Travel more than doubles risk of blood clots: study

People who travel have nearly triple the normal risk of developing a dangerous blood clot, with a measurable increase for every two hours spent sitting in a car or wedged into an airline seat, researchers reported on Monday.

They said the risk is serious enough to merit research into better ways to keep travelers healthy, although not severe enough to justify giving airline passengers anti-clotting drugs.

Dr. Divay Chandra and colleagues at Harvard University in Boston looked specifically at venous thromboembolism -- the development of a blood clot in a vein, usually in the legs.

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