Nasal symptoms increase the risk of snoring and snoring increases the risk of nasal symptoms. A longitudinal population study.

"Conflict of interest The authors declare that they have no conflict of interest."

"Funding Open Access funding provided by Lund University. The RHINE study was funded by the Swedish Heart and Lung Foundation; the Swedish Association Against Asthma and Allergy; the Swedish Association against Heart and Lung Disease; the Swedish Council for Working Life and Social Research; the Bror Hjerpstedt Foundation; the Faculty of Health, Aarhus University, Denmark (Project No. 240008); the Wood Dust Foundation (Project No. 444508795); the Danish Lung Association; the Norwegian Research Council project 135773/330; the Norwegian Asthma and Allergy Association; the Icelandic Research Council; and the Estonian Science Foundation (Grant No. 4350). Vivi Schlünssen and Thorarinn Gislason are members of the COST BM1201 network."