World Thrombosis Day

1 in 4 Deaths Worldwide is Related to Thrombosis

Thrombosis is a leading cause of death throughout the world. Learn the symptoms, know the facts, and help educate others about this growing health problem.

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Know Thrombosis

When traffic backs up, it's frustrating. But when a blood clot jams a vein or artery, it can be deadly. So, learn the risk factors. Know the signs and symptoms of thrombosis. Keep Life Flowing.

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WTD 2015 Impact Report

The WTD message of venous thromboembolism (VTE) awareness and prevention reached more than 440 million people around the world, a 170% growth from 2014, with the support of 320 partners from 70 countries around the world.

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What happens on 13 October?

World Thrombosis Day Steering Committee members explain the goal of our growing and global movement.

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  • Learn

    Know Thrombosis. Know the risk factors.
    Know the signs and symptoms.

  • Join

    Join the global movement to stop deadly clots and keep life flowing.

  • Take Action

    Download resources, hold events and
    share life-saving information.


know Thrombosis

Thrombosis refers to abnormal, life-threatening blood clots that form in the artery or vein. A clot in the vein (usually in the leg or pelvis) is known as a deep vein thrombosis (DVT) and a clot that breaks off and travels to the lungs is known as a pulmonary embolism (PE). Together, DVT and PE make up venous thromboembolism (VTE).

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Thrombosis: A Global Problem

Worldwide, one in four people die from causes related to thrombosis. Without addressing this disease head on, we cannot meet the World Health Assembly's global target to reduce premature non-communicable mortality by 25 percent by 2025.

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VTE: A Major Contributor of Disease Burden

Venous thromboembolism is a leading cause of death and disability worldwide. In Europe and the U.S., it claims more lives than AIDS, breast and prostate cancer, and motor vehicle crashes combined.

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Hospital-Associated VTE

Being in a hospital can increase your risk of developing VTE. Up to 60 percent of all VTEs are hospital-associated and more than 10 million cases occur every year - many of them preventable. VTE is the leading cause of preventable hospital death, ahead of infection and pneumonia.

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Know Atrial Fibrillation

Atrial Fibrillation (AFib) is a common type of arrhythmia, or irregular heartbeat. Because the heart beats and contracts irregularly, blood flow may slow or pool and cause the formation of a clot. This clot is an example of arterial thromboembolism. If it breaks free, it can lodge in an artery, travel to the brain and result in a stroke. Know the risk factors for a stroke. Take action.

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Personal Stories

Dr. Tetsumei Urano Appointed to the World Thrombosis Day Scientific Steering Committee

Global Movement Welcomes Medical Expert from Japan to Steering Committee More

10 Ways You Can Get Involved with the World Thrombosis Day Campaign

There is much you can do to help spread awareness, to get people talking about thrombosis and to support friends, family and colleagues. More

World Thrombosis Day Activity Ideas for 2016

Need ideas for the perfect event in your community? Here is your comprehensive list! More


Founding Global Partner

Bayer HealthCare

Global Partners

Boehringer Ingelheim Boston Scientific Bristol-Myers Squibb Daiichi-Sankyo Janssen Portola

Global Patron