Can too much flying 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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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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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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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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Symptoms of DVT may be silent or present as a deep pain in one calf or thigh (with swelling). PE may also be silent but symptoms may include sharp chest pain, breathlessness, bloody sputum, and cardiac collapse in some cases. DVT or PE may manifest during or shortly after the flight, but often not for several weeks.

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