PCOS / PMOS myths: 10 common misconceptions debunked
No miracle promises, no judgement. Ten widespread beliefs about PCOS (now renamed PMOS) examined one by one, with official sources to support each answer.
“You must have cysts to have PCOS”
What are improperly called "cysts" are actually small ovarian follicles awaiting maturation, visible on ultrasound. Many people with PMOS do not have them at all. This is precisely why the name was changed to PMOS (Polyendocrine Metabolic Ovarian Syndrome) in May 2026 — to correct this longstanding confusion.
Source: Teede H. et al., The Lancet, 12 May 2026“PCOS only affects overweight women”
PCOS occurs at all body weights. Insulin resistance, a central mechanism of the syndrome, affects between 30 and 75% of lean women with PCOS. Reducing the syndrome to a weight problem contributes to diagnostic delays.
Source: Cassar S. et al. (meta-analysis of insulin resistance in PCOS)“If my periods are regular, I cannot have PCOS”
The Rotterdam criteria (revised 2023) require 2 out of 3 criteria: oligo/anovulation, clinical or biochemical hyperandrogenism, polycystic ovarian morphology on ultrasound or elevated AMH. A person with regular cycles but hyperandrogenism and polycystic morphology can absolutely have PCOS.
Source: International Evidence-based Guideline 2023, Monash University“PCOS always causes infertility”
PCOS is the leading cause of anovulation worldwide, and around 50% of affected women experience difficulties conceiving. However, many pregnancies occur spontaneously, and medical management (cycle regulation, ovulation induction) is effective for most.
Source: WHO — PCOS Fact sheet“The contraceptive pill cures PCOS”
The pill can regulate cycles, reduce acne, and reduce excess hair while it is taken. But it does not treat the underlying cause and has no lasting effect: symptoms return when it is stopped. It is a symptomatic treatment, not a cure.
Source: Monash Guideline 2023 — pharmacological treatment recommendations“Inositol cures PCOS”
Inositol (myo-inositol, D-chiro-inositol) may have modest effects on insulin sensitivity and cycle regularity in some patients. However, the evidence remains limited and it is not curative. It should be discussed with a doctor — never as a substitute for comprehensive management.
Source: Monash Guideline 2023 — nutritional supplements section“Losing weight is all it takes to manage PCOS”
In people with overweight, a 5–10% reduction in body weight can improve cycle regularity and fertility. But this improvement is partial, not guaranteed, and does not apply to those who are lean. PCOS is not simply a "weight condition."
Source: Monash Guideline 2023“PCOS disappears after pregnancy”
PCOS is a chronic condition. Symptoms can fluctuate over time (sometimes improving during pregnancy, sometimes persisting or evolving afterwards) but the syndrome does not disappear. Long-term metabolic monitoring remains recommended.
Source: NIH / NICHD — PCOS information“PCOS is purely a gynaecological problem”
This is exactly the misconception the renaming to PMOS — Polyendocrine Metabolic Ovarian Syndrome — was designed to address. The syndrome combines endocrine (multi-hormonal), metabolic (insulin resistance, cardiovascular risk), ovarian, and skin dimensions. Mental health is also significantly affected (3–4 times higher risk of anxiety and depression).
Source: Endocrine Society, May 2026 + The Lancet, 12 May 2026“All women with PCOS have the same symptoms”
Four main phenotypes are recognised based on different combinations of Rotterdam criteria, and the syndrome varies enormously from person to person. Some experience mainly cycle irregularities, others acne and hirsutism, others metabolic difficulties, others fertility challenges. This is what makes diagnosis and management so individual.
Source: International Evidence-based Guideline 2023What next?
Clearing up misconceptions is a first step. To go further: review your own symptoms or learn more about what the new name PMOS means.
Sources
- Teede H. et al., The Lancet, 12 May 2026 — renaming PCOS → PMOS
- Endocrine Society — official announcement on the renaming (May 2026)
- WHO — PCOS Fact sheet (prevalence, infertility, comorbidities)
- International Evidence-based Guideline 2023 (Monash, NHMRC) — PDF
- Cassar S. et al. — meta-analysis of insulin resistance in PCOS
- NIH / NICHD — PCOS information
- NHS — Polycystic ovary syndrome (PCOS)
Page written from official public sources. It does not constitute a diagnosis or a treatment recommendation. For any medical decision, consult a healthcare professional.