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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.
1 Chronic cough is a cough that persists over time. 2  Chronic cough is not a disease in itself, but rather a symptom of an underlying condition. 3  Causes of chronic cough include: 4  smoking, 5  asthma,6  hay fever (allergic rhinitis), 7  sinus problems, 8  GERD, 9  infections, and. 10  medications. Chronic cough is a cough that persists over time. 2  Chronic cough is not a disease in itself, but rather a symptom of an underlying condition. 3  Causes of chronic cough include: 4  smoking, 5  asthma,