How do you know if you're in perimenopause?
Perimenopause (the menopausal transition) is the years-long shift toward menopause, and the most reliable everyday signal of where you are in it is your menstrual pattern. The estimate above follows the STRAW+10 staging framework, the standard researchers and clinicians use to describe reproductive aging [1]. Its principal marker is how your cycles are changing: still regular, becoming variable, skipping, or stopped.
Because the staging is built on menstrual bleeding, it can't apply to everyone. Hormonal birth control, pregnancy or breastfeeding, a hysterectomy, endometrial ablation, PCOS, or another condition or medication affecting your periods all change or mask the bleeding pattern, so if any of those apply, the tool says so rather than guessing.
What do the perimenopause stages mean?
- Late reproductive: cycles are still regular; you may notice only subtle changes. The transition hasn't clearly begun.
- Early menopausal transition: persistent variability in cycle length (a difference of 7 or more days from one cycle to the next that keeps recurring) is the hallmark of early perimenopause. Vasomotor symptoms like hot flushes can begin around now, and sleep changes are common through the transition [2].
- Late menopausal transition: you've begun skipping periods, going 60 days or more without one. The final period is usually within the next few years.
- Postmenopause: dated from 12 months with no period.
What your estimate is, and isn't
This is an educational estimate from a menstrual pattern, not a diagnosis and not a hormone test. Perimenopause is usually diagnosed clinically, from your history and symptoms; blood hormone levels fluctuate too much during the transition to pin down a stage on their own [1]. Two people at the same stage can feel very different.
If your periods change before age 40, that's worth raising with a clinician sooner: early changes can have other causes, including early menopause. And whatever the estimate, if symptoms are affecting your daily life, that alone is reason enough to talk to a clinician about what might help.
References
[1] Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10: addressing the unfinished agenda of staging reproductive aging. Menopause. 2012;19(4):387-95. doi:10.1097/gme.0b013e31824d8f40 https://pubmed.ncbi.nlm.nih.gov/22343510/
[2] Baker FC, Lampio L, Saaresranta T, Polo-Kantola P. Sleep and Sleep Disorders in the Menopausal Transition. Sleep Med Clin. 2018;13(3):443-456. doi:10.1016/j.jsmc.2018.04.011 https://pubmed.ncbi.nlm.nih.gov/30098758/