A pulmonary embolism (PE) is a blockage in one of the blood vessels (arteries) in the lungs - usually due to a blood clot. A PE can be in an artery in the centre of the lung or one near the edge of the lung.
This is a companion discussion topic for the original article at https://patient.info/signs-symptoms/breathlessness-and-breathing-difficulties-dyspnoea/pulmonary-embolism