When the lungs turn to stone: understanding the biology of interstitial lung disease

Art · Published 3 October 2026 Swipe more like this →

In short: Interstitial lung disease is not a single condition, but a group of disorders that cause scarring in the delicate tissues surrounding your air sacs. This thickening makes it difficult for oxygen to reach your blood, transforming the lungs from flexible, breathing organs into stiff, compromised structures that struggle to function.

At the heart of interstitial lung disease (ILD) is a disruption in the body's natural repair process. Normally, the lung interstitium—the connective tissue between air sacs and blood vessels—allows for the seamless exchange of oxygen and carbon dioxide. In ILD, injury triggers an abnormal healing response, causing this tissue to become thick and stiff. This structural change creates a barrier, hindering the essential movement of gases into the bloodstream.

The causes of this scarring are diverse, ranging from environmental exposures like dust, mold, and industrial chemicals to genetic factors, autoimmune conditions, and certain medications. In many instances, however, the cause remains unknown; these cases are classified as idiopathic. Idiopathic pulmonary fibrosis, the most common type, accounts for over 30% of ILD cases. While some forms of the disease remain mild or stable, others are progressive and serious, often presenting with symptoms like shortness of breath, a dry cough, and extreme fatigue.

Diagnosis has evolved significantly, with high-resolution CT scans now often preferred over surgical lung biopsies, which carry a mortality risk of up to 1-2%. Clinicians assess patients using pulmonary function tests to measure how well the lungs transport gases. While treatments cannot reverse existing scarring, early intervention is critical to slowing further damage and managing symptoms. Because the condition is complex—with up to 15% of cases remaining unclassifiable even after biopsy—honest communication with a healthcare provider is essential for navigating the prognosis and improving quality of life.

The physical reality of lung damage is often abstract, yet it has captured the imagination of artists like Rodney McMillian. His 2008–13 work, Untitled (lungs), uses acrylic, fabric, and chicken wire to create giant, calcified forms. These sculptures mirror the biological reality of fibrosis, where surfaces appear hardened and opaque, prompting viewers to confront the fragility of their own pulsing, organic bodies.

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Related

• The silent scarring of the lungs: understanding Interstitial Lung Disease
• Why does the lung turn to stone, and why is the cause still unknown?
• Pulmonary fibrosis: When the lungs lose their ability to breathe
• The progressive scarring of the lungs that steals breath from the body
• The irreversible structural decay of the human lung's air sacs
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