Everything is about the menstrual cycle.

Week 44: Reproductive System: Puberty « A Primer for Women's Health.The National Institute for Women's Health topic of the week is puberty. On a similar note, informal interviews of my peers indicate that women in their 30s also go through hormonal changes, often experiencing breast discomfort, acne, and a dysphoria that makes them wonder what the hell happened in their 20s.