RT Journal Article SR Electronic T1 Unexpected cause of dyspnoea in a patient with allergic rhinitis JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e244075 DO 10.1136/bcr-2021-244075 VO 14 IS 9 A1 Vesna Vukičević Lazarević A1 Ana Marija Šola A1 Ivan Vlahović YR 2021 UL http://casereports.bmj.com/content/14/9/e244075.abstract AB A defect in one part of the immune system may affect the whole system. As a result, there may be a myriad of immunological diseases, which are often masked with the one disease that has the most prominent symptoms. This case report presents a patient with long-lasting allergic rhinitis who recently developed dyspnoea in exertion with suspected asthma development. After extensive diagnostic processing, asthma was dismissed, and diagnosis of selective IgA deficiency and coeliac disease with consequential iron deficiency anaemia was established. The patient was treated with parenteral iron and a gluten-free diet, which corrected her anaemia and led to the disappearance of dyspnoea. This paper aims to show the interplay between different immunological disorders and the possible causal connection between them.