Why do I catch a cold after flying?

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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When it comes to combatting airplane germs, there are some ways to reduce your chances of getting sick after flying.
  1. Board The Airplane Last. ...
  2. Keep Your Hands As Clean As Possible. ...
  3. Sanitize The Area Where You're Sitting. ...
  4. Give Your System A Boost. ...
  5. Stay As Hydrated As Possible. ...
  6. Keep Oral Hygiene In Mind.


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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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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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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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Dryness and air pressure changes can affect your ears, sinuses & taste. A 3 hour flight can shed up to 1.5 litres of water from the body. Aeroplane cabin humidity levels as low as 4% can cause the mucous membranes of your nose, mouth and throat to dry out.

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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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Airborne pathogens in the airplane can be spread through sneezing, coughing, and mere breathing, leaving you susceptible to a variety of illnesses. A face mask gives you an additional layer of defense against airborne pathogens. In addition, they prevent you from touching your nose and mouth with your hands.

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Aircraft cabin air is also very dry... This will make you dehydrated whether you feel thirsty or not.... and dehydration adds to fatigue after flights. Combine the two.... less oxygen per breath and dry air, and no wonder you feel done in at the end of a flight.

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Fevers caused by infection are especially common in people who have traveled to developing countries or parts of the world where healthcare resources and sanitation are limited. Any international traveler who develops fever in the weeks after returning home should be evaluated.

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The dry air, low pressure, and the low amount of oxygen cause the immune system to weaken and can lead to inflamed sinus cavities. This, in addition to being confined in a small area with little airflow, makes it hard to avoid getting sinusitis from another sick passenger.

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The Airport and Airplanes are Full of Germs Airplanes are just as dirty. Studies have shown bacteria and viruses living on armrests, seat belts, window shades, tray tables, toilet handles, and more for DAYS.

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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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