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For adults, the most common causes of chronic cough are asthma, gastroesophageal reflux disease (GERD), and upper airway cough syndrome (related to postnasal drip), according to background information in Marchant's study.
An occasional cough is normal. But a cough that persists may signal an underlying problem. A cough is considered acute if it lasts less than three weeks; it's chronic if it lasts longer than eight weeks (four weeks in children). Some causes of coughs include: Common causes â acute. 1  Common cold. 2  Influenza (flu). 3  Inhaling an irritant. 4  Pneumonia. 5  Whooping cough.