Swallowing or yawning opens the eustachian tube and allows the middle ear to get more air, equalizing the air pressure.
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Most of the time, the pressure should clear up a few hours after you're back on land, she says. If it lingers longer—into the following day, for example—you might have a buildup of fluid behind your ear that isn't ventilating properly. For that, you'll probably want to see a doctor.
Chewing gum, sucking on candy, or swallowing liquid can help to encourage the tubes in your ears to open once more. Try steam: Just like when you're congested with a cold or flu, steam can help to unblock your ears.
Spray Afrin nasal decongestant spray twice into each nostril one hour prior to flying. Begin taking a decongestant, like Sudafed, one hour before the flight. Both of these medications can be purchased over-the-counter in a drug store.