Refers to changes in volume, regularity, or timing of menstrual periods. It can be in form of :
Menorrhagia, heavy or prolonged menstrual bleeding.
Metrorrhagia ,an increase in duration of menstrual period beyond 7 days.
Polymenorrhea, frequent menses ,each cycle shorter than 21 days. The patient might have two or more menstrual periods in one month.
Oligomenorrhea, menstrual cycle takes longer than 35 days
