In this study there were no significant differences in thyroid hormones (FT3, FT4 and TSH) between patients and controls but hypothyroidism was detected in three patients (5 %); this is in agreement with Rhodes et al. (2009)21 who found no statistically significant differences between patients with SCA and controls in levels of thyroid hormones and Ozen et al. (2013)22 who found that hypothyroidism was detected in 3 patients (6%) in a. Here, TG is linked to hypothyroidism.