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3BHow Your Hearing Works
The Eustachian Tube
Anyone who has ever suffered a head cold knows that the ears are
connected to the nose, and this connection occurs in the middle ear
through the Eustachian tube. A small tube leads from the middle ear to
the Nasopharynx. The tube supplies the counter-pressure of air to the
eardrum, making the air pressure on both sides of the small drum equal.
It also helps to clear the middle ear of congestion and in doing so,
prevents any infection. If you have felt the sensation of popping in your
ear, it is the effect of air pressure on the Eustachian tube versus the
exterior pressure of the ear canal.
When you yawn, chew or swallow, you usually hear a small clicking
sound in the ear - this is the pressure equalizing between the Eustachian
Tube and the ear canal. If you have flown in a plane, you may have
experienced popping and clogging of your ears - maybe you chewed
gum or tried to yawn to rid yourself of this annoying sensation. You
were letting the interior pressure that is provided by the Eustachian
tube through the Nasopharynx to rise to an equal level with the exterior
pressure that was passing into the ear canal. If this cannot be achieved,
as is the case with a person who flies when he or she has a cold or sinus
congestion, it can be very painful and can even cause the eardrum to
burst.
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