Pulmonary Embolism is blockage in one or more arteries in your lungs. In most cases, pulmonary embolism is caused by blood clots that travel to your lungs from another part of your body – most commonly, your legs. Pulmonary embolism is a complication of deep vein thrombosis (DVT), which is clotting in the veins farthest from the surface of the body. Common signs and symptoms include sudden and unexplained shortness of breath, chest pain and a cough that may bring up blood-tinged sputum.
Pulmonary Embolism, Mayo Clinic, https://www.mayoclinic.org/diseases-conditions/pulmonary-embolism/multimedia/pulmonary-embolism/img-20006463