Irregular menstruation is a vaginal disorder whose manifestations include menstrual cycle lengths as well as metrorrage ( irregular bleeding between expected periods ) . Irregular menstruation is a vaginal disorder whose manifestations include menstrual cycle lengths as well as metrorrhagia ( irregular bleeding between expected periods ) . Irregular menstruation is a menstrual disorder whose manifestations include irregular cycle lengths as well as metrorrage ( vaginal bleeding between expected periods ) .