Question 1

Why does your nose run in cold weather if you're not sick?

Accepted Answer

A runny nose in cold weather is a normal reflex called cold-induced rhinorrhea. Temperature-sensitive nerve endings in your nasal tissue detect cold air and trigger your submucosal glands to release mucus, which protects your airways from drying out. Additionally, water vapor from your warm exhaled breath condenses when it meets cold air at your nostrils, contributing to the drip.

Question 2

What is the purpose of the nose's heat exchange system?

Accepted Answer

Your nose contains turbinates, coiled bone structures lined with blood vessels that act as a heat exchanger. They warm cold, dry air from outside to nearly body temperature and humidify it to about 90 percent saturation before it reaches your lungs, protecting delicate airway tissue from damage caused by cold, dry air.

Question 3

What happens to people who lose the ability to have a runny nose in cold?

Accepted Answer

People with nerve damage affecting the cold-induced rhinorrhea reflex experience dry nasal tissue, fissures, chronic crusting, and reduced particle filtration. Without the protective mucus film, their lungs receive dangerously cold, dry air, leading to burning sensations and increased respiratory infections.

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The Quiet Mechanics of a Cold-Weather Nose