Irregular menstrual bleeding can mean bleeding when you shouldn’t be or experiencing no blood at all when you would normally be during your menstrual cycle. With that in mind, you may be experiencing irregular menstrual bleeding if you notice any of the following: • An absence of any menstrual bleeding for 90 days or more, which is a secondary condition known as amenorrhea, unless the individual is breastfeeding, pregnant, or experiencing menopause • Bleeding in between menstrual cycles, after menopause, or after having sex • Bleeding or menstrual cycle that lasts longer than a week • Heavier or lighter than normal menstrual flow • Menstrual cycles that occur less than 21 days or more than 35 days apart