Menstrual Irregularities: Amenorrhea

  • Stephanie Corrado


In order to understand menstrual irregularities, one must be ­comfortable in understanding the menstrual cycle. The first half of the menstrual cycle from day 0–14 is termed the follicular phase. It begins with menses, which is the uterine withdrawal bleed that occurs from day 0 until day 5–7. Ovulation occurs midway through the cycle usually between days 10–14. If fertilization does not occur, the egg involutes into a corpus luteum, which produces progesterone. This occurs in the second half of the menstrual cycle and is termed the luteal phase. Normal menses occur every 21–35 days. Below is outlined the variations in follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels, and the corresponding changes in estrogen and progestin throughout the cycle (Fig. 1).


Menstrual Cycle Anorexia Nervosa Eating Disorder Congenital Adrenal Hyperplasia Turner Syndrome 
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References and Additional Readings

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Division of Adolescent and Young Adult MedicineMassGeneral Hospital for ChildrenBostonUSA

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