Irregular cycles can be ovulatory, meaning that ovulation occurs, or anovulatory, meaning ovulation does not occur. The most common menstrual irregularities include: Oligomenorrhea or infrequent menstrual periods: Periods that occur more than 35 days apart. For most women, a normal menstrual cycle ranges from 21 to 35 days. 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. Irregular cycles can be ovulatory, meaning that ovulation occurs, or anovulatory, meaning ovulation does not occur. Menstrual cycle irregularities can have many different causes, including: Pregnancy or breast-feeding. Eating disorders, extreme weight loss or excessive exercising, Polycystic ovary syndrome (PCOS), Premature ovarian failure, Pelvic inflammatory disease (PID), Uterine fibroids.
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Women's Health and Complications 