PCOS has a new name: PMOS
A move to rename PCOS to PMOS - does this change better reflect the complexity of this condition?
If you’ve seen that PCOS has been renamed PMOS by the European Congress of Endocrinology, you might be wondering whether we’re all expected to start using a brand-new acronym overnight. Not exactly! This isn’t a celebrity-style rebrand where everyone wakes up and suddenly has to remember a new name. Think less P. Diddy changing his stage name every two minutes and more the healthcare world choosing to transition over time to a term that describes what this condition really encompasses.
What Is PMOS?
PMOS stands for Polyendocrine Metabolic Ovarian Syndrome.
It’s the new name proposed by an international panel of experts to replace Polycystic Ovary Syndrome (PCOS), a condition that the NHS estimates affects 1 in 10 women, over a 3 year transition period.
The aim is to reflect what many women and healthcare professionals have known for years: this condition is about much more than the ovaries.
Polyendocrine - involves multiple hormone systems
Metabolic - affects insulin, blood sugar, weight regulation and cardiovascular health
Ovarian - impacts ovulation and fertility
Syndrome - a group of related symptoms
In other words, this is a whole-body endocrine and metabolic condition, not simply an ovarian disorder.
Who’s renamed it?
After many years of consultation with clinicians, researchers and women living with the condition, the proposed new terminology that’s been given an international green light was published in The Lancet today (time of writing - 12th May 2026).
(Teede HJ, Piltonen T, et al. International consensus on renaming polycystic ovary syndrome to polyendocrine metabolic ovarian syndrome (PMOS). The Lancet. Published 12 May 2026.)
Why the name PCOS could be thought of as misleading
It makes sense that the term Polycystic Ovary Syndrome has caused confusion sometimes because:
Not everyone with the condition has polycystic ovaries on an ultrasound.
The so-called ‘cysts’ in the existing PCOS name are not actually true cysts. The structures are often small, immature follicles that haven’t completed development and ovulation. However, women with PCOS can still develop genuine ovarian cysts, just like anyone else (although they can be more likely to do so).
The condition can affect more than fertility and the ovaries, although understandably that is a very real concern for those wishing to conceive (if having children is part of your life plan, it is important to say that in some cases whilst conception may potentially be more challenging, many women with PCOS (PMOS) go on to conceive and have healthy pregnancies, sometimes naturally and sometimes with support).
The old name focused on one feature that was neither universal nor accurately described.
Under the internationally used Rotterdam diagnostic criteria, a diagnosis is made when someone has two of the following three features:
Irregular or absent ovulation
Signs of excess androgens (such as acne, facial hair, elevated testosterone)
Polycystic ovarian morphology on ultrasound
That means you can meet the diagnostic criteria without any ultrasound evidence of polycystic ovaries. So you can have PCOS (PMOS), even if your ovaries look ‘normal’ on a scan.
Why this matters to women with this condition
PMOS does seem to better reflect the fact that this condition can affect:
Menstrual cycles
Fertility and ovulation
Insulin resistance
Weight regulation
Cholesterol and cardiovascular health
Acne and excess hair growth
Hair thinning
Mood and mental health
Sleep quality
Other health changes beyond reproductive age
Just because there’s a new name doesn’t mean everyone’s going to necessarily switch overnight and if you’ve been diagnosed, your condition hasn’t changed. Your symptoms, your treatment options and your lived experience are all the same.
What’s changed is the language used to describe the condition. And that could make a difference, because when a condition is named more accurately and then gets discussed a bit differently, it can become easier to understand, get diagnosed in a more timely way and all aspects of the condition may be managed better. The new name validates what’s known: it’s a lifelong endocrine and metabolic condition that deserves comprehensive care.
If there’s a gradual transition from calling it PCOS to PMOS, that can allow people to become familiar with the new term while preserving the recognition and community built around PCOS. So while most of us would probably keep saying PCOS for a while, PMOS represents a more accurate and compassionate way to describe this complex condition. That’s a change worth welcoming. It’ll be interesting to see how this progresses over the next three years.