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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.
Some coughing soundsâthe âbarkâ of croup (listen here) and the âwhoopâ of whooping cough (listen here) â are especially distinctive. Dozens of conditions can cause a cough. The most common ones I see in adults are: 1  viral upper respiratory infections.  influenza (âthe fluâ)