Why does flying cause blood clots?

Blood clots can form in the deep veins (veins below the surface that are not visible through the skin) of your legs during travel because you are sitting still in a confined space for long periods of time. The longer you are immobile, the greater is your risk of developing a blood clot.



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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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After the flight If you have travelled by air you should be alert for the symptoms of DVT for up to one month after flying, and should seek medical help if any symptoms such as a swollen or painful leg, especially the calf, and/or breathing difficulties occur.

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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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Summary. Pilots should be aware of the potential increased risk of DVT associated with air travel. Several easy to follow guidelines should minimize any increased risk.

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However, anyone traveling more than four hours, whether by air, car, bus, or train, can be at risk for blood clots.

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Take your medications as prescribed
“If your doctor has not recommended that you take aspirin daily, it's not suggested that you take it when you travel to prevent blood clots,” Coogan said. “On the other hand, if you do take prescribed blood thinners, you should feel safe traveling.”

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Air travel increases the risk of developing blood clots in the veins of the legs, which can then enter the bloodstream and block an artery in the lungs, a condition called pulmonary embolism. In some cases, the opening can allow the blood clot to enter the arteries of the brain, causing a stroke.

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