Why does alcohol consumption often lead to increased urine production (diuresis) and contribute to hangover symptoms?

Alcohol binds to renal tubule proteins and mechanically blocks urine reabsorption, which is permanent unless treated with diuretics that reverse the blockage.

Alcohol directly increases aldosterone secretion leading to enhanced sodium and water retention, which paradoxically causes increased urine production through compensatory mechanisms.

Alcohol triggers a rise in blood glucose that is filtered and excreted in the urine, and it is this glycosuria rather than water loss that causes classic hangover dehydration.

Alcohol suppresses vasopressin (antidiuretic hormone), reducing water reabsorption in the kidneys which increases urine output and can lead to dehydration and electrolyte losses underlying hangover symptoms.