Many things: Cystic fibrosis is one of the main causes of bronchiectasis and in milder cases can present late in life. Tuberculosis and similar mycobacterial infections are also a cause, as is aspiration of foreign objects and severe acid reflux. In some cases, there is no known cause, although some of these, when investigated further, are found to be related to immunodeficiencies. A pulmonary doc can help.
Answered 2/4/2013
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