Long Travel and Blood Clots: What You Should Know

What are blood clots?

Blood clots—or deep vein thrombosis (DVT)—can develop when traveling for more than four hours on a plane, in a car or on a train when your legs are not moving for long periods. The likelihood of developing a blood clot increases the longer you sit without moving your legs.

A blood clot will often dissolve into your body without you knowing it occurred. However, a blood clot can also break off and travel to your lungs, blocking blood flow. This blockage, known as a pulmonary embolism (PE), can be fatal.

What are the symptoms of blood clots?

Not all people with DVT will experience symptoms. When symptoms occur, they may include:

• Skin feeling warm
• Unusual red skin color
• Swelling in the leg or arm
• Unexplained pain or tenderness

Symptoms of a pulmonary embolism may include:

• Anxiety
• Chest pain that worsens when you cough or take a deep breath
• Coughing up blood
• Fainting or lightheadedness
• Irregular or fast heartbeat
• Trouble breathing

Immediately seek emergency medical attention if you are showing symptoms.

What are the risk factors for blood clots?

You may be at risk for developing a blood clot depending on risk factors, including:

• Age 40 years or older
• Obesity
• Current or recent pregnancy
• Smoking

Certain health conditions can also increase your risk, including:

• A catheter in a large vein
• Blood-thinning medication
• Cancer treatment
• Hormone replacement therapy
• Limited mobility, either temporary or permanent
• Personal or family history of blood clots
• Personal or family history of a genetic clotting disorder
• Recent injury or surgery within the past 90 days
• Varicose veins 

Can I reduce my risk for blood clots while traveling?

Talk to your doctor before you travel to address any concerns.

• Know the signs and symptoms of a blood clot.
• Know your risk factors, especially if you are on certain medications such as blood thinners.
• Take breaks from sitting to improve circulation by:
  • Alternately flexing your ankles and pointing your toes
  • Massaging your legs
  • Lifting your ankles above your waist, such as by pulling your ankles to your chest
  • Walking around
• Wear compression socks or stockings to improve blood flow and reduce swelling.