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POI Is Not Rare. It Is Under-Recognized.

Why Primary Ovarian Insufficiency deserves the same attention we now give PCOS - and why every woman, every clinician, and every health system needs to take it seriously.

By Dr. Vaishali Popat, MD, MPH - Vital Endocrinology

Most women have heard Polycystic ovary syndrome (PCOS) or Polyendocrine Metabolic Ovarian Syndrome (PMOS)is openly discussed in clinics, women's magazines, and on social media as the metabolic, hormonal, whole-body syndrome it really is. Far fewer women have heard of POI. Primary Ovarian Insufficiency is just as much a whole-body endocrine condition - and in many ways just as serious - yet patients routinely describe being dismissed, misdiagnosed, or told nothing can be done.

After more than two decades caring for women with POI - including my fellowship years at the NIH studying and researching this condition - I can tell you the same thing my patients tell me: most doctors do not know much about POI. That has to change.

What POI actually is

Primary Ovarian Insufficiency is the loss of normal ovarian function before age 40. The ovaries stop releasing eggs reliably, estrogen and progesterone production drops, so FSH and LH levels rise.1 POI is not the same as early menopause. In menopause the ovaries are quiet for good. In POI, ovarian function can flicker on and off - which is why a small percentage of women with POI still ovulate spontaneously and roughly 5-10% conceive spontaneously.1,2

Estrogen is a signaling molecule the woman's entire body depends on. When it disappears decades earlier than nature intended, every system that has receptors for estrogen is affected - bones, blood vessels, brain, skin, mood, sleep, sexual tissues, even thyroid and adrenal function.

POI is not just an ovary problem. It is a whole-body endocrine condition that starts in the ovaries.

The prevalence has changed

For decades the textbooks said POI affects 1 in 100 women under 40.3 That number is now considered an underestimate. The most-cited modern meta-analysis, by Golezar and colleagues, pooled data from 31 international studies and put the global prevalence of POI at 3.7% (95% CI 3.1-4.3) - nearly four times what we used to teach.4 A subsequent 2023 meta-analysis confirmed a similarly elevated global prevalence.5

Population studies in younger women show the same direction. A nationwide Israeli study in women under 21 found that the annual incidence of new POI diagnoses more than doubled between 2000-2008 and 2009-2016 (2.0 vs. 4.5 per 100,000 person-years).6 A separate Finnish study reported a parallel rise in adolescents aged 15-19 from 2007 to 2017.1

Why the shift? Better awareness, more sensitive hormone testing, more women undergoing fertility evaluation in their thirties, and - almost certainly - real biological changes we do not yet fully understand. At the same time, global fertility rates are declining and women are starting families later. A condition that quietly steals reproductive years from women in their 20s and 30s should no longer be a footnote. It is a public health issue.

References

  1. 1. Franca MM, Mendonca BB. Primary ovarian insufficiency: update on clinical and genetic findings. Frontiers in Endocrinology. 2024;15:1464803. doi:10.3389/fendo.2024.1464803. View source
  2. 2. Nelson LM. Primary ovarian insufficiency. New England Journal of Medicine. 2009;360(6):606-614. doi:10.1056/NEJMcp0808697. View source
  3. 3. Coulam CB, Adamson SC, Annegers JF. Incidence of premature ovarian failure. Obstetrics & Gynecology. 1986;67(4):604-606. View source
  4. 4. Golezar S, Ramezani Tehrani F, Khazaei S, Ebadi A, Keshavarz Z. The global prevalence of primary ovarian insufficiency and early menopause: a meta-analysis. Climacteric. 2019;22(4):403-411. doi:10.1080/13697137.2019.1574738. View source
  5. 5. Li M, Zhu Y, Wei J, et al. The global prevalence of premature ovarian insufficiency: a systematic review and meta-analysis. Climacteric. 2023;26(2):95-102. doi:10.1080/13697137.2022.2153033. View source
  6. 6. Lass-Hennemann J, et al. Primary ovarian insufficiency: nationwide incidence rate and etiology among Israeli adolescents. Journal of Adolescent Health. 2020;66(5):603-609. View source