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An airway blockage also can cause atelectasis. A blockage may be due to a foreign object (such as an inhaled peanut), a mucus plug, lung cancer, or a poorly placed breathing tube from a ventilator. When a blockage occurs, the air that's already in the air sacs is absorbed into the bloodstream.
Causes of non-obstructive atelectasis: 1  Trauma: Pain resulting from injury to the chest area can make it difficult to inhale and cough.  Pleural effusion: Accumulation of fluid in the space outside the lungs but inside the chest cavity (pleural space) can press on the airways, causing collapse.