Body Q&A: Runny Nose What and Why?

Question:
  Why Do I Get A Runny Nose When It's Cold Outside?

Answer:

  Your nose performs a kind of climate control by heating and humidifying the air that you inhale so that it better matches the moist, warm conditions inside your lungs.

 Glands inside your nose produce secretions that add moisture, and blood vessels in your nose dilate to warm incoming air, acting like miniature radiators.
 When you breathe frigid air, those phenomena are amplified causing the "runniness".

  There are two reasons why:
 Cold air tends to be drier, which causes the glands in your nose to produce more secretions.
Second, when you exhale warm, moist air into the cold world, some of the moisture condenses into droplets which tend collect at the tip of your nose adding to the drip.

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