A pulmonary embolism is most likely caused by a clot reaching

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A pulmonary embolism occurs when a blood clot from another part of the body, most commonly from the legs, travels through the bloodstream and gets lodged in one of the pulmonary arteries in the lungs. This obstruction can cause significant damage, and even life-threatening complications, by limiting blood flow to the lungs and reducing oxygen levels in the body. Pulmonary embolisms can also originate from the deep veins in the pelvis, abdomen, or arms, though these are less common.

A Pulmonary Embolism Is Most Likely Caused by a Clot