Fluid or mucus sometimes accumulates in the middle ear for a few days after the flight, which may make hearing rather dull for a while. This happens if the Eustachian tube is still blocked, and is more likely if you had a cold before flying.
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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.
Generally, airplane ear does not pose problems unless there is any structural damage in the middle ear. Rare complications may include permanent hearing loss and chronic tinnitus [6],[7].