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Collapsed Lung
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lungs Breathing

Collapsed Lung

A collapsed lung occurs when air enters the pleural space, potentially causing a total collapse known as pneumothorax or a partial collapse known as atelectasis.

Overview

A collapsed lung happens when air enters the pleural space, the area between the lung and the chest wall. If it is a total collapse, it is called pneumothorax. If only part of the lung is affected, it is called atelectasis.

Causes

Causes of a collapsed lung include:

  • Lung diseases such as pneumonia or lung cancer
  • Being on a breathing machine
  • Surgery on the chest or abdomen
  • A blocked airway

Symptoms and Diagnosis

If only a small area of the lung is affected, you may not have symptoms. If a large area is affected, you may feel short of breath and have a rapid heart rate.

A chest x-ray can tell if you have it. Treatment depends on the underlying cause.

Frequently Asked Questions

The most common and sudden symptom of a spontaneous pneumothorax is sharp, stabbing chest pain that often worsens when you take a deep breath or cough. This is frequently accompanied by sudden shortness of breath. In severe cases, you may experience a rapid heart rate, bluish lips or fingernails, and extreme anxiety or restlessness. If you have a history of lung disease or have recently had chest trauma, these symptoms are even more urgent. You should seek emergency medical attention immediately if you experience sudden chest pain and difficulty breathing, as a large collapse can compromise oxygen exchange rapidly.
pneumothorax is a collapse caused by air leaking into the pleural space (the area around the lung), pushing the lung away from the chest wall. Atelectasis is a collapse caused by the alveoli (air sacs) deflating due to a blockage in the airway or lack of deep breathing, often after surgery. Treatment for pneumothorax involves removing the air from the pleural space, often with a needle or chest tube. Treatment for atelectasis focuses on reopening the airways and re-inflating the lungs through deep breathing exercises, incentive spirometry, coughing, and sometimes bronchoscopy to clear mucus plugs.
Yes, a primary spontaneous pneumothorax can occur without any obvious injury or underlying lung disease, often in tall, thin young men or during activities like scuba diving or heavy weightlifting that change intrathoracic pressure. This is distinct from a secondary spontaneous pneumothorax, which occurs in people with underlying lung conditions like COPD, asthma, or cystic fibrosis. Secondary collapses are generally more serious because the underlying lung tissue is less healthy and less able to re-expand, often requiring more aggressive treatment such as chest tube insertion rather than simple observation.
The time for full re-expansion varies; a small pneumothorax may resolve within a few days with observation, while a larger one treated with a chest tube may take several days to a week to fully re-expand. During recovery, you should avoid activities that increase pressure in the chest, such as heavy lifting, strenuous exercise, or straining during bowel movements. You must also avoid flying in an airplane or scuba diving until your doctor confirms the lung has fully healed, as changes in air pressure can cause the air leak to recur. Follow-up imaging is usually required to ensure the lung remains inflated before returning to normal activity.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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