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World Thrombosis Day

Funded by the International Society on Thrombosis and Haemostasis, ISTH

Recognized on 13 October, the birthday of Rudolf Virchow, pioneer in the pathophysiology of thrombosis, World Thrombosis Day (WTD) focuses attention on the often overlooked and misunderstood disease of thrombosis.

With hundreds of educational events in countries around the world, WTD and its partners place a global spotlight on thrombosis as an urgent and growing health problem.

The World Thrombosis Day campaign seeks to increase global awareness of thrombosis, including its causes, risk factors, signs/symptoms and evidence-based prevention and treatment. This mission supports the World Health Assembly's global target of reducing premature deaths by non-communicable disease by 25 percent by 2025, as well as the World Health Organization's global action plan for the prevention and control of non-communicable diseases between 2013 and 2020.

World Thrombosis Day was founded in 2014 by the International Society on Thrombosis and Haemostasis (ISTH) in response to members' requests for a focused global awareness day on thrombosis. Nearly 200 organizations worldwide participated in the first day, raising much-needed visibility of the disease through special events, educational forums, widespread media coverage and social media.

New organizations around the world join our movement every day.

Share in the cause and sign up online

To learn more, visit