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What is Thrombosis?

Thrombosis is the formation of a blood clot, known as a thrombus, within a blood vessel causing a partial or total obstruction; it prevents blood from flowing normally through the circulatory system. When the blood clot flows through the body, it can harm important organs such as the brain, heart, lungs, or leg arteries. When it blocks blood flow, serious health issues can arise, such as stroke, heart attack, or pulmonary embolism.

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Educational Resources

NATF is dedicated to providing patients with the information they need to continue living a healthy life after being diagnosed with a blood clot. From videos with experts addressing patient questions to printable materials and further resources, NATF provides patients with the tools they need to make informed healthcare decisions.

Upcoming Patient Events

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Mar 16
Boston Blood Clot Support Group – March
Apr 20
Boston Blood Clot Support Group – April
May 18
Boston Blood Clot Support Group – May

Melissa H.

In the winter of 2007, Melissa Hogan woke up with a swollen leg and ankle. As a healthy 24-year-old, she had no idea what was causing the swelling. At her…
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Brenda is a dedicated mother and hardworking professional that experienced a deep vein thrombosis (DVT or a blood clot in the leg) after surgery. She attends NATF’s in-person blood clot…
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Sam R.

Sam, an athletic 21 year-old, experienced her blood clots while studying at Colby College in Maine. Inspired by her experience, she is interning this summer at the Thrombosis Research Group…
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Patient Support

After experiencing a blood clot, it’s normal to have a lot of questions. Many people are left feeling confused about why this happened to them and anxious about it happening again. NATF is here to be be a support system. We are proud to offer a Boston-based in-person support group, as well as an online support group. Support Groups

Start Your Journey Towards Recovery

NATF is here for you. Sign up to receive a Thriving with Thrombosis packet, specifically designed for newly diagnosed blood clot patients, in the mail today to get all of the information you need for your journey towards recovery.


Sign Up Today

Join NATF in the fight against blood clots. Donate today.

Make a donation

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