Because the tube that connects your ear canal to your throat (the Eustachian tube) leaves from your middle ear, [from the cavity inside your eardrum](https://assets.website-files.com/6189339541493f6713de8e4c/61edc75230646d3fabdf0749_Asset%2B2_logo.png). The eardrum membrane completely seals off the ear canal. The Eustachian tube is for equalizing the pressure in behind the eardrum with that of the outside air.
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