Serial changes in liver function tests in patients with thyrotoxicosis induced by Graves' disease and painless thyroiditis.
http://www.ncbi.nlm.nih.gov/pubmed/18001177
CONCLUSION:
Similar serial changes in liver function tests in both Graves' disease and painless thyroiditis strongly suggest that increases of AST and ALT after starting ATD therapy may not be due to ATD side effects but may be induced by changes in thyroid function.