Why does a sudden shift from warm to cold lead to a runny nose?
In: Biology
Your nose tries to add wet and warmth to the air you breath in. When a sudden change to cold happens the nose tries to go runny to stay moist and (internally) warmer.
When warm, moist air hits something cold, you get water droplets appear on the cold surface. (Think about the windows steaming up in your kitchen when you cook)
The same thing is happening inside of you. You have warm, moist air inside of you, and when your nose gets cold then water droplets are formed that makes your nose runny
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