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Ears pop to equalize the pressure between your middle ear and the outside environment. When you change altitude quickly, like during a flight or driving up a mountain, the pressure outside your ear changes more rapidly than inside. The Eustachian tube, which connects your middle ear to your throat, helps balance this pressure. When you yawn, swallow, or chew, it opens slightly, letting air flow in or out and equalizing the pressure, which causes the popping sensation.