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Autoimmune diseases: Lupus and rheumatoid arthritis can both attack the lungs, causing the progressive scarring of lung tissues.Atelectasis: This is a condition that causes alveoli to collapse in certain areas of the lungs.Sarcoidosis: This is a rare condition that causes small patches of granular tissue, called granulomas, to form in the organs of the body, including the lungs.Idiopathic pulmonary fibrosis (IPF): This is a condition in which lung tissues become thick and stiff for unknown reasons.Pneumonia: The infection can also cause parenchymal inflammation (sometimes referred to as 'interstitial pneumonia').Asbestosis: This is a condition that causes scarring of the lungs due to prolonged exposure to asbestos fibers in the air.

Pulmonary edema: This is the swelling of the lungs due to the overload of fluid in tissues (sometimes referred to as 'wet lung').Interstitial lung disease (ILD): This is an umbrella term used for a large group of diseases that cause scarring (fibrosis) of the lungs.

Lung sounds in pneumonia