The air pressure outside of your body changes as altitude changes. This creates a difference in pressure on the two sides of the eardrum. The result is a feeling of pressure and blockage in the ears.
High altitudes and blocked ears; Flying and blocked ears; Eustachian tube dysfunction -high altitude
Yawning or swallowing usually opens the Eustachian tube, which connects the middle ear to the nose. These movements allow the pressure to...
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Source: ADAM Encyclopedia
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