Can flying on a plane cause blood clots?

Blood clots can sometimes form in your legs during air travel because you are immobile for long periods of time, often sitting in cramped spaces with little leg room. The clinical term for this type of blood clot is deep vein thrombosis (DVT). The longer the flight, the more at risk you are for developing a clot.



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Even if you travel a long distance, the risk of developing a blood clot is generally very small. Your level of risk depends on the duration of travel as well as whether you have any other risks for blood clots.

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DVT or PE may manifest during or shortly after the flight, but often not for several weeks. Prevention includes choosing aisle seating, maintaining hydration, walking frequently, wearing loose clothing, exercising the lower extremities, using a foot rest, and avoiding alcohol and sleeping pills.

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Prevent Blood Clots During Travel
  1. Stand up or walk occasionally. ...
  2. Exercise your calf muscles and stretch your legs while you're sitting. ...
  3. Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots.


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Just as water doesn't flow easily through a kinked-up garden hose, blood can't flow as well through a vein that has a kink. On top of that, changes in air pressure inside the airplane cabin cut down the amount of oxygen you breathe in. Low oxygen in your blood can also make blood clots more likely to form.

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Compression socks may help. Whether you find yourself on a flight or a long car ride to visit family, compression garments for the legs can help prevent swelling, potential blood clots, and the general discomfort that comes from extended travel.

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The following are the most common symptoms of DVT that occur in the affected part of the body (usually the leg or arm): Swelling of your leg or arm. Pain or tenderness that you can't explain. Skin that is warm to the touch.

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Research has shown that wearing compression socks during long-haul flights can significantly reduce the risk of developing blood clots and alleviate symptoms of leg fatigue and discomfort.

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Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots. Taking aspirin to prevent blood clots when traveling is not recommended.

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Aspirin? Taking 75mg (a quarter of a normal 300mg tablet) some hours before your flight may reduce your chances of a DVT slightly (but remember that Aspirin can sometimes cause indigestion in people with a tendency to it, if in doubt ask your GP);

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The 16 Best and Worst Foods to Eat Before Flying
  • High Salt Snacks. Chips and other salty snacks are generally packed for long trips. ...
  • Fried Foods. Fried foods are also high fat foods, which tend to take longer to digest compared to others. ...
  • Beans. ...
  • Spicy Foods. ...
  • Garlic. ...
  • Cruciferous Veggies. ...
  • Coffee. ...
  • Carbonated Drinks.


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Talk to your doctor about wearing compression stockings or taking medicine before departure if you have additional risk factors for blood clots. Taking aspirin to prevent blood clots when traveling is not recommended. If you take aspirin for other reasons, check with your doctor.

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