Perimenopause

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

Perimenopause is the physiologic transition period during which ovarian function declines and the menstrual cycle becomes irregular, ending at confirmed menopause. It is defined by biology, not by age. Cycle lengths may lengthen or shorten, mucus patterns shift, and hormone levels fluctuate, often producing vasomotor symptoms before periods stop entirely.⁷⁸

In NaProTECHNOLOGY, the term Premenopause serves as a parallel working definition for women age 40 and older, regardless of whether perimenopause has begun. Both terms describe the same general phase of life from different angles: perimenopause is the physiologic event; premenopause is the practical clinical label. CrMS charting during this period captures real-time changes in cycle length, Peak-type mucus frequency, and post-Peak phase length, providing objective data that guides hormonal evaluation and support decisions.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.