What causes a man to drink a lot of water but urinate little?

Urine volume does not solely depend on the amount of water consumed. It is also influenced by various factors such as temperature, humidity, physical activity, and diet.

In summer or dry environments, the body loses more water through sweating and other means, so urine output may not significantly increase even with high fluid intake. Some people naturally have a slower metabolism and their bodies absorb and utilize water more efficiently, resulting in relatively less urine production.

If this condition persists and is accompanied by other symptoms such as edema, high blood pressure, or back pain, it is advisable to seek medical evaluation promptly.