Medieval based fantasy

Hi I have been reading a number of the Medievil based fantasies and most of the ones that I've read feature female main characters. The authors never deal with real life situations that women in the woods might face such as sanitary issues dealing with their monthly menstrual cycle. It is as if these issues don't exist. I get the impression that the or just a female version of a man and of course man don't have issues with monthly menstrual cycles.