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Pulmonary embolism

3-minute read

A pulmonary embolism is a blockage in the arteries that supply blood to the lungs caused by one or more blood clots. A blood clot can form in the veins of the legs, pelvis, abdomen (tummy) or in the heart.

The clot can then dislodge from where it first forms and travel in the blood stream to lodge in one of the pulmonary arteries, the arteries that send blood to the lungs.

A major pulmonary embolism can be fatal. If you think you may have a pulmonary embolism, go to the nearest emergency department or dial triple zero (000) to call an ambulance.

Illustration showing a normal vein in comparison to thrombosis and pulmonary embolism.
The most serious complication of DVT is pulmonary embolism, when a piece of the blood clot breaks off and travels in the bloodstream into the blood vessels in the lungs.

Pulmonary embolism symptoms

Most people with pulmonary embolism have some symptoms, but they can be mild.

Symptoms can include:

Other symptoms include:

Pulmonary embolism risk factors

You are at higher than usual risk of a pulmonary embolism if you haven’t been moving for long periods such as extended travel or being in hospital.

You are also at a higher than usual risk if:

Pulmonary embolism diagnosis

If your doctor thinks you may have a pulmonary embolism, they will talk to you and examine you.

You will be asked to have some tests, such as:

If you are low risk of having a pulmonary embolism, you may not need extra scans. The Royal Australian and New Zealand College of Radiologists recommend that if your doctor suspects you have a pulmonary embolism, you should ask about the most appropriate test for diagnosis. For further information, visit the Choosing Wisely Australia website.

Complications of pulmonary embolism

A small pulmonary embolism might cause few problems. But a large pulmonary embolism is serious, and can cause heart problems, lung problems or even sudden death.

About a 1 in 3 people who have a pulmonary embolism have another one later.

Pulmonary embolism treatments

Emergency treatment of pulmonary embolism involves:

  • oxygen through a mask
  • anticoagulant medicines to dissolve blood clots
  • surgery to remove a clot (in very serious cases)

Pulmonary embolism prevention

If you are at risk of having a pulmonary embolism, you should not smoke. You will learn what medicines to avoid, and you may need medicine to thin the blood. A few people are advised to have surgery to put a small filter in the main vein in the abdomen, in an effort to catch clots before they reach the lungs.

If you are having surgery, your doctors and nurses will reduce your risk of having a pulmonary embolism by:

  • keeping you in hospital for as short a time as possible
  • offering medicine, compression stockings and perhaps a machine that pumps the leg muscles while a person is unable to walk, to prevent blood clots forming in the legs of patients following surgery

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Last reviewed: March 2019

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