World Thrombosis Day - October 13
Mon, Oct 13, 2025

World Thrombosis Day

World Thrombosis Day is observed around the world on October 13th. Worldwide, diseases associated with thrombosis are the cause of one in four deaths. In the US alone, blood clots affect up to 900,000 people each year, and approximately 300,000 of them will die. For example, it is worth noting that the number of deaths from blood clots in a year exceeds the number of deaths from breast cancer, car accidents, and even AIDS in the same time period.

History

On October 13, 2014, the first World Thrombosis Day was held with the purpose of drawing attention to this serious issue. This is an educational project led by the International Society for Thrombosis and Hemostasis (ISTH). Control is carried out by specialists in the fields of medicine and public health. The main goal of World Thrombosis Day is to raise global awareness of thrombosis, its causes, symptoms, and risk factors. The ultimate aim is to reduce the number of people who die or become disabled due to this disease.

The World Health Assembly aims to reduce the overall rate of premature deaths due to noncommunicable diseases by 25% by 2025.

Interesting facts

  • The first documented case of thrombosis was in 1271.
  • In 1600, Mercurialis observed blood clots forming in blood vessels at normal body temperature.
  • In 1628, English physician William Harvey introduced the first study of circulation.

How to take part

On World Thrombosis Day, learn more about thrombosis and consult with doctors about the topic. If you have survived thrombosis, share your story on social media using the hashtag #WorldThrombosisDay – your story and experience could help someone else. On this day, you can also take part in thematic events, such as webinars and seminars with medical experts, and watch interviews with people who have experienced thrombosis.

When is World Thrombosis Day in 2025?

World Thrombosis Day is observed on October 13 each year.

Observations

Weekday Month Day Year
Monday October 13 2025
Tuesday October 13 2026
Wednesday October 13 2027
Friday October 13 2028
Saturday October 13 2029