Is thrombosis prevention necessary on flights?
The risk of deep vein thrombosis (DVT) is very low in healthy airline passengers. People who have a higher risk of thrombosis can wear compression stockings for prevention, though.
Deep vein thrombosis (DVT) occurs when a blood clot forms in a person’s veins. Long flights can increase the risk of thrombosis because you hardly move your legs during the journey. But most blood clots are small, go unnoticed and then dissolve on their own.
Deep vein thrombosis is generally very rare during long flights: Studies have shown that only about 2 out of 10,000 people develop thrombosis with noticeable symptoms on flights lasting longer than four hours. They found that the risk is greater on longer flights. It is still not clear whether having a seat with more legroom affects the risk of developing thrombosis.