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Interstitial lung disease (ILD) is a group of disorders related to the scarring of the interstitium of the lungs. Interstitium refers to the tissues around air sacs (alveoli) and contains blood and lymphatic capillaries. It is also known as diffuse parenchymal lung disease (DPLD). ILD is thought to result from an exaggerated repair response to lung injuries. An excess of healing occurs, resulting in the fibrosis of the lung interstitium and thus impairment of the function of the capillaries in their exchange of gases that takes place across their walls. Patients are breathless, complain of cough, and tend to lose weight over time.