Because of the obstruction of bronchus, the air can not enter into the alveoli, which causes the collapse of lung lobes or lung nodes. The causes of obstruction can be divided into internal and external causes. The common causes are foreign bodies in the trachea, sticky sputum, enlarged hilar lymph nodes and invasive pneumonia.<br>Breath is quickened, if complicate pneumonia, have fever, cough, etc.<br>
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