Hashimoto's encephalopathy (HE) is an infrequent disease with no well-known physiopathology. Status epilepticus is rarely reported in association with HE. We describe the 7-year evolution of a young woman who presented with recurrent status epilepticus as the main complication of HE. This evolution was especially marked by the occurrence of steroid-refractory symptoms and a poor outcome with persistent cognitive and behavioral consequences. We point out that the frontal lobes are especially implicated in these symptoms. This patient highlights the risk of multiple relapses and the need for a long follow-up period. We describe her clinical and paraclinical features, compare this patient to similar case reports, and comment on her outcome.