OVERVIEW
A pneumothorax occurs when air leaks into the space between the lung and the chest wall (pleural space), causing the lung to collapse partially or completely. This condition can be spontaneous or caused by trauma or medical procedures.
What is a pneumothorax?
A pneumothorax (collapsed lung) happens when there’s air in the space between your chest wall and your lung (pleural space). Air in the pleural space can build up and press against your lung, causing it to partially or fully collapse. Pneumothorax is also called a punctured lung. A pneumothorax can be a medical emergency. Go to the nearest emergency department right away if you think you could have collapsed lung.

Types of Pneumothorax
1. Spontaneous Pneumothorax:
- Primary: Occurs without any apparent cause, often in tall, young males.
- Secondary: Develops due to an underlying lung disease, such as COPD or cystic fibrosis.
2. Traumatic Pneumothorax: Results from an injury to the chest, such as a rib fracture, gunshot wound, or stabbing.
3. Tension Pneumothorax: A severe and life-threatening condition where air enters the pleural space and cannot escape, leading to increased pressure that can compress the lung and shift the mediastinum.
Symptoms
Causes

What are the Risk Factors for this Condition?
You might be more at risk for a collapsed lung if you:
- Have a family history of pneumothorax.
- Are pregnant.
- Have a tall, thin body type, especially if you were assigned male at birth (AMAB).
- Have Marfan syndrome.
- Have endometriosis.
How is Pneumothorax Diagnosed?
Providers usually diagnose a collapsed lung by listening to your lungs and by using imaging. This includes chest X-rays, CT scans (computed tomography scans) or a lung ultrasound. They may also use an arterial blood gas test to measure the levels of oxygen and carbon dioxide in your blood.
Your healthcare provider will ask about your history of lung disease and perform a physical exam. Some types of pneumothorax, like a tension pneumothorax, are diagnosed based on symptoms.