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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.
Causes. Productive cough can be caused due to a number of factors. Some of them include 1  -. Viral or bacterial lung infections like in the case of a common cold. 2  Read about 10 facts about seasonal cold and cough.