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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.
Other causes â A number of other conditions can lead to chronic cough. These include: Respiratory tract infection â An upper respiratory infection such as a cold can cause a cough that lasts more than eight weeks.