Is flying bad for the immune system?

Some recent studies do in fact suggest that traveling, especially flying, can have a negative effect on your immune system, thus making it easier for you to get sick.



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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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The cramped conditions and long periods of being less active on a flight can cause pain, stiffness or swelling of your legs. Being less active can lead to slow blood flow in your veins which increases your risk of developing a blood clot, known as deep vein thrombosis (DVT). DVTs most commonly form in the legs.

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The main aspect of in-flight health that most of us will encounter is tiredness and changes to circadian rhythms. Flying often involves getting up at unsociable hours, inadequate sleep and messing up the body clock — all of which leave us more susceptible to being hit nastily by any bugs that may be floating about.

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The main aspect of in-flight health that most of us will encounter is tiredness and changes to circadian rhythms. Flying often involves getting up at unsociable hours, inadequate sleep and messing up the body clock — all of which leave us more susceptible to being hit nastily by any bugs that may be floating about.

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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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How to Boost Your Immune System Before, During, and After Travel
  • Get Fully Vaccinated. ...
  • Focus on Eating Healthy, Nutrient-Dense Foods. ...
  • Promote Good Sleep Hygiene. ...
  • Don't Forget to Stay Hydrated. ...
  • Consider Adding Supplements to the Mix. ...
  • Practice Self-Care and Stress Management. ...
  • Break Out the Disinfectant. ...
  • Lay off the Booze.


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Flying produces an inconceivable amount of C02 emissions and air pollution. For those that don't know, CO2 (carbon dioxide) is one of the key greenhouse gases that contribute to global warming – flying produces a whole lot of it.

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Our immune systems are sensitive to fluctuations in hormone levels, and when things are kept in delicate balances, the emotional and physical exertions of flying can be enough to trigger immune responses you don't want.

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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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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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Feeling unwell directly after a flight is often the cause of low humidity. Planes have a different atmospheric pressure than we are used to, which can cause the nasal passages to dry, leading to symptoms resembling flu.

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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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If you don't shower and bacteria and fungi do catch a ride back to your hotel with you, Tetro says you may end up depositing germs that aren't your own into your new space—particularly your bed.

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10 Tips for Plane Travel
  1. Drink more water. Hydration will help you handle anything air travel sends your way. ...
  2. Drink less alcohol. Alcohol presents a double threat to airplane wellness. ...
  3. Pack for hydration. ...
  4. Prepare your immune system. ...
  5. Flex your calves. ...
  6. Stretch everything else. ...
  7. Sleep near the window. ...
  8. Make your own legroom.


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Low air pressure during air travel also decreases the amount of oxygen in the air. This effect is modest and generally not noticeable for healthy travelers. For patients with significant lung disease, a small decrease in available oxygen can cause significant symptoms, especially with exercise.

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