Changes in pressure can temporarily block the Eustachian tube, causing your ears to ‘pop’ or to experience a sensation of fullness. To equalize the pressure, swallow frequently; chewing gum sometimes helps. Yawning is also effective. Avoid sleeping during descent; you may not swallow often enough to keep ahead of the pressure change. If yawning or swallowing doesn’t help, use the ‘valsalva maneuver’:
* Pinch your nostrils shut, then breathe in a mouthful of air.
* Using only your cheek and throat muscles, force air into the back of your nose as if you were trying to blow your thumb and finger off your nostrils.
* Be very gentle and blow in short successive attempts. When you hear or feel a pop in your ears, you have succeeded. Never force air from your lungs or abdomen (diaphragm); this can create pressures that are too intense.
Babies are especially troubled by these pressure changes during descent. Having them feed from a bottle or suck on a pacifier will often provide relief. Avoid flying if you have recently had abdominal, eye or oral surgery, including a root canal. The pressure changes that occur during climb and...