(HealthDay News) — Blood clotting is the body’s way of preventing excessive bleeding when a blood vessel is injured.

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Typically, the body will dissolve the clot after the injury has healed,the American Society of Hematology says.

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But occasionally, a clot forms despite no obvious injury to a vessel, or the clot doesn’t dissolve on its own. This can pose the dangerous possibility of limiting oxygenated blood to tissues and organs such as the heart or lungs.

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Or a clot may impede the flow of deoxygenated blood back to the heart.

The society says factors that can increase the risk of developing a blood clot include:

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