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What are the most common causes of a collapsed lung?

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The most common causes of a collapsed lung include injuries to the chest, such as a puncture wound or broken ribs, according to WebMD. Damaged lung tissue caused by pneumonia, lung cancer, sarcoidosis and tuberculosis also contribute to collapsed lung, as Healthline reports.

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A collapsed lung is commonly caused by trauma that occurs on the chest, explains Healthline. Leading traumatic events associated with collapsed lungs include rib fractures, gunshot wounds, knife wounds, hard blows to the chest and endoscopic procedures.

Any penetrating or blunt object on the chest can result in a collapsed lung, according to Mayo Clinic. Some injuries occur during medical procedures, while others can occur due to physical trauma, such as car crashes.

Collapsed lungs can also result from damaged lung tissue, as Healthline reports. Damaged tissue is weaker in comparison to healthy tissue, and this weakness leads to the lung's collapse. The damage can result from a traumatic lung disease or an inflammatory condition. Damaged lung tissue can result from lung cancer, pneumonia, cystic fibrosis, pulmonary fibrosis and tuberculosis.

A collapsed lung usually results from rupturing air blisters that develop on top of the lung, notes Mayo Clinic. When the air blisters burst, they allow air to leak into the pleural space.

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