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Old Facts
You may have heard the old joke: if your nose is running
and your feet smell, you must be upside down! But when you were done laughing,
did you ever stop to wonder why your nose runs? Read on to find out the
whole story.
What's Running?
To really understand why your nose runs, you need to know what mucus is.
This is the gooey, sticky, slimy material that's made inside your nose
(it's also known as snot). Take a look at a coffee cup in your kitchen:
that's how much snot your nose makes every day.
Mucus does a lot of good stuff for something that's kind of gross. It
keeps germs, dirt, pollen, and bacteria from getting into your lungs by
stopping them in your nose. But sometimes mucus doesn't stay put.
Reasons for Running
There are several different reasons why your nose might run.
If you have a cold or the flu, your nose goes into mucus-making overdrive
to keep the germ invaders out of your lungs and the rest of your body,
where they might make you even sicker than you already are. Hairs in your
airways called cilia (say: sill-ee-ah) also work to get bacteria and dirt
out of your lungs and into your mucus. You know what happens then: the
mucus runs down your throat, out your nose, or into a tissue when you
blow your nose. Or it can run into your head - which is why you get that
stuffy feeling.
Kids who have allergies also get runny noses when they're around the thing
they're allergic to (like pollen or animal hair). That's because their
bodies react to these things like they're germs.
Sometimes your nose will get runny when the air in your bedroom is too
dry (this can happen when the heat's on or if you live in a dry, desert
climate). You might wake up in the morning with a runny nose because your
body's trying to make up for the fact that the air's drying out its mucus
supply.
You may also notice that your nose runs when you play outside on a cold
day. This happens because the air in your nose is a lot warmer than the
air around you. Think about when you take a shower - the bathroom gets
all steamy from the warmth. The same kind of thing happens in your nose
- water drops come together or condense, mix with your mucus, and run
out your nose.
Your nose runs when you cry because when tears come out of your tear ducts
in your eyelids, they don't just run out of your eyes. Behind your nose
and eyes is a big open space called the nasal cavity. The tears run down
the nasal cavity and out into your nose, where they mix with the mucus
there.
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