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  1. ... a collapsed lung include:</p><ul> <li>Lung diseases such as pneumonia or lung cancer</li> <li>Being on a ... gov/copd.html">COPD</a> (chronic obstructive pulmonary disease)</li> <li><a href="https://medlineplus.gov/pneumonia.html">Pneumonia</a></li> <li><a href="https:// ...