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

various chemicals change the pH and the consistency of the pee which aggrivates the nerves that help determine how much volume you are holding (or maybe they know something we don’t) that trigger you to pee.
Higher pH, more likely to pee, such as coffee, alcohol, tea etc.
I dunno this is all from my urologist. Im a veteran of bladder cancer

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