Pneumothorax

Pneumothorax occurs when air enters the space between the lung and the chest wall, causing partial or complete lung collapse. Depending on the size of the air leak and its effect on breathing and circulation, it may range from a limited problem to a life-threatening emergency. ^[1][2]

What is pneumothorax?

The lungs normally remain expanded because of the pressure dynamics inside the pleural space. When air leaks into that space, the lung may collapse to varying degrees. Pneumothorax can occur spontaneously, after trauma, due to underlying lung disease, or as a complication of a medical procedure. In its most dangerous form, tension pneumothorax, pressure builds rapidly and can impair both breathing and circulation. For that reason, pneumothorax should not be understood merely as “air in the chest”; in some cases it is an emergency that requires immediate intervention. ^[1][2][3]

What symptoms can occur?

Typical symptoms include sudden chest pain and sudden shortness of breath. The pain may be sharp and may worsen with breathing. Some people develop a rapid heart rate, anxiety, cough, or reduced exercise tolerance. In more severe cases, visible respiratory distress, low oxygen levels, cyanosis, dizziness, or hemodynamic instability may occur. Tension pneumothorax can progress rapidly and may become fatal if not treated promptly. ^[1][2][4]

What causes it?

Pneumothorax can be categorized in several ways. Primary spontaneous pneumothorax occurs without obvious trauma, often in people without previously known lung disease, although subclinical blebs may be present. Secondary spontaneous pneumothorax occurs in the setting of underlying lung disorders such as COPD or other structural disease. Traumatic pneumothorax follows chest injury, and iatrogenic pneumothorax may occur during medical procedures. The cause matters because the risks, recurrence pattern, and management approach differ across these categories. ^[1][2][3]

How is it diagnosed?

Diagnosis is based on symptoms, physical examination, and imaging. Clinicians evaluate breathing difficulty, chest findings, oxygenation, and the overall stability of the patient. Chest X-ray is commonly used, and ultrasound or CT may also be useful depending on the setting. The key issue is not only confirming the presence of air in the pleural space but also determining how much the lung has collapsed and whether there is evidence of tension physiology. ^[1][2][4]

How is it treated?

Treatment depends on the size of the pneumothorax, the patient’s symptoms, the cause, and overall clinical stability. Small cases may be observed with oxygen and follow-up. More symptomatic or larger pneumothoraces may require aspiration or chest tube drainage. Tension pneumothorax requires immediate emergency decompression. There is no single universal treatment pathway, because management differs between small stable pneumothorax and a life-threatening emergency. ^[1][2][4]

Can it recur?

Yes. Recurrence is possible, particularly after spontaneous pneumothorax. The likelihood depends on factors such as smoking, underlying lung disease, and the type of pneumothorax. Some patients require follow-up and preventive planning because recurrent episodes can occur. ^[1][2][3]

When should emergency help be sought?

Emergency care is required for sudden chest pain with shortness of breath, marked respiratory distress, bluish discoloration, dizziness, faintness, or rapid worsening. A person with suspected pneumothorax should not attempt to “wait it out” at home if symptoms are significant. Tension pneumothorax is especially dangerous and requires immediate action. ^[1][2][4]

FAQ

Is pneumothorax the same as a collapsed lung?
Yes. Pneumothorax is commonly described as a collapsed lung. ^[1][2]

Can it happen without trauma?
Yes. Spontaneous pneumothorax can occur without obvious injury. ^[1][2]

Does every pneumothorax need a chest tube?
No. Some small, stable cases can be monitored, whereas others need drainage. ^[1][2]

Why is tension pneumothorax dangerous?
Because rising pressure can impair both breathing and circulation very quickly. ^[1][2]

Can it happen again?
Yes. Recurrence is possible, especially after spontaneous cases. ^[1][2]