Chronic autoimmune thyroiditis (Hashimoto’s thyroiditis), characterized by anti- thyroid peroxidase (TPO-Ab) and anti-thyroglobulin (Tg-Ab) antibodies in more than one-third of patients can occur, and present with either subclinical or overt hypothyroidism [47,48,51,52,53]. Here, TG is linked to Hashimoto thyroiditis.