Pulmonary Embolism
A pulmonary embolism is a blockage of one or more arteries in the lungs. It is most often caused by a blood clot that traveled to the lungs from another part of the body. Blood clots usually form in the veins of the legs or arms, but can dislodge and travel through the bloodstream to the lungs. While a pulmonary embolism is not usually fatal, it is a complication of deep vein thrombosis and can be life threatening.