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Pulmonary Embolism (Blood Clot in Lungs): Symptoms, Causes and Treatment

  • Posted on- Aug 25, 2015
  • 382 Views

When a clot is suddenly formed in the artery of the lung, the condition is termed as pulmonary embolism. The clot can be either formed by air, fat, blood, or unwanted growth of cells. However, blood clots are the most common cause of blockage in the pulmonary artery. Although the clot is found in the lungs, it was actually formed in the veins of the lower regions of the body, such as the leg, pelvis, arms or even heart.

The clot formed in the leg gets dislodged and travels from its site of origin, into the vessels of the lungs. This clot that travels from one part of the body to another part is termed as embolus. It continues to move into the smaller and narrower vessels of the lungs, until it comes to such a narrow vessel, which does not permit it to go any further. This results in the wedging of the clot in the blood vessel.

The clot wedge prevents blood from travelling past it to the other side of the lung, thereby preventing that portion of the lung from receiving oxygen. Thus, a blood clot in the lung is formed. Lack of oxygen supply causes death of lung tissue. The body is seen to break up the small clots quickly and tries to keep the damage minimum. However, large clots or emboli can cause the particular lung area to die and can even result in death.

Causes of Pulmonary Embolism

The most common cause of pulmonary embolus formation is deep vein thrombosis (DVT). People prone to DVTs are the ones who are at a higher risk of getting pulmonary embolism. In rare cases, fat droplets, amniotic fluid, clumps of parasites, tumour cells, or even air bubbles are seen to cause the clot in lungs. Precipitating factors that can trigger this type of clot formation are:


Prolonged immobilization can result in clot formation in the arms and legs. Further, in some cases extended travel in cars, airplane, etc. can also lead to clot formation. This is because the blood is allowed to stay in one position for a long period of time. Those people who have clotting disorders are at greater risk of developing pulmonary embolism.

Symptoms of Pulmonary Embolism

The symptoms of pulmonary embolism are vague and not all these symptoms are necessarily seen. Moreover, some may not experience any kind of symptoms as well. The initial symptom of pulmonary embolism that is in the deep thrombosis stage is pain in the calf muscle. The leg may be warm and tender to touch, making it difficult to even walk. However, this may disappear in a few days time. Once the clot reaches the lungs, the symptoms are different. Some of the commonly observed signs are:
  • Apprehension and anxiety
  • Chest pain (sharp, stabbing pain), which worsens on breathing or coughing
  • Dry cough (sometimes bloody sputum is also observed)
  • Low blood pressure
  • Rapid heart rate (tachycardia)
  • Sweating
  • Nasal flaring
  • Clammy skin
  • Pelvic pain
  • Shortness of breath at rest or with exertion
  • Dizziness or passing out
  • Swelling in the legs (lower extremities)
  • Bluish tinge to the skin
  • Lump associated with a vein near the surface of the body
  • Splinting of ribs with breathing (bending over or holding the chest)
  • Mild fever

In more serious cases, wherein the clot is a larger one, the symptoms may be as severe as losing consciousness, breaking into cold sweats, bluish discoloration on the fingers and lips, or even death.

Treatment of Pulmonary Embolism

Blood thinning medicines that are anticoagulants are given to decrease the blood’s ability to form clots. They do not break up the already formed clots however, they prevent the further enlargement of blood clots. These anticoagulants can be taken in the form of pills, injections, or intravenously via a needle inserted into the vein. Heparin and Warfarin are the usually prescribed anticoagulants. However, Warfarin is dangerous during pregnancy, thus only heparin is given to pregnant women. Heparin works really quickly in the body, however, requires regular monitoring of the anticoagulation levels in the blood. For patients who cannot take heparin, a new anticoagulant called Thrombin inhibitor is given.

When pulmonary embolism is severe and life-threatening, the patient is immediately hospitalized. The doctors resort to definitive treatment such as thrombolytic therapy (clot dissolving or clot busting therapy) in order to dissolve the clot. Thrombolytics are medicines given to dissolve clots only in emergency situations. This is because these medicines can cause sudden bleeding. Moreover, pregnant women, people with hypertension, people who have incurred strokes recently, etc. are not given these thrombolytics. This is because the risk of bleeding is higher in these individuals.

People who are at risk of pulmonary embolism must try to prevent the formation of blood clots in their bloodstream by being active. Moving around as much as possible will help prevent the formation of clots. While travelling in an airplane, one must get up every hour and walk around. During extended car journeys, stop every two hours and stretch your legs and walk. Prevention is better than cure!