D2I2.
genetic

Thrombophilia

Thrombophilia is an abnormality of blood coagulation that increases the risk of . Such abnormalities can be identified in 50% of people who have an episode of thrombosis that was not provoked by other causes. A significant proportion of the population has a detectable thrombophilic abnormality, but most of these develop thrombosis only in the presence of an additional risk factor.

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Plain-language summary adapted from Wikipedia. Not medical advice.