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What is a pulmonary embolism?

A pulmonary embolism (PE) is a blood clot in the blood vessels of your lung. This happens when a clot in another part of your body (often your leg or arm) moves through the veins to your lung. A PE restricts blood flow to your lungs, lowers oxygen levels in your lungs and increases blood pressure in your pulmonary arteries.

Without quick treatment, a pulmonary embolism can cause heart or lung damage and even death.