Graves disease in children typically presents with suppressed thyroid-stimulating hormone (TSH) and elevated free thyroxine (FT4) and triiodothyronine (FT3). Isolated raised FT3 is not commonly quoted as an early feature of evolving Graves disease. Graves disease is known to be associated with myasthenia gravis. There is, however, little literature on the temporal relationship between the onset of the two diseases....