By Dr Sascha Edelstein
If you’ve recently heard that PCOS (Polycystic Ovary Syndrome) is being renamed PMOS (Polyendocrine Metabolic Ovarian Syndrome), you may be wondering what this means for your health, fertility and future treatment options.
The short answer is reassuring: the condition itself has not changed, the way it is diagnosed has not changed, and the treatments available have not changed.
What has changed is the name.
Following a global consensus process led by researchers at Monash University in Melbourne, experts have agreed that the term PCOS no longer accurately reflects the complexity of this common hormonal condition. The new name, PMOS, aims to better represent the endocrine, metabolic and reproductive features of the syndrome.
Why Is PCOS Being Renamed?
You may have seen the news: after years of work and a global consensus published in The Lancet, polycystic ovary syndrome (PCOS) has been renamed polyendocrine metabolic ovarian syndrome (PMOS). There’s a local point of pride too: the effort was led from Melbourne, out of Monash University and Professor Helena Teede’s team.
But the headline can feel more alarming than it is, so let’s start where it counts: your diagnosis hasn’t changed, your treatment hasn’t changed, and your care at Thrive hasn’t changed. What has changed is a name that was always a bit misleading.
The name was actively getting in the way of care. PCOS is one of the most common conditions affecting women, with roughly one in eight affected. Yet many who have the condition remain undiagnosed, and the name itself is part of why. PCOS frames a whole-body endocrine and metabolic condition as a narrow ovarian or gynaecological problem, which has delayed diagnosis, fragmented care, distorted research priorities, and left a lot of patients feeling unseen.
The decision to rename PCOS followed a coordinated global consensus process, with input from patients, clinicians and researchers.
What's Wrong With the Name "Polycystic Ovary Syndrome"?
Two things. First, the “cysts” don’t exist. What we see on ultrasound isn’t pathological cysts but small, arrested follicles. The name describes a finding that isn’t actually there, which confuses patients, clinicians and the public alike.
Second, even the “ovary” framing is too small. The condition is driven by interacting hormonal disturbances in insulin, androgens and neuroendocrine signalling, with metabolic, cardiovascular, reproductive, dermatological and psychological consequences.
A name pointing at one organ hides the broader multi-system impact, while the reproductive emphasis minimises many of the other important health consequences.
What Does PMOS Stand For?
Each word is doing deliberate work.
Polyendocrine captures that this is a condition involving multiple hormonal systems, not an isolated ovarian imbalance.
Metabolic puts insulin resistance, weight, type 2 diabetes risk and cardiovascular risk where they belong — at the centre of the condition.
Ovarian preserves the genuine ovarian component of the syndrome, particularly its impact on ovulation and fertility.
Importantly, dropping the word “cystic” removes the single most misleading aspect of the old name.
The acronym PMOS was also deliberately chosen to resemble PCOS, helping the change feel like an evolution of understanding rather than an entirely new disease.
Does the Name Change Affect Diagnosis?
This is one of the most common questions patients ask. The reassuring answer is no.
The diagnostic criteria remain exactly the same.
Adults are still diagnosed, after excluding other possible causes, by meeting at least two of the following three criteria:
- Irregular or absent ovulation
- Signs of elevated androgens (either clinically or on blood tests)
- Polycystic ovarian morphology on ultrasound or a raised AMH level
For adolescents, the first two criteria are still required, while ultrasound findings alone are not enough.
If you’ve already been diagnosed with PCOS, that diagnosis remains valid. The rename simply changes the label attached to the condition.
Does PMOS Change Fertility Treatment?
For patients trying to conceive, this is perhaps the most important question.
Again, the answer is reassuring.
The treatments themselves don’t change overnight. The rename is about improving understanding and awareness, not introducing new treatment protocols.
However, the emphasis it reinforces is important.
By highlighting the metabolic and endocrine aspects of the condition, the new name supports what modern fertility and women’s health guidelines already recommend: paying close attention to insulin resistance, weight management, cardiovascular health and mental wellbeing throughout life, not just during fertility treatment.
For fertility specifically, nothing about the renamed condition makes it harder to treat. PMOS remains highly manageable, and the fertility treatment pathways used to help patients ovulate and conceive remain unchanged.
The Debate Around the Name Change
Like any major change in medicine, the rename has generated discussion.
Supporters argue that the new name is more accurate, reduces confusion and stigma, and better reflects the realities of the condition. They also point to the unusually rigorous process behind the decision, which included more than 14,000 survey responses and extensive patient involvement.
Critics are not necessarily defending the old name. Instead, some established patient advocacy organisations argue that changing terminology alone will not solve the challenges patients face.
They point out that better clinician education, improved access to care, stronger research funding, insurance coverage and patient support remain essential regardless of what the condition is called. Others have suggested that splitting the condition into reproductive and metabolic subtypes may have been a better approach.
Both perspectives highlight an important point: improving outcomes for patients requires more than a name change.
I Have PCOS. Should I Be Worried?
No. Nothing about you, your body or your diagnosis has changed.
This is not a new disease. It is the same condition, with the same underlying causes and the same treatment options.
You don’t need to do anything differently.
Both terms will be used side-by-side during a planned three-year transition period, so you are likely to see references such as “PCOS (now PMOS)” for some time.
If anything, the goal of the name change is to help patients receive more complete care, earlier diagnosis and greater recognition of the condition’s broader health impacts.
Common Myths About PCOS, PMOS and Fertility
One of the biggest misconceptions is that having PCOS means you cannot have children. This simply isn't true.
PCOS is the most common cause of ovulation-related infertility, but it is also one of the most treatable. Many people conceive naturally, while others achieve pregnancy with relatively straightforward fertility support.
Other common myths include:
- That women with PCOS have cysts on their ovaries (they do not)
- That the condition only matters if you’re trying to conceive
- That it is caused solely by being overweight
- That only overweight women develop PCOS
- That the condition disappears after menopause
While reproductive symptoms may change over time, the metabolic aspects of the condition can persist throughout life and deserve ongoing attention.
How Is PMOS Diagnosed?
If you suspect you may have PMOS, the first step is to speak with your GP, fertility specialist, gynaecologist or endocrinologist.
It can be helpful to track your menstrual cycles before your appointment.
Diagnosis typically involves:
- A detailed medical history
- Physical examination
- Assessment of symptoms such as acne or excess hair growth
- Blood tests for hormone levels, including androgens and AMH
- Tests to exclude other conditions such as thyroid disorders and elevated prolactin
- A pelvic ultrasound
Two important points are worth remembering.
First, PMOS is a diagnosis of exclusion, meaning other conditions must be ruled out before a diagnosis is confirmed.
Second, a polycystic ovarian appearance on ultrasound alone is not enough to diagnose PMOS. Many women without the condition have similar ultrasound findings.
What Happens Next?
The transition from PCOS to PMOS will happen gradually over the coming years.
The new terminology will progressively appear in medical records, clinical guidelines and international disease classification systems, including future updates to World Health Organization coding and international PCOS guidelines.
For patients, however, the most important message remains unchanged.
PMOS is common, manageable and highly treatable. Early diagnosis can help you better understand your fertility, manage symptoms and reduce long-term health risks.
Concerned About PCOS or PMOS? Fertility Testing Can Help
If you have irregular periods, difficulty conceiving, symptoms of hormone imbalance, or you’ve recently been diagnosed with PCOS/PMOS, understanding your fertility is often the best next step.
At Thrive Fertility, we provide comprehensive fertility assessments and personalised advice to help you understand your reproductive health and fertility options.
Book a consultation with our team to learn more about your fertility and plan your next steps with confidence.