Pulmonary embolism
A pulmonary embolism is a sudden blockage in a lung artery, usually caused by a blood clot that travels from the legs. It is a critical condition that requires immediate medical attention to prevent lung damage or heart failure.
Overview
A pulmonary embolism is a sudden blockage in a lung artery, usually caused by a blood clot that travels from the legs. It is a critical condition that requires immediate medical attention to prevent lung damage or heart failure.
Understand this condition
The lungs depend on a steady flow of blood to pick up oxygen for the rest of the body. When a clot lodges in a lung artery, it acts like a dam, stopping blood from reaching lung tissue. This prevents the blood from getting oxygenated and puts dangerous pressure on the heart.
Why it happens
It typically starts as Deep Vein Thrombosis (DVT), where blood pools and clots in a leg vein. If the clot breaks loose, it travels through the heart and gets stuck in the narrow vessels of the lungs. This progression can happen rapidly after periods of immobility or injury.
Real-world scenarios
- •This often appears as sudden shortness of breath after a long flight.
- •People may notice sharp chest pain that worsens with deep breathing.
- •This often appears as calf swelling followed by rapid heart rate.
- •People may notice a persistent cough that produces bloody mucus.
Common vs serious explanations
- •Intercostal muscle strain from heavy lifting or exercise
- •A panic attack causing rapid breathing and chest tightness
- •Pleurisy caused by a minor viral infection
- •Bronchitis causing sharp pain while coughing
- Myocardial infarction or heart attack causing acute chest pressure
- Pneumothorax where a lung collapses suddenly
- Aortic dissection involving a tear in the main artery
- Pneumonia causing severe respiratory distress and low oxygen
Symptoms
Click any symptom to analyzeCauses
- •Deep vein thrombosis (DVT)
- •Blood clots traveling from legs to lungs
- •Surgery or trauma recovery
- •Long periods of immobility
Risk factors
- •Recent surgery or hospitalization
- •Cancer and certain treatments
- •Smoking and obesity
- •Extended travel or bed rest
- •Pregnancy or oral contraceptives
How it progresses
3 stages- OnsetSudden, severe symptoms — minutes matter.
- Critical windowTime-sensitive treatment dramatically changes outcome.
- RecoveryLong-term recovery and rehabilitation.
How it's diagnosed
- •CT pulmonary angiogram (CTPA)
- •D-dimer blood test
- •Ventilation-perfusion (VQ) scan
- •Chest X-ray and ECG
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •Anticoagulant medications (blood thinners)
- •Thrombolytic therapy (clot-busting drugs)
- •Surgical clot removal (embolectomy)
- •Insertion of a vena cava filter
- •Taking prescribed blood thinners consistently
- •Wearing compression stockings
- •Engaging in gentle movement as advised
- •Monitoring for signs of bleeding
Complications
- •Long-term damage if untreated
- •Heart strain
- •Reduced oxygen delivery
- •Risk of cardiac event
- •Recurrence of pulmonary embolism
Prevention
- •Don't smoke
- •Stay physically active
- •Manage blood pressure and cholesterol
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to pulmonary embolism
- Sudden shortness of breath
- Sharp chest pain when breathing in
- Coughing up blood
- Fainting or severe lightheadedness
- Rapid or irregular heartbeat
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Pulmonary embolism feel like a heart attack?
- ›Can Pulmonary embolism cause headaches?
- ›Is Pulmonary embolism reversible?
- ›How quickly does Pulmonary embolism progress?
- ›Is Pulmonary embolism hereditary?
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Frequently asked questions
Possible causes of Pulmonary embolism include Deep vein thrombosis (DVT), Blood clots traveling from legs to lungs, Surgery or trauma recovery, Long periods of immobility.
Pulmonary embolism can be serious and may require prompt medical attention, especially if symptoms are severe or worsening.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Pulmonary embolism typically benefits from medical evaluation and should not be ignored.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026