Even if you travel a long distance, the risk of developing a blood clot is generally very small. Your level of risk depends on the duration of travel as well as whether you have any other risks for blood clots.
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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.
DVT or PE may manifest during or shortly after the flight, but often not for several weeks. Prevention includes choosing aisle seating, maintaining hydration, walking frequently, wearing loose clothing, exercising the lower extremities, using a foot rest, and avoiding alcohol and sleeping pills.
The following are the most common symptoms of DVT that occur in the affected part of the body (usually the leg or arm): Swelling of your leg or arm. Pain or tenderness that you can't explain. Skin that is warm to the touch.
Traveling longer than 8 hours, whether by plane, car, bus, or train, can increase risks for life-threatening blood clot. The risk of a blood clot is about 3-times higher for people traveling on long-distance flights.
There has been considerable attention focused recently on the risk of deep venous thrombosis (DVT) associated with air travel. Despite the lack of evidence among air travelers, a single dose of aspirin has been widely recommended as a means of preventing such thrombosis.
Your GP will not be able to advise on the use of anticoagulants for flying as it is a specialist issue, so allow plenty of time to get an opinion from your specialist. Note: aspirin is not used to prevent DVT.
Most information about blood clots and long-distance travel comes from information that has been gathered about air travel. However, anyone traveling more than four hours, whether by air, car, bus, or train, can be at risk for blood clots.
According to the Mayo Clinic, Compression stockings steadily squeeze your legs, helping your veins and leg muscles move blood more efficiently. They offer a safe, simple and inexpensive way to keep blood from stagnating. Even celebrities like Jessica Alba wear compression socks while traveling.
One study estimates that 1 in 4,600 travelers will have a blood clot within 4 weeks of a long flight. According to Dr. Kahn, “the actual risk of a travel-related blood clot is quite small, and the average traveler doesn't need to worry about it.
First, air pressure changes in the cabin lower the oxygenation of your blood which can trigger a coagulation cascade, the body's natural clotting response. “That's one of the things we think makes people prone to getting DVT's,” says Dr. Bajakian.