Eustachian tube: The changing pressure outside causes the trapped air in the space behind your eardrum to push or pull on the eardrum membrane. Fortunately there is an opening at the back of you upper throat that allows air in and out of this space to equalize the pressure once some pressure difference builds up. Swallowing opens up the channel. Nasal congestion can block it causing pain. Decongestants may help.
Answered 10/23/2017
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