The popping sensation in the ears is caused by the effect of the changes in pressure and altitude. The most important part of the ear is the eardrum, a thin membrane separating the outer ear from the middle ear. Equal air pressure is maintained on both sides of the membrane by the Eustachian tube, a tube which connects the ear and the throat. Sudden changes in the air pressure like when going up or down in an aeroplane stretches the eardrum, causing discomfort. The Eustachian tube tries to normalise the pressure by forcing more air into the ear internally through. yawning or swallowing. This adjustment creates the popping sound which indicates that the air pressure is back to normal in the ear. Ears may pop even when you travel in a high speed elevator of a tall building or go scuba diving.

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