The prevalence rate of allergic rhinitis and the consultation rate caused by this disease were studied in 131 general practices covering a population of 450,000 persons in Denmark. During a 1-yr period all consultations with or without symptoms were recorded. Allergic rhinitis was defined as paraoxysmal sneezing and rhinorrhea with or without conjunctivitis, and without signs of infection. Results are presented from 3 groups of practices classified by self-estimated completeness of reporting. Of the total population 11-15/1000 contacted a practice during the 1-yr period (males: 12-17.permill., females: 10-13.permill.). The highest prevalence rate occurred at 10-19 yr of age, and allergic rhinitis was common from 5-44 yr of age. The prevalence rate was higher among males up to the age of 30, after which age it was a little higher among females. About 2/3 of the patients consulting had at least 1 consultation/yr with symptoms present. The number of contacts came to 4.4 per patient per year and 20-25% of these were with symptoms.