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Sense of pressure in ear

Why is there a sense of pressure change inside the ear when someone goes down a mountain?

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The pressure inside middle ear is maintained equivalent to the external ear (so to the exterior too) due to a communicating duct between middle ear and pharynx called auditory tube, or Eustachian tube. When someone goes down a mountain air pressure on the middle ear raises and it is essential to do some exercises like fake swallowing to force the opening of pharyngeal orifice of the auditory tube to equalize pressure again.

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