For people with vein disease (venous insufficiency), traveling short distances isn’t usually problematic. But on a plane or car trip lasting several hours, the risk of blood clots, or deep vein thrombosis (DVT) increases. When clots break free and travel to the lungs from the legs, this is known as pulmonary embolism and it can be fatal. Flights lasting 8 to 10 hours pose the greatest risk of clotting for people traveling with vein disease. Varicose veins and risk of blood clots If you suffer from varicose veins, the chances of developing a blood clot during air travel is increased
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