Abstract
Graves' disease and painless thyroiditis induce hyperthyroidism and are manifestations of an immunological disorder; however, their clinical entities differ. This case report illustrates a possible interrelation between the pathogenesis of these two disorders. A 34-year-old woman presented with palpitations, fatigue, and shortness of breath and was initially diagnosed with painless thyroiditis, which spontaneously normalized within 2 months. Within the euthyroid state, there were atypical alterations in thyroid autoantibodies, namely, activation of the thyroid stimulating hormone receptor antibody and inactivation of thyroid peroxidase and thyroglobulin antibodies. Ten months later, her hyperthyroidism recurred, with this second incidence deemed to be related to Graves' disease. Our patient had two types of painless thyroiditis with no successive hyperthyroidism, followed by Graves' disease, with her clinical manifestation transitioning from painless thyroiditis to Graves' disease over a 20-month period. Future studies are needed to elucidate the mechanisms and relationship between painless thyroiditis and Graves' disease.
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