Endometrail hyperplasia can hit you when you just don’t know it will. If, for any reason at all, you do not have regular periods, the endometrial tissue inside the womb will just grow thicker and thicker. The doctors usually do not warn about this when they put you on some kind hormone treatment, so see here a series of forum posts about one such case of endometrial hyperplasia, which does seem to be having a happy ending, or so it seems.