Pneumothorax: Understanding Collapsed Lung Causes and Care
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
A pneumothorax occurs when air enters the space between the lung and chest wall, causing the lung to collapse. Key signs include sudden chest pain, shortness of breath, and bluish skin or nails. Tension pneumothorax is a life-threatening medical emergency requiring immediate intervention, and treatment ranges from simple observation to chest tube drainage or surgical repair.
Quick Answer
Pneumothorax, commonly known as a collapsed lung, is a condition in which air collects in the pleural space between the lung and the chest wall, preventing the lung from expanding and causing a partial or total collapse. It can result from injuries or lung disease, or occur spontaneously. Minor cases may heal with observation, while severe cases need emergency treatment. [1]
What the research says
In a randomized trial, most people with a first large spontaneous pneumothorax recovered with observation alone. The trial enrolled 316 patients aged 14 to 50 with a first, uncomplicated, moderate-to-large primary spontaneous pneumothorax. In the observation group, 84.6% never needed an intervention, and the lung had re-expanded within 8 weeks in 94.4% (118 of 125) compared with 98.5% (129 of 131) in the immediate-intervention group. Observation was judged noninferior, with a lower risk of serious adverse events and recurrence, although the result was not robust to conservative assumptions about missing data (Brown et al., N Engl J Med, 2020).
Pooled data agree that observation can work for selected patients. A meta-analysis of 8 studies with 1,342 patients found similar success rates for conservative and interventional management (RR 1.05; 95% CI 0.94–1.17) and no significant difference in recurrence (RR 1.43; 95% CI 0.45–4.55). Complications occurred in 6.05% of conservatively managed patients versus 26.89% of those treated with an intervention, a difference that was not statistically significant (Liu et al., Am J Emerg Med, 2020).
Surgery after a first collapse can lower the chance of it coming back. In a randomized trial of 181 young patients with a first primary spontaneous pneumothorax, 43 (23.8%) had a recurrence during follow-up. Recurrence was significantly lower with thoracoscopic surgery plus chest tube treatment than with chest tube treatment alone, especially in people whose CT scans showed bullae of 1 cm or larger (Olesen et al., Eur J Cardiothorac Surg, 2018).
Research summaries are based on article abstracts retrieved from PubMed. Whether observation is appropriate depends on the individual and should only be decided by a clinician.
What is a Pneumothorax?
A pneumothorax happens when air leaks into the pleural space, the area between your lung and your chest wall. As air builds up, it pushes against the lung, causing it to deflate. This condition is often referred to as a punctured lung and can range from a minor issue to a critical medical emergency depending on the volume of air trapped. [1]
The severity of a collapsed lung is determined by how much of the lung has deflated and the underlying cause. Prompt diagnosis is essential to prevent complications such as respiratory or heart failure. [1]
What are the types of collapsed lung (pneumothorax)?
Pneumothorax is classified into several types based on how the air entered the chest cavity. Understanding these categories helps healthcare providers determine the most appropriate course of action.
Type | Description | Common Causes |
Spontaneous | Occurs without a specific injury | Ruptured air pockets (blebs) or lung disease |
Traumatic | Caused by a physical injury | Fractured ribs, stab wounds, or accidents |
Iatrogenic | Occurs during a medical procedure | Lung biopsies or central line insertions |
Tension | Air enters but cannot escape | Severe pressure build-up; this is an emergency |
A particularly dangerous form is tension pneumothorax, where a one-way valve effect causes pressure to rise rapidly within the chest, potentially shifting internal organs and requiring immediate emergency care. [1]
What are the symptoms of a collapsed lung (pneumothorax)?
A collapsed lung often causes sudden symptoms, such as one-sided chest pain and shortness of breath, that need emergency care right away. If you experience any of the following signs, you should seek medical attention at the nearest emergency department immediately:
Sudden Chest Pain: Typically felt on one side and worsening when taking a breath.
Shortness of Breath: Difficulty breathing or feeling like you cannot get enough air.
Physical Signs: A fast heart rate, rapid breathing, and fatigue.
Cyanosis: A bluish tint to the skin, lips, or fingernails, indicating low oxygen levels. [1]
What causes a collapsed lung and who is at risk?
A pneumothorax can be triggered by medical conditions, physical trauma, or certain lifestyle factors. Underlying lung diseases such as asthma, COPD, pneumonia, and cystic fibrosis significantly increase the risk of a spontaneous collapse. [1]
Lifestyle factors also play a role; smoking and the use of inhaled drugs are known contributors. Additionally, activities involving drastic changes in air pressure, such as scuba diving or flying, can trigger a collapse in susceptible individuals. Those with a tall, thin body type or a family history of the condition may also be at higher risk. [1]
How is a collapsed lung diagnosed and treated?
Healthcare providers diagnose a collapsed lung through physical examinations and imaging tests like chest X-rays, CT scans, or ultrasounds. Treatment is tailored to the size and severity of the collapse. [1]
Observation and Oxygen: Minor collapses may be monitored closely as the body reabsorbs the air naturally.
Thoracentesis: A needle is used to quickly remove excess air from the chest cavity.
Chest Tube Drainage: A flexible tube is inserted to continuously drain air, allowing the lung to re-expand over several days.
Pleurodesis: A procedure where chemicals are used to attach the lung to the chest wall, preventing future collapses. [1]
What is recovery and outlook after a collapsed lung?
Most people who experience a punctured lung can fully recover within a few days to two weeks. During this time, the body reabsorbs the trapped air, and the lung gradually reinflates. However, there is a risk of recurrence, and patients should discuss long-term prevention strategies with their doctor. [1]
Conclusion
Pneumothorax is a serious condition that requires prompt medical evaluation. Whether it occurs spontaneously or due to an injury, understanding the symptoms and seeking immediate care can prevent life-threatening complications. With proper treatment, most individuals return to their normal activities following a successful recovery. If you have a history of lung issues or experience sudden chest pain, consult a healthcare professional.
Frequently Asked Questions
What is the most common symptom of a collapsed lung?
Sudden chest pain on one side and shortness of breath are the most frequent symptoms reported by patients.
Is a pneumothorax always a medical emergency?
While some small collapses can be monitored, any suspected pneumothorax should be evaluated by a doctor immediately, as it can become life-threatening.
How long does it take for a collapsed lung to heal?
Most cases heal within a few days to two weeks, depending on the severity and the treatment provided.
Can smoking cause a collapsed lung?
Yes, smoking is a significant lifestyle risk factor that increases the likelihood of developing a spontaneous pneumothorax.
What is a tension pneumothorax?
A tension pneumothorax is a severe, life-threatening type where air builds up pressure in the chest and cannot escape, requiring immediate emergency intervention.
Will I need surgery for a punctured lung?
Surgery is usually reserved for cases that do not respond to other treatments, involve both lungs, or recur frequently.
Can I fly or scuba dive after a pneumothorax?
You should avoid activities with drastic air pressure changes until cleared by your doctor, as these can trigger another collapse.
What is pleurodesis?
Pleurodesis is a procedure that uses chemicals to stick the lung to the chest wall, effectively closing the space where air could get trapped.
How do doctors diagnose the condition?
Diagnosis is typically confirmed using imaging tests such as chest X-rays, CT scans, or lung ultrasounds.
Can a collapsed lung happen again?
Yes, there is a chance of recurrence. Discussing your specific risk factors with a healthcare provider is important for long-term health.
Related Reading
Learn more in our guide to Pleurodesis: Chemical vs. Mechanical, Procedure, Success Rates and Recovery.
Learn more in our guide to Bullectomy.
Point-of-Care Ultrasound (POCUS): What It Is, Uses and How It Differs From a Standard Scan explains the bedside ultrasound clinicians use for quick, focused answers.
Thoracoscopy: Types, How It's Done, Risks and Recovery explains the camera procedure used to see inside the chest and sample the pleura.
Lung Biopsy: Types, What to Expect, Recovery, Risks and Results explains the biopsy types used to sample lung tissue.
References
Cleveland Clinic. Pneumothorax (Collapsed Lung). Cleveland Clinic Health Library. Last updated November 16, 2023. https://my.clevelandclinic.org/health/diseases/15304-collapsed-lung-pneumothorax
Brown SGA, Ball EL, Perrin K, et al. Conservative versus Interventional Treatment for Spontaneous Pneumothorax. N Engl J Med. 2020;382(5):405-415. PMID: 31995686. https://doi.org/10.1056/NEJMoa1910775
Liu WL, Lv K, Deng HS, et al. Comparison of efficiency and safety of conservative versus interventional management for primary spontaneous pneumothorax: A meta-analysis. Am J Emerg Med. 2020;45:352-357. PMID: 33046307. https://doi.org/10.1016/j.ajem.2020.08.092
Olesen WH, Katballe N, Sindby JE, et al. Surgical treatment versus conventional chest tube drainage in primary spontaneous pneumothorax: a randomized controlled trial. Eur J Cardiothorac Surg. 2018;54(1):113-121. PMID: 29509892. https://doi.org/10.1093/ejcts/ezy003
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have about a medical condition.
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