The types of chemotherapy I had are not supposed to cause Tinnitus. From what I've read, there are other types that do cause it, and it is because the chemo gets in to the bloodstream and then in to the fluid that the stereocilia in the cochlea are "bathed in." This permanently damages the stereocilia (inner ear hairs). I'm not blaming my doctors for anything: the chemo saved my life, at least for now. But I know of other Mayo patients who had the same thing occur, although I do not know specifically what types of chemo they were given.