Does flying affect your immune system?

Low humidity on airplanes
Low 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.



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There are a number of effects altitude and airplane travel have on the body, including oxygen deprivation, alteration of sleep patterns, and an increased risk of contracting contagious diseases.

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The amount of radiation is minuscule, and jet lag can usually be overcome in a few days. But for anyone flying dozens of times per year — say, at least two cross-country flights per month — these stresses start to add up, putting frequent fliers in higher risk categories for cancers and other chronic health issues.

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I recommend all my patients take immune-boosting supplements for three to five days leading up to travel and continue to do so throughout their trip, she shared. Specifically vitamin C, vitamin D, zinc, and probiotics.

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The culprit: Low cabin humidity At very low levels of humidity, the natural defense system of mucus in our noses and throats dries up and is crippled, creating a much more tolerant environment for germs to infect us.

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Air travel Airplanes can be breeding grounds for bacteria and viruses, from cramped conditions to the low humidity that characterizes the air circulating on board. Low humidity can dry out your nasal passages and irritate your throat.

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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.

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Jet lag is a temporary sleep disorder, but not temporary enough for many travelers. If you're flying from San Francisco to Rome for a 10-day trip, for example, it may take six to nine days to fully recover. That's because it can take up to a day for each time zone crossed for your body to adjust to the local time.

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Below are some tips to help prevent or manage jet lag.
  1. Adjust to a new time zone by following the local sleep and meal schedules as soon as possible.
  2. Listen to your body and rest when needed.
  3. Avoid drinking too much alcohol.
  4. Eat well-balanced meals and avoid overeating.
  5. Exercise as much as you can.


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It is recommended that if you have a cold that you do not fly; this should be enforced by airlines in the case of aircrew, and aircrew are required to self-report any symptoms of cold, flu, or similar.

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Planes also have very little humidity and the dry air can irritate the mucous membranes of the throat.

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Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.

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