Blood clots form when blood thickens, forming a semisolid mass. They normally only form if a blood vessel is injured, such as if there is a cut to the skin, and bleeding starts. The blood thickens and forms a clot at the site of the cut to stop the bleeding.

If a blood clot blocks blood flow to the heart, it can lead to a heart attack. If it occurs in an artery to the brain, it can cause a stroke. If it occurs in arteries in the limbs, it can lead to peripheral artery disease.

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What are blood clots?
How do blood clots form?
Blood clot causes
Types of blood clots
Problems caused by blood clots
Blood clot symptoms
The risk of blood clots
Preventing blood clotting
Blood clot treatment
How is HRI fighting blood clots?

Blood clots: symptoms and causes

Get the facts about blood clot symptoms and causes