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It has been observed that many patients with chronic rhinitis (CR) also have bronchial hyperreactivity (BHR), suggesting a causal relationship between the two conditions. The aim of this study was to investigate the prevalence of BRH in CR and to determine the predictive factors of the association. In a prospective cross-sectional study, we included 80 patients followed for CR who had a methacholine bronchial challenge test. Forty percent of the patients had HRB. It was moderate to severe in 41% of cases and mild in 59% of cases. HRB was more common in allergic rhinitis (AR), in patients...