CONCLUSION
Both Graves’ hyperthyroidism and Hashimoto’s thyroiditis are thyroid autoimmune disease. In 10 to 15% of Graves’ hyperthyroidism cases, Hashimoto’s thyroiditis may occur after remission by anti-thyroid treatment. We assume that it is due to the expansion of immune response of autoantibodies that stimulate TSH receptor. Subsequently, it produces autoantibodies against TPO and TG causing lymphocytic infiltration and defect on thyroid cells; finally, hypothyroid occurs. We suggest
continuous monitoring of thyroid function in patients with Graves’ disease in spite of remission after being treated with anti-thyroid agents.