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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 coughs last longer than 2 to 3 weeks. 2  Causes of chronic cough include. 3  water can help ease your cough-whether you drink it or add it to the air with a steamy shower or vaporizer. 4  If you have a cold or the flu, antihistamines may work better than non-prescription cough medicines.