Why does the heat from spicy foods go through my nose?

Your mucous membranes go into defense mode. That means they make plenty of extra mucus (snot) to flush out the capsaicin. This happens all over your body. You'll definitely notice the extra mucus in your nose when it starts to run.

Explanation:

Gustatory rhinitis affects many people after they eat hot or spicy foods. When a person eats these foods, a nerve called the trigeminal sensory nerve is stimulated, which causes the nose to run