In recent years, the number of patients with allergic rhinitis AR , including Japanese cedar pollinosis JCP , has increased. Dr. Baba conducted epidemiological surveys in 1998 and 2008 to investigate the prevalence of AR in Japan, using questionnaires for otolaryngologists and their families. We carried out same questionnaire survey to investigate the changes in the prevalence of JCP, perennial allergic rhinitis PAR , and pollinosis other than JCP in 2019. The results of our survey revealed a prevalence of AR of 49.2%, and a prevalence of JCP of 38.8%. These rates represented marked increases over the previously recorded results. Furthermore, a marked increase in incidence of JCP was observed in the younger age groups.
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