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J Dermatol. 2018 Dec;45(12):1411-1417. doi: 10.1111/1346-8138.14648. Epub 2018 Sep 17.

Alopecia areata and overt thyroid diseases: A nationwide population-based study.

Author information

1
Department of Dermatology, Eulji General Hospital, Eulji University, Seoul, Korea.
2
Division of Endocrinology and Metabolism, Department of Internal Medicine, St Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
3
Department of Dermatology, Bucheon St Mary's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
4
Department of Dermatology, St Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.

Abstract

An association between alopecia areata (AA) and other autoimmune diseases has been reported. We investigated the associations between AA and overt autoimmune thyroid diseases. A nationwide, population-based, cross-sectional study was performed using the Korea National Health Insurance claims database. We defined patients with AA as those whose records showed at least four physician contacts in which AA, alopecia totalis (AT) or alopecia universalis (AU) was the principal diagnosis. We also established an age- and sex-matched control group without AA. In a subgroup analysis, patients with AT or AU were classified into the severe AA group, and the remainder were classified into the mild to moderate AA group. Patients with AA were at an increased risk of Graves' disease (odds ratio [OR], 1.415; 95% confidence interval [CI], 1.317-1.520) and Hashimoto thyroiditis (OR, 1.157; 95% CI, 1.081-1.237), and the associations were stronger in the severe AA group (Graves' disease: OR, 1.714; 95% CI, 1.387-2.118; Hashimoto thyroiditis: OR, 1.398; 95% CI, 1.137-1.719). In conclusion, AA was significantly associated with overt autoimmune thyroid diseases. Furthermore, the risk was much higher in the severe AA group.

KEYWORDS:

Graves’ disease; Hashimoto thyroiditis; alopecia areata; autoimmune disease; autoimmune thyroid disease

PMID:
30222206
DOI:
10.1111/1346-8138.14648
[Indexed for MEDLINE]

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