TG and hyperthyroidism: Although the possible causes of liver dysfunction in hyperthyroidism have been suggested to include prolonged exposure to excessive thyroid hormones, hepatocyte anoxia, liver cell degeneration from accelerated liver glycogen and protein decomposition, autoimmune-related liver injury and congestive hepatopathy [13,14,15,16], the exact mechanisms of hyperthyroidism-related impaired liver function still remain obscure.