Can you get sick from flying often?

While many people believe that recirculated, germy air is the main culprit of illness after a plane ride, the real reason why flying can cause us to get sick is from low humidity. When you're soaring through the sky, the high elevations cause the humidity level in the airplane cabin to decrease.



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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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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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Many journal articles and reference books related to travel medicine cite that between 22–64% of international travellers become ill during or after travel; however, this information is minimal, outdated and limited by poor generalizability.

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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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Common travel-related illnesses include:
  • Diarrheal disease. Most travel-related diarrheal diseases are acquired by consuming contaminated water and food.
  • Hepatitis A. ...
  • Malaria. ...
  • Dengue fever. ...
  • Parasitic infections. ...
  • Tuberculosis. ...
  • Typhoid fever. ...
  • Yellow fever.


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High altitude is generally considered to be 2,400 metres (8000 feet) and above. Aircraft cabins are kept at a pressure approximately equivalent to between 1,800 to 2,400 metres; developing symptoms due to high altitude (altitude sickness) is not usual during flights for most people.

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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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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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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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Air pressure in the cabin is lower than at sea level. As cabin pressure falls while flying, gas starts to expand. As a result, you may feel pressure in your stomach or digestive system. Gas and bloating are common.

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While many love the experience of travelling by flight, it can be a nightmare for others who often complain of experiencing jet lag, nausea, memory loss, or brain fog post their journey. Some studies show that even relatively mild levels of hypoxia (deficiency in oxygen) can alter our ability to think clearly.

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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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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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Your chances of being involved in a fatal plane crash are incredibly small – around 1 in 11 million, according to Harvard researchers. While your odds of being in a plane accident are about 1 in 1.2 million, survivability rates are about 95.7% – so the odds are with you no matter how you look at it.

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What are returning travelers' most common complaints? “Diarrhea, fever and rash are the most commonly reported symptoms among post-vacation travelers,” Dr. Oza says. “But anecdotally, I see more respiratory infections in this group, possibly linked to the coronavirus pandemic.”

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According to the World Health Organization and the CDC, the following are some of the most common health problems associated with travel to developing countries: Traveler's diarrhea (by far the most common risk since it affects up to 80% of international travelers based on the destination) Enterotoxic E. coli diarrhea.

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In terms of the common cold, it is now well-accepted that acute respiratory infections are frequently experienced after air travel. So it's no surprise when we find ourselves getting sick after flying. Studies have found a high prevalence and wide array of respiratory viruses in people who have recently traveled.

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