system
Given the following post, respond as if you're commenting on Reddit:
human
Why is only one side of my nose stuffy? And why will it randomly switch sides

Whenever I get a stuffy or runny nose it's only on one side and randomly it will switch sides and I have no idea why.
gpt
Perfectly normal, perfectly healthy :)

It's called a "nasal cycle", and your body is doing it intentionally.  It keeps one side of your nose from becoming too dry (you can think of it as the plugged side taking a quick bath), and might also prompt you to roll over in your sleep.  This happens all the time, even when you're not sick, but you just don't notice it.  You're probably only noticing it because you're a little sick and the snot is more noticeable.