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The existent data in the international speciality literature revealed a significantly high prevalence of thyroid disorders, mainly of those autoimmune, in patients with pulmonary arterial hypertension (PAH), and, conversely, an high prevalence of PAH in patients with hyperthyroidism or Hashimoto autoimmune thyroiditis with euthyroidism. The studies carried out until the present did not identify the pathogenetic mechanism of the occurrence of PAH in patients with thyroid disorders. The prompt normalization of PAH appeared in context of the hyperthyroidism, after adequate treatment of the hyperthyroidism and after obtaining euthyroidism, has been proven after many clinical trials. There are limited data in the speciality literature about comparative assessment of the effectiveness of the different therapeutic methods of hyperthyroidism (the treatment with antithyroid drugs, surgical treatment and radioactive iodine treatment) in reduction of pulmonary pressure.