PE is the term used to describe a blood clot (or multiple clots) that have become lodged in the blood vessels of the lung. A PE usually starts as a clot in the deep veins of the leg (when it is called a deep vein thrombosis or DVT) and can break away and travel to the lung. 

See more information below: 

https://www.brit-thoracic.org.uk/document-library/quality-standards/pulmonary-embolism/appendix-4/  

Once you have been diagnosed with pulmonary embolism (PE), it is very important that you take blood thinners every day as prescribed. The blood thinner is usually in the pill form or sometimes as injections that give yourself under the skin. There are various oral blood thinners (anticoagulants) available. This fact sheet describes the different type of blood thinners, monitoring that is needed while on blood thinners, and how to prevent future blood clots from developing. 

See below for more information: 

https://craftprd1.blob.core.windows.net/documents/advocacy-patients/patient-resources/pe-long-term-treatment-prevention.pdf