The eustachian tube is a small canal that connects the middle ear to the back of the nose and upper throat. Its purpose is to equalize the air pressure in the middle ear with the pressure outside it.

Eustachian tube dysfunction (ETD) occurs when the tube fails to open during swallowing or yawning. This results in a difference between the air pressure inside and outside the middle ear.

Eustachian Tube
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ETD is caused by poor function or blockage of the eustachian tube, including:

  • Inability of the tiny hairs inside the ear to remove fluid and infection
  • Poor squeezing function within the eustachian tube
  • Narrow eustachian tube—in infants
  • Adenoid tissue blocking eustachian tube—in children
  • Swollen nasal secretions that cause a blockage
  • Tumors—in adults