What are menstrual irregularities? For most women, a normal menstrual cycle ranges from 21 to 35 days.1 However, 14% to 25% of women have irregular menstrual cycles, meaning the cycles are shorter or longer than normal; are heavier or lighter than normal; or are experienced with other problems, like abdominal cramps.2 Irregular cycles can be ovulatory, meaning that ovulation occurs, or anovulatory, meaning ovulation does not occur. The most common menstrual irregularities include: Amenorrhea (pronounced ey-men-uh-REE-uh) or absent menstrual periods:3, 4, 5, 6 When a woman does not get her period by age 16, or when she stops getting her period for at least 3 months and is not pregnant. Oligomenorrhea (pronounced ol-i-goh-men-uh-REE-uh) or infrequent menstrual periods: Periods that occur more than 35 days apart.4 Menorrhagia (pronounced men-uh-REY-jee-uh) or heavy menstrual periods:3, 4, 7 Also called excessive bleeding. Although anovulatory bleeding and menorrhagia are sometimes grouped together, they do not have the same cause and require different diagnostic testing.7 Prolonged menstrual bleeding: Bleeding that exceeds 8 days in duration on a regular basis.4 Dysmenorrhea (pronounced dis-men-uh-REE-uh): Painful periods that may include severe menstrual cramps.8 Additional menstrual irregularities include: Polymenorrhea (pronounced pol-ee-men-uh-REE-uh): Frequent menstrual periods occurring less than 21 days apart4 Irregular menstrual periods with a cycle-to-cycle variation of more than 20 days4 Shortened menstrual bleeding of less than 2 days in duration4 Intermenstrual bleeding: Episodes of bleeding that occur between periods, also known as spotting Best Fertility Care Centre , Maternal & amp; Child health care centre , Advanced Fertility Care Centre , Ashwini Hopsital & amp; Fertility Centre Moondrumavadi K.Pudur Madurai -07 , Low Cost IVF/ICSI Centre, Normal Vaginal Delivery Rs. 35000/- (including medicines, LSCS Rs. 50000/-(including medicines.