Atelectasis
Atelectasis is the partial or complete collapse of a lung or a section (lobe) of a lung. It occurs when the tiny air sacs (alveoli) within the lung become deflated or filled with alveolar fluid.
Overview
Atelectasis is the partial or complete collapse of a lung or a section (lobe) of a lung. It occurs when the tiny air sacs (alveoli) within the lung become deflated or filled with alveolar fluid.
Understand this condition
The lungs are made of tiny sacs called alveoli that should stay inflated like balloons. In atelectasis, these sacs lose air and flatten, preventing oxygen from entering the bloodstream. This makes the affected part of the lung useless for breathing until it reflates.
Why it happens
It occurs when pressure outside the lung or a blockage inside the airway stops air flow. This usually starts with shallow breathing or a mucus plug that traps air in the sacs. Over time, the trapped air is absorbed by the body, causing the sacs to deflate.
Real-world scenarios
- •This often appears as shortness of breath after abdominal surgery.
- •People may notice a persistent cough after inhaling food or small objects.
- •This often appears as sharp chest pain during deep inhalations.
- •People may notice rapid, shallow breathing while recovering from an injury.
Common vs serious explanations
- •Temporary shallow breathing after recent surgery
- •Mild mucus buildup from a common cold
- •Inactivity or prolonged bed rest after illness
- Pneumothorax, where air leaks into the space around the lung.
- Severe pneumonia causing significant lung inflammation.
- A large tumor obstructing a primary bronchial tube.
- Pulmonary embolism blocking blood flow to lung tissue.
Symptoms
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Causes
- •Blockage of the airway by mucus or a foreign object
- •Pressure from outside the lung (pleural effusion or tumor)
- •Shallow breathing due to pain or anesthesia
- •Scarring of lung tissue
Risk factors
- •Recent abdominal or chest surgery
- •Prolonged bed rest or immobility
- •Chronic lung diseases like COPD or asthma
- •Smoking
- •Obesity
How it progresses
3 stages- OnsetSymptoms appear, often triggered by a known cause.Often missed
- Active phaseSymptoms peak; self-care or short treatment usually helps.
- ResolutionSymptoms ease over days to weeks with proper care.
How it's diagnosed
- •Chest X-ray
- •Chest CT scan
- •Pulse oximetry to measure oxygen levels
- •Bronchoscopy
Treatment options
General educational information only — no dosage advice. Always follow guidance from a qualified clinician.
- •Chest physiotherapy (percussion)
- •Inhaled medications to open airways
- •Suctioning of mucus or blockages
- •Continuous positive airway pressure (CPAP)
- •Deep breathing exercises (incentive spirometry)
- •Frequent position changes
- •Increasing fluid intake to thin mucus
- •Effective coughing techniques (huff coughing)
Complications
- •Reduced quality of life
- •Worsening symptoms over time
- •Recurrence of atelectasis
Prevention
- •Maintain a healthy lifestyle
- •See a clinician for routine check-ups
When to seek help
- •Symptoms persist beyond a few days
- •Symptoms interfere with daily activities
- •New or worsening symptoms appear
- •Concerning changes related to atelectasis
- Sudden difficulty breathing
- Bluish tint to lips or skin (cyanosis)
- Rapid heart rate
- Sharp chest pain
In any emergency, call your local emergency number or go to the nearest emergency department.
Real-world questions
- ›Can Atelectasis cause headaches?
- ›Is Atelectasis reversible?
- ›How quickly does Atelectasis progress?
- ›Is Atelectasis hereditary?
- ›Can Atelectasis be prevented?
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Frequently asked questions
Possible causes of Atelectasis include Blockage of the airway by mucus or a foreign object, Pressure from outside the lung (pleural effusion or tumor), Shallow breathing due to pain or anesthesia, Scarring of lung tissue.
Atelectasis is generally moderate, but severity can vary. Seek care if symptoms are severe or persistent.
Duration varies between individuals. Many cases improve with appropriate care, while others may persist longer and require ongoing management.
Some milder cases may improve with rest and self-care. If symptoms persist or worsen, consult a healthcare professional.
Consider seeing a clinician if symptoms are severe, persistent, worsening, or if you have any concerns related to general.
Sources
Information based on general medical references such as:
Last reviewed: May 2026