system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does only one side of my nose get stuffy when I'm sick?
gpt
during our daily lives, we always breathe more through one nostril than the other. that's due to a tissue in the nose that swells more towards either side, apparently in cycles of about 4 hours. when you're ill, the soft tissues in your nose get more swollen and clogged up with mucus. so instead of breathing more through one and less through the other, it's less through the first and none through the other.