While Hashimoto's thyroiditis may be confined to the thyroid gland, autoimmune thyroiditis can be found in the presence of other autoimmune disorders.
Autoimmune endocrinopathy and polyendocrinopathy:
(1) Addison's disease
(2) hypoparathyroidism
(3) Type 1 diabetes mellitus
(4) primary ovarian or testicular failure
Autoimmune skin disorders:
(1) vitiligo
(2) alopecia areata, totalis and universalis
Autoimmune gastrointestinal disorders:
(1) autoimmune gastritis (pernicious anemia)
(2) chronic active hepatitis/autoimmune hepatitis
(3) primary biliary cirrhosis (primary biliary cholangitis)
Autoimmune disorders:
(1) SLE
(2) systemic sclerosis
(3) rheumatoid arthritis
(4) IgG4
(5) giant cell arteritis or polymyalgia rheumatica
(6) Sjogren syndrome
