Collapsed Lung (Pneumothorax): The Warning Signs Doctors Treat as Emergencies

A collapsed lung—medically known as a pneumothorax—occurs when air leaks into the space between your lung and chest wall. This air buildup puts pressure on the lung, causing it to partially or fully collapse. While minor pneumothoraces can sometimes resolve on their own, others become medical emergencies. Recognizing the warning signs early can make a significant difference in outcomes.

What Is a Collapsed Lung?

• The lung sits against the chest wall, sealed by a thin membrane (the pleura).
• If air escapes from the lung into the pleural space, the lung can no longer fully expand when you breathe.
• Severity ranges from small, stable leaks to large or tension pneumothoraces that compromise breathing and blood flow.

Types of Pneumothorax

1. Primary Spontaneous Pneumothorax

   • Occurs without an obvious cause or underlying lung disease.
   • Often affects tall, thin young adults and smokers.

2. Secondary Spontaneous Pneumothorax

   • Develops in people with existing lung conditions (e.g., COPD, cystic fibrosis, tuberculosis).

3. Traumatic Pneumothorax

   • Results from chest injury (e.g., rib fracture, penetrating wound, high‐pressure ventilation).

4. Iatrogenic Pneumothorax

   • Caused by medical procedures (e.g., central line placement, lung biopsy).

5. Tension Pneumothorax

   • A life‐threatening form where trapped air builds pressure, shifting organs and severely impairing breathing and blood circulation.

Warning Signs and Emergency Symptoms

Doctors consider the following warning signs immediate reasons for emergency evaluation and treatment:

Common Early Symptoms

• Sudden, sharp chest or shoulder pain (often one‐sided)
• Shortness of breath or rapid breathing
• A feeling of tightness in the chest

Vital Sign Changes

• Rapid heart rate (tachycardia)
• Low blood pressure (hypotension) in severe cases
• Rapid breathing (tachypnea)

Physical Exam Findings

• Diminished or absent breath sounds on one side
• Hyper‐resonance (a hollow sound) when tapping the chest wall
• Decreased chest movement on the affected side

Red Flags for Tension Pneumothorax

• Severe shortness of breath, worsening quickly
• Distended neck veins (jugular venous distension)
• Tracheal deviation (windpipe shifts away from the affected side)
• Cyanosis (bluish lips or fingertips)
• Altered mental status due to low oxygen or blood pressure

Who Is at Higher Risk?

• Young, tall, thin males (primary spontaneous)
• Smokers and those exposed to secondhand smoke
• People with chronic lung diseases (COPD, bronchiectasis)
• Recent chest trauma or invasive lung procedures
• Mechanical ventilation in intensive care settings

Diagnosing Pneumothorax

Doctors confirm a pneumothorax using:

• Chest X-ray: The most common initial test; shows air in the pleural space and lung collapse.
• Ultrasound: Quick bedside tool, especially in trauma or critical care.
• CT Scan: Highly sensitive; used when X-rays are inconclusive or detailed anatomy is needed.

Laboratory tests (blood gases) may assess oxygen and carbon dioxide levels if breathing is compromised.

Treatment Options

Treatment depends on the size of the pneumothorax, symptoms, and type:

Observation and Oxygen Therapy

• Small, stable pneumothoraces may reabsorb air on their own.
• Supplemental oxygen can speed up the reabsorption process.

Needle Aspiration or Decompression

• Involves inserting a needle or small catheter to remove trapped air.
• Often used for moderate‐sized primary spontaneous pneumothorax.

Chest Tube (Thoracostomy)

• A tube is placed between ribs into the pleural space to continuously drain air.
• Attached to a one‐way valve or suction to help the lung re‐expand.

Surgery (Video‐Assisted Thoracoscopic Surgery, VATS)

• Considered for recurrent pneumothorax or large air leaks.
• Involves closing blebs (small air blisters) and "pleurodesis" (causing pleural layers to stick together).

Emergency Needle Decompression

• Immediate lifesaving step for tension pneumothorax.
• A large‐bore needle is inserted quickly into the chest to relieve pressure, followed by chest tube placement.

When to Seek Immediate Help

Even if you're unsure whether your symptoms are severe, it's better to err on the side of caution. If you're experiencing sudden chest pain or breathing difficulties, you can use Ubie's free AI-powered Spontaneous Pneumothorax symptom checker to help you understand whether your symptoms may require urgent medical attention. Seek emergency care immediately if you experience:

• Sudden chest pain, especially on one side
• Worsening shortness of breath
• Lightheadedness or feeling faint
• Rapid heart rate or difficulty speaking in full sentences
• Any signs of tension pneumothorax (see Red Flags above)

Preventing Recurrences

• Quit Smoking: Lowers the risk of bleb formation and spontaneous leaks.
• Manage Lung Diseases: Adhere to treatments for COPD, asthma, cystic fibrosis, or other conditions.
• Avoid High-Risk Activities: Scuba diving or high‐altitude flying without medical clearance if you've had prior pneumothorax.
• Regular Follow-Up: If you've had a pneumothorax before, follow up with your doctor for lung checks and imaging as recommended.

Speak to a Doctor

A pneumothorax can be life‐threatening if not treated promptly. If you experience any serious symptoms—or if your free online symptom check indicates risk—seek emergency care or contact your healthcare provider immediately. Always speak to a doctor about anything that could be life threatening or serious.