Does flying affect blood circulation?

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.



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Sitting on a plane for many hours not only allows blood to pool, but it also puts your knees at an angle that makes the veins inside them kink up. 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.

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Tips for improving blood circulation on a plane
  1. Wear compression socks. Compression socks work wonders on the plane! ...
  2. Keep hydrated. Staying hydrated is essential for keeping your blood circulation in top shape, especially during a flight. ...
  3. Wear loose clothing. ...
  4. Choose a seat with additional legroom. ...
  5. Improve your fitness.


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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.

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Sitting down in a tight seat for 13+ hours can sometimes lead to circulation issues, including swelling in the feet. According to The Healthy, the chance of your body forming blood clots increases when blood isn't moving correctly, such as when onboard a long-haul flight.

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The effects of flying on the human body vary from mild skin dryness to more severe problems like deafness. Flying increases the risk of catching a cold, dehydration, aging faster, reduced alertness, increased risk of diseases like cancer, fuzzy thinking, and many others.

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Leg and foot swelling during air travel is common and typically harmless. The most likely culprit is inactivity during a flight. Sitting with your feet on the floor for a long period causes blood to pool in your leg veins. The position of your legs when you are seated also increases pressure in your leg veins.

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Low air pressure during air travel also decreases the amount of oxygen in the air. This effect is modest and generally not noticeable for healthy travelers. For patients with significant lung disease, a small decrease in available oxygen can cause significant symptoms, especially with exercise.

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The pain may be mistaken for a muscle cramp, but it can indicate formation of a deep vein clot resulting from sludging of blood in static leg muscles. Typically, the clot dissolves and pain subsides after air travelers reach their destination and have an opportunity to walk around.

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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.

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Compression socks prevent swelling
Being able to stand up and walk around or stretching is limited on a plane; therefore, promoting blood circulation is necessary. “Compression socks help to increase circulation, thus preventing swelling in your lower legs and feet,” he explains.

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Numbness can be the result of poor circulation. Circulation is restricted when seated so once you can move around, the numbness should subside. Swelling. Swelling can occur due to sitting for a long period of time and in itself, is not serious.

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There isn't any legally imposed limit as far as we're aware, but a high blood pressure must be controlled with medication before you travel for your safety. For example, blood pressure is considered high if over 140/90mmHg, so if your blood pressure is consistently above this value then it is important to reduce it.

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