The abovementioned cases obviously suggest diagnosis of Hashimoto’s hyperthyroiditis following
Graves’ hyperthyroidism. In the first, third and fourth cases, Hashimoto’s thyroiditis has only been diagnosed after a quite long period of time since the previous diagnosis of Graves’ hyperthyroidism had been established (10, 7 and 25 years, respectively). Such conditions are similar to other studies, the diagnosis were made in 10 to 20 years of time after discontinuation of anti-thyroid drugs.