甲状腺机能亢进并发重症肌无力是罕见疾病。包括本例,国内文献已有记述者仅5例。甲状腺机能亢进与重症肌无力无论在病理、症状及病程上均有一些共同之处,但在治疗上两者的相互关系则难以肯定。本文所见1例当甲状腺机能亢进时,重症肌无力明显加重,经用甲基硫氧嘧啶治疗甲状腺毒症有好转时,重症肌无力突然恶化,经加用 Hyperthyroidism complicated with myasthenia gravis is a rare disease. Including this case, the domestic literature has been described in only 5 cases. Hyperthyroidism and myasthenia gravis have some commonalities in pathology, symptoms and course of disease, but the correlation between the two is difficult to be affirmed. One case seen in this article, when hyperthyroidism, myasthenia gravis significantly increased by methylthiouracil treatment of thyrotoxicosis have improved, myasthenia gravis suddenly worsened by the use of