Travel thrombosis: what is it, how can you prevent it, and what can you do about it?

What is travel thrombosis?

• Travel thrombosis is the formation of a blood clot in the leg as a result of prolonged sitting.
• Sitting still slows blood circulation in your legs, and blood clots can form. These clots are particularly dangerous if they break loose, as they can then cause a pulmonary embolism.
• Travel thrombosis can be recognized by swollen, painful (lower) legs and sometimes a red/purple discoloration of the skin.
• Travel thrombosis is also known as 'Economy Class Syndrome' or traveler's thrombosis.

When should you be aware of travel thrombosis?

• Travel thrombosis is often associated with long flights, but it can also occur during long bus or car rides.
• For flights, the risk of thrombosis increases from 5,000 kilometers. When sitting still in a car or bus, you should pay extra attention to your circulation, especially on journeys longer than six hours.
• Be extra mindful of the risk of thrombosis if you're traveling with a recent (leg) injury, shortly after surgery, or wearing a cast on your arm or leg.

How common is travel thrombosis?

• Thrombosis occurs in one to two percent of long-distance travelers.
• However, the risk of a (fatal) pulmonary embolism due to the clotting is much lower.
• At-risk groups for travel thrombosis include overweight travelers, people over 40, and pregnant women.

What can you do to prevent travel thrombosis?

• Ensure sufficient exercise during long journeys. On long flights, occasionally walk down the aisle. On bus and car journeys, it's important to get out during breaks and move around.
• You can also try to change positions regularly and do stretching exercises while in your seat, especially for your thighs, calves, ankles, and feet. In addition to exercise, wearing loose-fitting clothing is recommended to promote blood circulation. It's best to remove your shoes while traveling.
• Travelers in high-risk groups are advised to wear supportive socks, also known as flight support socks. Consult a doctor to determine if this applies to you, as improper use of this type of sock can be counterproductive.
• Drinking plenty of water and avoiding alcohol also helps prevent travel thrombosis.