World Thrombosis Day - October 13
(Last Updated On: November 9, 2022)


On October 13th, World Thrombosis Day places attention on the overlooked medical condition of thrombosis. It’s also a day for those affected by thrombosis to share their stories.

Thrombosis is a medical condition in which blood clots block the blood vessels. The two types of thrombosis include venous thrombosis and arterial thrombosis. Venous thrombosis occurs when the blood clot blocks a vein. When the blood clot blocks an artery it is called arterial thrombosis.

In the United States alone, thrombosis affects up to 900,000 people every year. Many people with venous thrombosis will suffer lifelong complications. Some of these include swelling, pain, and discoloration of the skin. Up to 100,000 people in the United States die from thrombosis each year. On a global scale, 1 in 4 people dies from conditions caused by thrombosis.

One of the most common kinds of thrombosis is called deep vein thrombosis (DVT). Some of the primary causes of DVT include:

  • Sitting for long periods of time.
  • Prolonged bed rest, such as a long hospital stay.
  • Injury to the veins.
  • Birth control pills or hormone replacement therapy.
  • Being overweight.

People over the age of 60, pregnant women, and those who smoke are also at an increased risk of developing DVT. It’s also possible to have thrombosis without any risk factors present. Symptoms of thrombosis in the affected leg include pain or swelling, discolored skin, and a feeling of warmth.

Treatment options for any kind of thrombosis usually include blood-thinning medications. Catheters can also be placed inside the blood vessels to widen them. Ways to prevent thrombosis include staying active, losing weight, quitting smoking, exercising during long trips, and managing other health conditions.

HOW TO OBSERVE #WorldThrombosisDay

Healthcare professionals and campaign partners in 110 countries host a variety of events on this day. These events include live webinars, informational seminars, special speakers, and a design contest. There are also interviews with thrombosis survivors and medical professionals. Thrombosis survivors are encouraged to submit a selfie to the World Thrombosis Day website. To participate:

  • Learn more about thrombosis and ask your doctor what the risks are for you.
  • Read about famous thrombosis survivors, such as Hilary Clinton, Serena Williams, and James Stewart.
  • If you are a thrombosis survivor, share your story with others.

Spread awareness for this day on social media with #WorldThrombosisDay.


The International Society on Thrombosis and Haemostasis (ISTH) founded World Thrombosis Day in 2014. They chose October 13th as a way to commemorate the birthday of Rudolf Virchow. Dr. Virchow was a pioneer in the pathophysiology of thrombosis. The German physician and pathologist developed the concept of thrombosis and provided an advanced understanding of this condition.


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