PMOS / PCOS (Polyendocrine Metabolic Ovarian Syndrome, formerly Polycystic Ovary Syndrome)
Polyendocrine metabolic ovarian syndrome (PMOS), formerly polycystic ovary syndrome (PCOS), is the most common hormone disorder in women of reproductive age. It affects about 10-13% of these women worldwide.1 Diagnosis requires two of the three Rotterdam criteria. The first is ovulatory dysfunction, seen as irregular or absent cycles. The second is hyperandrogenism, an excess of male-type hormones. It appears as excess hair growth (hirsutism) or acne, or as high levels on blood tests. The third is ovaries that look polycystic on ultrasound.2
Many women with PMOS / PCOS have insulin resistance. This group includes a large share of women at a normal BMI. In these women, insulin resistance drives androgen excess, stalls follicle growth, and prevents the release of an egg (anovulation).34 PMOS / PCOS varies from woman to woman. Where this metabolic problem is present, it is a driver that can change. It is not permanent.5
The International PCOS Network announced the new name in May 2026. The announcement came in a global consensus published in The Lancet.6 ASRM, the Endocrine Society, the Society for Endocrinology, and RANZCOG endorse the new name.
The old name was misleading. It implied diseased cysts on the ovary, but the "cysts" seen on ultrasound are follicles.6 The Rotterdam criteria have not changed. Both names remain in use until the 2028 international guideline update.
PMOS / PCOS is one of the most common causes of infertility related to ovulation.7 When the ovary does not release an egg on a regular basis, conception is difficult for a couple. That problem arises directly from the insulin and androgen problems at the core of the condition.8 Restoring ovulation means correcting those problems, not forcing a single ovulation.9
A common question is whether Clomid (clomiphene citrate) helps infertility in PMOS / PCOS. Clomid can make the ovary release an egg. It blocks estrogen receptors in the hypothalamus and pituitary. That action weakens the braking signal of estrogen, so more FSH and LH are released.10
Clomid can produce a cycle for some women with PMOS / PCOS.11 Clomid is a selective estrogen receptor modulator (SERM). It only pushes the ovary to release an egg. It does not correct the insulin resistance that drives PMOS / PCOS. The metabolic problem therefore continues between cycles, even when an egg is released.
NaProTechnology and restorative reproductive medicine practice approach PMOS / PCOS with one goal. The goal is to identify and correct what disrupted the cycle.9 Lifestyle and diet changes that ease insulin resistance form the foundation. For many women, even modest weight loss can help restore ovulation.5
Other tools address the body chemistry behind the condition. One is an insulin sensitizer, such as metformin or myo-inositol. Another is targeted hormone support. Cycle charting and ovulation tracking show when, and whether, an egg is released.912 Restorative care works to restore the woman's own cycle by addressing the underlying problem directly.13
Both partners need a workup. A large survey across many clinics studied couples with infertility. It found problems in both partners in 39% of cases. Ovulation disorders were the leading cause in women. Male factor therefore often appears alongside female infertility, even when the woman has ovulation problems.14 Anovulation from PMOS / PCOS should be checked alongside the semen analysis, not in isolation.15
Cited in this entry
- Polycystic Ovarian Syndrome. https://www.ncbi.nlm.nih.gov/books/NBK459251/
- Revised 2003 consensus on diagnostic criteria and long-term health risks related to polycystic ovary syndrome (PCOS). https://pubmed.ncbi.nlm.nih.gov/14688154/
- Stepto NK, Cassar S, Joham AE, Hutchison SK, Harrison CL, Goldstein RF et al. Women with polycystic ovary syndrome have intrinsic insulin resistance on euglycaemic-hyperinsulaemic clamp. Human reproduction (Oxford, England). 2013. https://pubmed.ncbi.nlm.nih.gov/23315061/
- Diamanti-Kandarakis E, Dunaif A Insulin resistance and the polycystic ovary syndrome revisited: an update on mechanisms and implications. Endocrine reviews. 2012. https://pubmed.ncbi.nlm.nih.gov/23065822/
- Lim SS, Hutchison SK, Van Ryswyk E, Norman RJ, Teede HJ, Moran LJ Lifestyle changes in women with polycystic ovary syndrome. The Cochrane database of systematic reviews. 2019. https://pubmed.ncbi.nlm.nih.gov/30921477/
- Teede HJ, Khomami MB, Morman R, Laven JSE, Joham AE, Costello MF, et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. The Lancet. 2026;407(10545):2329-2339. https://pubmed.ncbi.nlm.nih.gov/42119588/
- Balen AH Ovulation induction in the management of anovulatory polycystic ovary syndrome. Molecular and cellular endocrinology. 2013. https://pubmed.ncbi.nlm.nih.gov/23084977/
- Zeng X, Xie YJ, Liu YT, Long SL, Mo ZC Polycystic ovarian syndrome: Correlation between hyperandrogenism, insulin resistance and obesity. Clinica chimica acta; international journal of clinical chemistry. 2020. https://pubmed.ncbi.nlm.nih.gov/31733195/
- Hilgers TW. Chapter 45: Amenorrhea and Anovulation. The Medical and Surgical Practice of N. https://rrmacademy.org/library/chapter-45-amenorrhea-and-anovulation-rectbb9axo3ubo834/
- Tadesse TM Clomiphene citrate in the management of anovulation: a review of mechanisms, outcomes, and clinical challenges. Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology. 2026. https://pubmed.ncbi.nlm.nih.gov/41863134/
- Legro RS, Barnhart HX, Schlaff WD, Carr BR, Diamond MP, Carson SA et al. Clomiphene, metformin, or both for infertility in the polycystic ovary syndrome. The New England journal of medicine. 2007. https://pubmed.ncbi.nlm.nih.gov/17287476/
- Nestler JE, Jakubowicz DJ, Evans WS, Pasquali R Effects of metformin on spontaneous and clomiphene-induced ovulation in the polycystic ovary syndrome. The New England journal of medicine. 1998. https://pubmed.ncbi.nlm.nih.gov/9637806/
- Kicinska AM, et al. Successful Implementation of Menstrual Cycle Biomarkers in the Treatment of Infertility in Polycystic Ovary Syndrome-Case Report. Healthcare (Basel). 2023;11(4). https://pubmed.ncbi.nlm.nih.gov/36833150/
- Thonneau P, Marchand S, Tallec A, Ferial ML, Ducot B, Lansac J et al. Incidence and main causes of infertility in a resident population (1,850,000) of three French regions (1988-1989). Human reproduction (Oxford, England). 1991. https://pubmed.ncbi.nlm.nih.gov/1757519/
- Aschauer J, Ott J, Selzer C, Ghobrial S, Fitz V, Hager M The prevalence of abnormal semen parameters in male partners of women with anovulatory polycystic ovarian syndrome: a retrospective case-control study. Archives of gynecology and obstetrics. 2025. https://pubmed.ncbi.nlm.nih.gov/39365473/
Authoritative references
How other clinical authorities define this term. RRM Academy curates these verbatim or under fair use so the medical consensus is visible alongside our RRM-contextualized definition above.
- MeSH D011085
A complex disorder characterized by infertility, HIRSUTISM; OBESITY; and various menstrual disturbances such as OLIGOMENORRHEA; AMENORRHEA; ANOVULATION. Polycystic ovary syndrome is usually associated with bilateral enlarged ovaries studded with atretic follicles, not with cysts. The term, polycystic ovary, is misleading.
- NCI Thesaurus
A disorder that manifests as multiple cysts on the ovaries. It results in hormonal imbalances and leads to irregular and abnormal menstrual periods, excess growth of hair, acne eruptions and obesity.
- MedlinePlus
Polycystic ovary syndrome (PCOS) is the name for set of symptoms that are related to an imbalance of hormones. PCOS affects the ovaries, as well as many other parts of the body.
- Wikipedia Polyendocrine_metabolic_ovarian_syndrome
Polyendocrine metabolic ovarian syndrome (PMOS), previously called polycystic ovary syndrome (PCOS), is the most common hormonal disorder in women of reproductive age.
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.
