As in title.
NB- I used the search bar beforehand, and despite this having been asked a few times, albeit in quite different ways, most had been ignored/had half-hearted responses.
In: Biology
ELI5 answer: Because what makes spicy stuff smell also irritates your sinuses, so you make mucus to shield your sinuses from what bugs it.
**EDIT** More than just capsaicin irritates your sinuses. For example, if you have a lot of cumin in your food, you’ll experience the same thing for the same reason I said above.
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