Pneumonic embolism (PE) is a blockage of a vein in the lungs by a substance that has moved from somewhere else in the body through the circulatory system (embolism). Manifestations of a PE may incorporate brevity of breath, chest torment especially after taking in, and hacking up blood. A condition in which one or more arteries in the lungs become blocked by a blood clot. Symptoms include shortness of breath, chest pain and cough. Prompt treatment to break up the clot greatly reduces the risk of death. This can be done with blood thinners and drugs or procedures. Compression stockings and physical activity can help prevent clots from forming in the first place.