system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it easier to "hold" urine when you're walking around as opposed to sitting or standing still?
gpt
Urinating is both a conscious and a subconscious “action”.

When our bladder fills, it sends signals to our brain, and the brain interprets those signals into how badly we need to pee.

But, if we don’t need to go immediately, and we are preoccupied with something, then the brain will ignore those signals and the feeling goes away. If you wait longer and longer eventually it will stop ignoring the signals because you’re getting to a point where your bladder is really full and needs to be empty or it could get dangerous, which is when you get that “I really have to go right now emergency” feeling.

This is beneficial because 99% of the time waiting to go to the bathroom isn’t a dangerous decision, so the brain ignores those signals when it is preoccupied with something else, like walking or running, which to our ancestors could be foraging for food or running from danger.

The brain ignore the signals so as not to interrupt something that is possibly really important With something unimportant like going pee.

This is also why when you walk up to your front door you suddenly REALLY have to go to the bathroom, your subconscious brain noes that it’s not at a place that it can rest and be safe and stops ignoring those signals.