eli5: Why does the serious urge to pee not correlate with the amount that comes out

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So sometimes when the urge to pee is really bad it’s bordering on painful, like after a long sleep or car drive, not that much comes out. But then other times when I’m just chilling at home and go for a pee with no urgency I pee like Seabiscuit. What gives? What causes you to need to pee so badly it hurts cuz it doesn’t seem like it’s a volume thing?

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32 Answers

Anonymous 0 Comments

No one has mentioned level of current hydration. When you are dehydrated your bladder likes or feels the need to get rid of the highly concentrated urine. When you are more hydrated the bladder doesn’t notice the urine as much because it is diluted hence not really feeling like you have to go when you have a huge bladder full of clearer liquid. My wife explains this better. Most of us are chronicly dehydrated.

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