Why can air travel have a negative influence on your sinus health? On an airplane, the cabin air supply contains various contaminants that carry potential harm to the sinuses—and may play a role in introducing bacteria into the sinus cavities.
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You can fly with a sinus infection, but to avoid unnecessary pain and sinus pressure, it's best not to fly. The changes in air pressure while flying can cause your symptoms to worsen. When your sinuses are clogged, your body can't equalize the pressure difference, so you feel pain in your head.
Low humidity on airplanesLow humidity can cause the nasal passages to dry out and cause irritation in the nose and throat. On top of that, bacteria and viruses can survive longer in low-humidity environments, making it harder for your body to fight off any infections you might catch aboard a plane.
The effects of flying on the human body vary from mild skin dryness to more severe problems like deafness. Flying increases the risk of catching a cold, dehydration, aging faster, reduced alertness, increased risk of diseases like cancer, fuzzy thinking, and many others.
Air pressure is lower at higher altitudes, which means your body takes in less oxygen. Airlines “pressurize” the air in the cabin, but not to sea-level pressures, so there's still less oxygen getting to your body when you fly, which can make you feel drained or even short of breath.