Key references: Definition and causes of allergic rhinitis

Australian Institute of Health and Welfare (AIHW). Allergic rhinitis (‘hay fever’). Canberra: AIHW; 2019. https://www.aihw.gov.au/reports/chronic-respiratory-conditions/allergic-rhinitis-hay-fever/contents/allergic-rhinitis
Bousquet J, Van Cauwenberge P, Khaltaev N, Aria Workshop Group, World Health Organization. Allergic rhinitis and its impact on asthma. J Allergy Clin Immunol 2001;108(5 Suppl):S147–334. https://www.ncbi.nlm.nih.gov/pubmed/11707753
Scadding GK, Kariyawasam HH, Scadding G, Mirakian R, Buckley RJ, Dixon T, et al. BSACI guideline for the diagnosis and management of allergic and non-allergic rhinitis (revised edition 2017; first edition 2007). Clin Exp Allergy 2017;47(7):856–89. https://www.ncbi.nlm.nih.gov/pubmed/30239057
Stuck BA, Hummel T. Olfaction in allergic rhinitis: a systematic review. J Allergy Clin Immunol 2015;136(6):1460–70. https://www.ncbi.nlm.nih.gov/pubmed/26409662