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Pulmonary embolism occurs when a clot that has travelled from another part of the body blocks the blood supply to the lung. It commonly arises from adeep vein thrombosis (DVT).Pulmonary embolism ultimately damages areas of the lung, causing reduced oxygen levels in the blood that can potentially lead to death. Therefore, it is a serious medical condition that needs prompt medical treatment.Bloodclotting is a normal bodily function that helps to prevent bleeding. Normally, blood clots form and then break down in a continuous process. Under certain conditions, the body cannot break them down, which can lead to potentially serious consequences.A thrombus is a blood clot that partially blocks a blood vessel. An embolus occurs when this thrombus becomes dislodged from where it has formed and travels through thebloodstream until it becomes lodged in a narrower blood vessel.Clots most commonly occur in the deep veins of the leg, causingdeep vein th