An association between autoimmune thyroiditis (TPO or TG‐abs) or hypothyroidism and RCBD was observed in several studies (M. S. Bauer et al., 1990; Oomen et al., 1996), and antithyroid antibodies might influence mental well‐being regardless of thyroid dysfunction (Mussig et al., 2012). Here, TPO is linked to hypothyroidism.