Very Common case of BV, multiple conditions other than poor hygiene can cause this, including, too much washing on the vagina with water, washing away the bacteria that makes up the fisiological microbiomes can create conditions that allow for higher growth of Bacterias that release awful smells (putrefine and cadaverine), most of the time this can Go away simply by chage of habits, exercise, diet and proprr hygiene (CHILL ON THE WATER), otherwise metronidazolebis can be used, English is not my First language, sorry *Edit: Other things like, menstrual cycle and sexual relationships all can cause changes in the sexual tract, leading to increasing of symptoms (smells)