Since May 2026, polycystic ovary syndrome has had a new name. It is now called polyendocrine metabolic ovarian syndrome, or PMOS. If your GP still says PCOS, that is normal, because both names will be used side by side for three years. In my coaching, one woman in four has PCOS or endometriosis, so this change matters to a lot of the women I work with. Here is what really changes, and what does not.
A name agreed by 56 organisations
The new name was published on 12 May 2026 in The Lancet, after a global consensus led by endocrinologist Helena Teede of Monash University. According to the paper, PMOS affects about one in eight women. Fifty-six patient and professional organisations took part, and the process took fourteen years (Endocrine Society, 2026).
In the UK, the NICE guideline now in development, expected in January 2027, already carries the new name. The European Society of Human Reproduction and Embryology welcomes the change, and in France the national health research institute Inserm has updated its pages too.
Why polycystic was the wrong word
The name was misleading, and always had been. The small dark spots you see on the scan are not cysts. They are follicles, each holding an egg, that got stuck before ovulation. The authors of the consensus also showed, in a related paper, that there is no increase in abnormal ovarian cysts in this condition.
That one word did real damage. Many women are told they do not have PCOS because no cysts show up on the scan. It is a common mistake, and it delays diagnosis. Others are convinced the problem is limited to their ovaries, when in fact the whole body is involved. You can have this syndrome without a single cyst, while being slim, and sometimes even with regular periods.
What each word of the new name means
Syndrome first. A syndrome is a set of signs that go together, and no single blood test can confirm it on its own.
Metabolic next. In a large share of women with the condition, cells respond poorly to insulin. The pancreas makes more of it to get the same effect, and that excess insulin pushes the ovaries to make more androgens. It also encourages fat to build up around the organs. The syndrome raises the risk of type 2 diabetes and high cholesterol.
Ovarian, because ovulation is disrupted, with long or irregular cycles.
Polyendocrine, finally, because several hormones are affected at once. Insulin, androgens, LH rising too high compared with FSH, and AMH, the hormone made by the small follicles.
For once, the name describes what actually happens in the body. It is exactly what I go through, chapter by chapter, in my guide PCOS, everything you need to know.
The diagnosis does not change
The criteria stay the same. The Brazilian Society of Endocrinology, which represented Brazil in the consortium, said so as soon as the change was announced. Diagnosis still rests on three criteria, and two are enough. Disrupted ovulation, with cycles often longer than 35 days or fewer than nine periods a year. Excess androgens, either visible as acne, facial or body hair and thinning hair, or measured in the blood. And the look of the ovaries on a scan, which in adults can be replaced by a high AMH level in the blood.
So if you were diagnosed with PCOS, you have PMOS. There is nothing to redo. And if you were ruled out because no cysts were seen, even though your cycles are irregular and acne or hair growth bothers you, raise it again with your doctor. Two criteria out of three are enough.
A transition until 2028
The new name will be fully built into the 2028 update of the international guideline. Until then, both terms coexist. You will still see PCOS on your letters, on forums and in many clinics.
What changes for you day to day
The name changes, your body does not. But the new name puts insulin and metabolism back at the centre, and that is good news, because that is where you have the most control. Every time insulin comes down, androgens, inflammation and fat around the organs come down with it.
In practice, it starts on your plate. At least 30 g of protein at breakfast and at least 30 g at dinner, after 5 pm, every day. A savoury, protein-rich breakfast often changes the whole day, with eggs and a vegetable, Greek yoghurt and red berries, or leftover meat from the night before. Skipping breakfast to eat less tends to backfire. Blood sugar drops, hunger hits hard late in the morning, and you make up for it with something sweet.
Start your meals with the vegetables and the protein, and keep the carbohydrates for the end. The same plate, eaten in that order, raises blood sugar far less. The best time for carbohydrates is still after exercise, when your muscles take up sugar without needing much insulin.
And be wary of promises. Food does not cure this syndrome, and no supplement will rebalance your hormones. What you can do is calm a large part of the symptoms, and that work happens one meal at a time.
What I take from it
A more accurate name does not treat anyone. It does help you be taken seriously, and look for the problem where it really is, in hormones and metabolism rather than in so-called cysts. If you recognise yourself in these signs, talk to your doctor, using whichever name you like. The rest can be worked on, and your body responds faster than you think when you give it what it needs.
This article is for information only and does not replace medical advice.