Print OverviewSelective IgA deficiency is an immune system condition in which you lack or don't have enough immunoglobulin A (IgA), a protein that fights infection (antibody). Most people with selective IgA deficiency don't have recurrent infections. However, some people who have IgA deficiency experience pneumonia, ear infections, sinus infections, allergies, asthma and diarrhea. Autoimmune diseases, in which your immune system attacks particular organs or tissues in your own body, can be found with selective IgA deficiency. Common autoimmune conditions found with IgA deficiency include rheumatoid arthritis, lupus, celiac disease or inflammatory bowel disease.Products & ServicesBook: Mayo Clinic Family Health Book, 5th EditionNewsletter: Mayo Clinic Health Letter — Digital EditionShow more products from Mayo Clinic By Mayo Clinic Staff Selective IgA deficiency care at Mayo Clinic Request an Appointment at Mayo Clinic Diagnosis & treatment April 02, 2020 Print Share on: FacebookTwitter Show references Selective IgA deficiency. Merck Manual Professional Version. https://www.merckmanuals.com/professional/immunology-allergic-disorders/immunodeficiency-disorders/selective-iga-deficiency. Accessed Feb. 14, 2020. Selective IgA deficiency. Immune Deficiency Foundation. https://primaryimmune.org/about-primary-immunodeficiencies/specific-disease-types/selective-iga-deficiency. Accessed Feb. 14, 2020. Brown AY. Allscripts EPSi. Mayo Clinic. Nov. 14, 2019. Related Products & Services Book: Mayo Clinic Family Health Book, 5th Edition Newsletter: Mayo Clinic Health Letter — Digital Edition Show more products and services from Mayo Clinic Selective IgA deficiencySymptoms & causesDiagnosis & treatmentDoctors & departmentsCare at Mayo Clinic Advertisement Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Advertising & Sponsorship Policy Opportunities Ad Choices Mayo Clinic Marketplace Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. FREE book offer – Mayo Clinic Health LetterThe Mayo Clinic Diabetes DietMayo Clinic on Digestive HealthNEW – Mayo Clinic Guide to ArthritisNew Year Special - 40% off – Mayo Clinic Diet Online CON-20256724 Patient Care & Health Information Diseases & Conditions Selective IgA deficiency