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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.

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