If you have PCOS, you may have seen a new set of letters: PMOS. It is the same condition with a new name — polyendocrine metabolic ovarian syndrome — and the change is about describing it properly, not about anything new happening in your body. This page explains what changed, why, and what stays exactly as it was.
What changed
In May 2026 an international consensus, published in The Lancet, renamed polycystic ovary syndrome as polyendocrine metabolic ovarian syndrome, shortened to PMOS. The process was led from Monash University by Professor Helena Teede, working with patient organisations and professional societies from around the world, including the international PCOS society (AE-PCOS) and Verity, the UK PCOS charity.
The NHS has already moved its page over. Its condition page is now titled polyendocrine metabolic ovarian syndrome and opens by saying that PMOS used to be called polycystic ovary syndrome (PCOS).
Why the name changed
The old name described the condition by something it does not have. As Professor Teede put it when the change was announced, there is actually no increase in abnormal cysts on the ovary.
The name also hid most of what the condition does. The Endocrine Society's announcement describes PMOS as characterised by fluctuations in hormones, with impacts on weight, metabolic and mental health, skin and the reproductive system — features that, in the announcement's words, were often unappreciated. The new name puts them in the title: "polyendocrine" for the many hormones involved, "metabolic" for the effects on the body's energy and blood sugar, "ovarian" for the part the old name did get right.
Behind that is a practical hope. The announcement says the old name reduced a complex, long-term hormonal condition to a misunderstanding about "cysts" and a focus on ovaries, and that this contributed to missed diagnoses and inadequate treatment. A name that says "metabolic" is an invitation to look at the whole body, not only the cycle.
What did not change
The condition did not change — only what it is called. The NHS page puts it simply: PMOS used to be called polycystic ovary syndrome. The international guideline your care is based on is still the 2023 one, and the new name is due to move into it at its next update in 2028.
That means:
- If you were diagnosed with PCOS, you have PMOS. You do not need a new test, a new scan or a new referral because of the name.
- Your test results mean what they meant before.
- Any medication or plan you are on is unaffected. Nothing here is a reason to start, stop or change a treatment — that conversation belongs with your doctor.
- Everything you have learned about food, movement, sleep and insulin still applies. The PCOS diet guide and the page on insulin resistance and PCOS are as true under either name.
Both names, for a while
Names change slowly in medicine. The announcement sets a three-year transition, with the new name due to be fully used in the international guideline update in 2028. Until then you will see both: some clinics, forms and websites will say PCOS, others PMOS, and many will use both side by side.
If your doctor still says PCOS, nothing is wrong and nothing has been missed. You can mention the new name if it helps the conversation, particularly if you want the metabolic side — blood sugar, cholesterol, blood pressure — looked at, but it is the same condition either way.
What it means for you
For most people, very little changes day to day. What the new name offers is a more accurate way to talk about the condition: it is not just about periods or the ovaries, and looking after it means looking at the whole body. If that framing helps you ask for a blood sugar check or explain to someone why this affects more than your cycle, it has done its job.
In the app: tracking is built for irregular cycles, and the meal plan is organised around steadier blood sugar — the metabolic side the new name puts first. None of it depends on which name your doctor uses.
Sources
- Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome — a multistep global consensus process (The Lancet, 2026; PubMed record)
- Endocrine Society — Polyendocrine Metabolic Ovarian Syndrome, the new name for PCOS
- NHS — Polyendocrine metabolic ovarian syndrome (PMOS), previously called PCOS
- Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of PCOS (Human Reproduction, full text at PMC)
This article is for education. It is not medical advice, diagnosis or treatment — talk to a clinician about your own care.
More in this series
- PCOS diet: what to eat, and why it works — What the evidence says about eating with PCOS: insulin, the pattern that helps, the foods worth limiting, and why no rigid plan is required.
- Anti-inflammatory eating for PCOS: what is real — Where "anti-inflammatory" and PCOS actually meet, which foods the evidence supports, which only marketing does, and how it overlaps with insulin advice.
- Foods to limit with PCOS, and why banning them backfires — The foods worth eating less often with PCOS, the evidence for each, and why "limit" beats "never" for a diet you can keep.
- Insulin resistance and PCOS, explained — What insulin resistance is, why it is so common in PCOS, how it is actually tested, and what food, movement, sleep and medication each do about it.
- Low-GI foods for PCOS: a practical list — What the glycaemic index does and does not tell you, which carbohydrates rank low, how protein and fat change the picture, and where GI stops helping.
- PCOS breakfast ideas that hold you until lunch — Why breakfast is where PCOS eating plans break, the protein-fibre-fat template that fixes it, ten breakfasts that use it, and what to do about coffee.
- A 7-day PCOS meal plan you can actually keep — Seven days of ordinary meals built on the pattern the evidence supports, with a shopping list and swaps, and no food group cut out.