十万个为什么·科学启蒙30篇（4）
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Why Coffee Makes You Feel the Urge to Urinate
为什么喝咖啡后更想上厕所
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Caffeine in coffee acts as a mild diuretic, meaning it increases urine production in the kidneys.
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It blocks adenosine receptors, which normally help retain water by reducing blood flow to the kidneys.
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With less adenosine signaling, the kidneys filter more fluid and produce more urine faster.
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Caffeine also stimulates the bladder muscles slightly, making you feel urgency sooner than usual.
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This effect is stronger in people who drink little coffee or are more caffeine-sensitive.
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Drinking large amounts of coffee may lead to temporary dehydration if fluid intake doesn’t compensate.
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Other caffeinated drinks like tea or soda cause similar, though usually milder, effects.
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Regular coffee drinkers often develop tolerance, so the diuretic effect becomes less noticeable over time.
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Still, caffeine isn’t as potent as prescription diuretics and rarely causes serious imbalance in healthy adults.
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Understanding this link helps people manage hydration and bathroom timing during daily routines.