PMOS (PCOS)
Fatigue, weight gain, facial hair, low mood, irregular periods — polyendocrine metabolic ovarian syndrome (PMOS, until recently called PCOS) affects around 1 in 10 women, and it's about far more than fertility. Proper assessment changes what you can do about all of it.
See a GP if:
- your periods are irregular, very infrequent or have stopped
- you are struggling to get pregnant
- you have excess hair growth, acne or thinning hair that bothers you
PMOS is manageable, and treating it early also helps protect against longer-term problems such as type 2 diabetes.
What is PMOS?
Polyendocrine metabolic ovarian syndrome (PMOS) is a hormonal and metabolic condition affecting roughly 1 in 10 women. Until May 2026 it was called polycystic ovary syndrome (PCOS), and the old name misled twice: the “cysts” aren’t cysts — they’re immature egg follicles paused mid-development — and you don’t need polycystic-looking ovaries to have the syndrome. Diagnosis (the Rotterdam criteria) requires two of three features: irregular or absent ovulation; signs of higher androgen activity, either visible (acne, excess hair) or on blood tests; and polycystic-appearing ovaries on ultrasound — after excluding other causes such as thyroid disease.
Beneath the surface symptoms usually sits insulin resistance: the body needs more insulin to do the same job, and high insulin pushes the ovaries towards androgen production. That engine explains most of PMOS — and it’s the most treatable part.
Why it matters beyond fertility
PMOS is routinely framed as a fertility problem, which undersells it in both directions. Long-term, insulin resistance raises the risk of type 2 diabetes and matters for cardiovascular health; very infrequent periods leave the womb lining unshed, which needs managing in its own right. Day to day, the visible symptoms — skin, hair, weight — carry a psychological load that deserves treatment, not the “come back when you want babies” dismissal so many women report.
The counterweight: the metabolic engine responds to intervention, and even modest weight change (where weight is part of the picture) can restore ovulation and soften the whole syndrome.
How PMOS is diagnosed
A proper work-up combines your history (cycles, skin, hair, weight trajectory, family history), examination, and blood tests — androgen levels, plus screening for the mimics and companions: thyroid disease, prolactin issues, and metabolic markers for insulin resistance. Ultrasound completes the picture where needed; in younger women it’s used cautiously, since polycystic-appearing ovaries are common in the early reproductive years without any syndrome at all.
Getting formally diagnosed isn’t bureaucratic box-ticking — it anchors long-term care: what to monitor, what to protect, and which treatments make sense for your version of PMOS.
Treating PMOS — matched to your priorities
There’s no single PMOS treatment because there’s no single PMOS goal. Care is built around what matters most to you right now:
- Cycles and womb protection — hormonal options to regulate bleeding and keep the lining healthy, including the pill or a hormonal coil.
- Skin and hair — anti-androgenic approaches that genuinely help acne and excess hair, given time.
- Metabolic health — the highest-leverage target: specialist dietetic support aimed at insulin resistance, strength-based activity, and medication (such as metformin) where appropriate.
- Fertility — restoring ovulation, optimising the metabolic picture before conception, and timely referral where needed.
Priorities change across life — skin at 25, fertility at 32, metabolism at 45 — which is why continuity with one specialist beats a series of unconnected appointments.
PMOS through perimenopause and beyond
Cycles eventually stop; PMOS doesn’t entirely. The metabolic tendencies — insulin resistance, central weight gain, cardiovascular risk — persist and deserve continued attention after menopause, when they’re joined by the risks every woman faces as oestrogen falls. On the way there, perimenopause with PMOS can be confusing: already-irregular cycles make the transition harder to spot, and symptoms overlap. A specialist who understands both sides of that boundary is worth having before you reach it.
Sound familiar?
Our specialists assess and treat PMOS (PCOS) at 8 UK clinics and online.
How we treat it
- Specialist consultation A 45-minute assessment covering cycles, skin, weight, mood and fertility priorities — with a written, staged plan. About consultations
- Blood tests & diagnostics Androgen profile plus metabolic and thyroid screening — the tests that turn "probably PMOS" into an anchored diagnosis. About blood tests & diagnostics
- Specialist dietitian support Evidence-based work on the insulin-resistance engine — the highest-leverage PMOS intervention there is. About dietitian
- Cycle, skin & hormone treatment Regulating cycles, protecting the womb lining and treating androgenic symptoms — matched to your goals. About consultations
Specialists in this area
Mr Amr Moneib
Consultant Gynaecologist & Minimal Access Surgeon
MBBCh · MSc
- Endometriosis
- PMOS (PCOS)
Frequently asked questions
What is PMOS — is it the same as PCOS?
Yes — PMOS is the new name for PCOS, agreed by an international consensus published in The Lancet in May 2026 to reflect that it is a hormonal and metabolic condition, not just an ovarian one. The diagnosis and treatments are the same. It is a common hormonal condition — around 1 in 10 women — defined by two of three features: irregular or absent ovulation, higher androgen activity (acne, excess hair, or raised levels on testing), and polycystic-appearing ovaries on scan. Insulin resistance usually sits underneath, which is why treatment reaches beyond periods.
How do I know if I have PMOS?
The pattern: irregular or infrequent periods plus androgenic signs — persistent acne, facial or body hair, scalp thinning — often with stubborn central weight. Confirmation needs blood tests and sometimes a scan, and other causes ruled out. A formal diagnosis anchors years of better care, so it’s worth doing properly.
Can PMOS be cured?
No cure, but genuinely good control: metabolic treatment (diet, activity, sometimes metformin), hormonal management for cycles and skin, and targeted fertility help when wanted. Many women reach a point where PMOS stops steering their life.
Does metformin help PMOS?
For the right women, yes — it targets insulin resistance, and can improve cycles and support weight efforts, particularly where metabolic markers are abnormal. It’s not universal and not magic: it works best alongside dietary change, which is why we pair prescribing with specialist dietetic support.
Can I get pregnant with PMOS?
Most women with PMOS can — it’s a common cause of ovulation difficulty, not a verdict of infertility. Restoring ovulation (often via metabolic improvement) and timely fertility treatment where needed mean the outlook is good, and preparing metabolically before conception improves outcomes in its own right.
What's the best diet for PMOS?
The evidence supports approaches that lower the insulin load: protein-forward, higher-fibre, fewer refined carbohydrates — sustained, not crash-dieted. The pattern matters more than any named diet, and one-to-one dietetic support beats generic plans, because PMOS metabolism is personal.
Does PMOS get better after menopause?
Cycle-related symptoms end with cycles, but the metabolic tendencies persist and still deserve attention — insulin resistance and cardiovascular risk don’t retire at 51. PMOS is lifelong and shape-shifting, which is why continuity of care pays off.
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