Society of Diabetic Nephropathy Prevention Journal of Preventive Epidemiology 2476-3934 4 2 2019 07 01 Prevalence of coexisting autoimmune disease in patients with autoimmune thyroid disease e21 e21 EN Parvin Rajabi Dehnavi https://orcid.org/0000-0002-8278-1415 Azar baradaran https://orcid.org/0000-0001-7058-6367 Alireza Zafarian https://orcid.org/0000-0002-6021-6028 Mona Namazi https://orcid.org/0000-0001-7493-6686 Shaghayegh Ferdowsian https://orcid.org/0000-0001-9790-9189 Ashraf Aminorroaya https://orcid.org/0000-0002-7550-1198 Pegah Hedayat https://orcid.org/0000-0001-5046-0388 Azar Naimi https://orcid.org/0000-0002-7717-9112 Maryam Derakhshan https://orcid.org/0000-0003-0517-2111 Mitra Heidarpour https://orcid.org/0000-0002-3332-2933 Shahnaz Eskandari https://orcid.org/0000-0001-6591-8742 Journal Article 2019 10 18 2019 12 12 Introduction: Autoimmune thyroid disease (AITD) including Hashimoto’s thyroiditis (HT) and Grave’s disease (GD) is a common immune-mediated disease. It has an association with the increased incidence of other autoimmune diseases. Objectives: The purpose of the current study was to describe the prevalence and distribution of non-thyroidal immune-mediated disease in patients with AITD. Patients and Methods: This study was a retrospective. All patients who were diagnosed with AITD in their thyroid biopsy were enrolled. The information about the coexisting disease was obtained by a trained physician using a questionnaire. The confirmed data about the disease in six systems were documented in the questionnaire Results: Of 293 AITD patients, 250 eligible cases with an average age of 48.7 years old including 23 male patients and 227 female patients were included in the study. We found 224 patients did not have a coexisting autoimmune disease. The 26 remaining patients were; 17 patients with skin disease, 3 patients with rheumatologic disease, 3 patients with endocrine disease and 2 patients with hematologic disease and none of the patients had neurologic disease. The prevalence of the disease increased with age and had no relation to gender. Conclusion: Our study showed the prevalence of non-thyroidal immune-mediated disease increased in AITD patients. Autoimmune skin disorders are the most common disease in these patients, followed by rheumatologic and endocrine diseases.