even with substantial water intake. 2. Dietary habits are also crucial. Consuming excessive spicy or salty foods can promote water excretion from the body, intensifying the sensation of dry mouth. 3. Certain medical conditions, such as diabetes or Sjögren's syndrome, may affect the body's water regulation mechanisms, resulting in persistent dry mouth despite adequate water intake. 4. Long-term mouth breathing or nasal congestion can also lead to oral dryness. Therefore, if this symptom persists, it is recommended to adjust dietary habits, maintain an appropriate level of environmental humidity, and consult a doctor when necessary to rule out the possibility of underlying diseases.