If you have sinus problems, you are more likely to have problems on the airplane. It's the cabin pressurization that causes the discomfort. Airplanes are pressurized so that you can get oxygen at a high altitude. Imagine a balloon that is inflated. That's exactly what the pilots do to the cabin. On descent, they begin to adjust the cabin pressure and you may feel uncomfortable, especially if you have a sinus problem or a cold. Does the above mean that Cabin decompression causes your ears to clog or Cabin pressurization causes your ears to clog?
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