Occurrence of seizure during Graves' disease is very rare. According to Lin et al. (1992), only 13 cases were published between 1956 and 1992. Since then, four other cases have been published, resulting in a total of 17 papers in 40 years (Li et al. 2000, Lee et al. 1997, Radetti et al. 1993). We report, in this paper, the case of a young girl treated for recurrent Graves' disease who presented a generalized seizure.