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N.D was supported by the Canadian Asthma, Allergy, and Immunology Foundation, Sanofi Genzyme, Canada and the Canadian Lung Association-Canadian Institutes of Health Research Fellowship awards and reports payment or honoraria for lectures, presentations, manuscript writing or educational events from AstraZeneca and Sanofi-Regeneron outside the submitted work. D.B reports consultancy fees from Khure Health, payment or honoraria for lectures, presentations, manuscript writing or educational events from AstraZeneca, Glaxo Smith Kline and Sanofi\u2014Regeneron, support for attending meetings from GSK, participation on a data safety monitoring board or advisory board with GSK and Sanofi and is a participating member of the Chronic Cough Working Group. GMG reports research funding from AstraZeneca, Genentech, Third Harmonics Bio, Biohaven and Jasper paid to the institution and personal fees from AstraZeneca, Third Harmonics Bio, Allakos, Biohaven, Jasper and Blueprint. R.S received grants from AstraZeneca, Biohaven, Third Harmonics Bio and Jasper; consultancy fees from AstraZeneca and Areteia Therapeutics Inc and payment or honoraria for lectures, presentations, manuscript writing or educational events from AstraZeneca and GSK. POB reports grants from AstraZeneca, Merck, Biohaven and Jasper, consultancy fees from AstraZeneca, GSK, Sage, Teva and Affibody, payment or honoraria for lectures, presentations, manuscript writing or educational events from AstraZeneca, GSK and Covis and is a Section Editor for the European Respiratory Journal. MW, EK, WH, AO, KK, SB, CO, KH, JW, LW, KW report no conflicts of interest.","order":1,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This study represents a secondary analysis of the PROCOUGH cohort, a prospective, single-centre observational study of patients with CC conducted at McMaster University Medical Centre between December 2021 and May 2025. 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