As of 2026, the condition long known as PCOS, polycystic ovary syndrome, has a new official name: PMOS, Polyendocrine Metabolic Ovarian Syndrome. The change was announced through a global consensus process and published in The Lancet.1 If you have a PCOS diagnosis, the most important thing to know is this: nothing about your body, your diagnosis, or your treatment has changed. Only the name has.
I am writing this because the news has reached patients faster than it has reached most clinics, and a name change to a condition you have lived with for years can feel unsettling. It should not. The new name is an upgrade in accuracy, and understanding why it changed actually tells you something useful about the condition itself.
What does PMOS stand for?
PMOS stands for Polyendocrine Metabolic Ovarian Syndrome. Each word does a job that the old name did not:
- Polyendocrine means more than one hormone system is involved. The condition affects insulin, androgens, and the ovarian hormones together, not in isolation.
- Metabolic puts insulin resistance and metabolism where they belong, at the centre of the picture, rather than treating them as a side issue.
- Ovarian keeps the link to the ovaries, because ovulation and fertility are still central to how the condition is experienced.
Put together, the name describes a whole-body hormonal and metabolic condition that happens to show up strongly in the ovaries, which is much closer to the truth than "cysts on the ovaries."
Why was PCOS renamed?
The old name was wrong in two specific ways, and both caused real confusion.
First, the "polycystic" part is a misnomer. The structures seen on a PCOS ultrasound are not cysts. They are small follicles, each holding an immature egg, that have stalled rather than maturing and releasing.2 Many people spent years frightened that their ovaries were full of cysts that needed removing, which was never the case.
Second, calling it an "ovary syndrome" framed it as a gynaecological problem. In reality the condition is multisystem. It touches metabolism and insulin, skin and hair, mood and mental health, and long-term risks like type 2 diabetes, alongside the reproductive features.1 A name that pointed only at the ovaries pushed care toward fertility clinics and away from the metabolic and whole-body care that many people also need.
Who decided this, and when?
This was not one group renaming a condition on a whim. It was a structured, decade-long international effort, led by Professor Helena Teede at Monash University in Australia, culminating in a multistep global consensus published in The Lancet in 2026 and presented at the European Congress of Endocrinology in Prague.1
The process surveyed close to 15,000 people in 2025, including patients, advocates, and clinicians from around the world. Around 86 percent of patients and 71 percent of health professionals supported moving to a new, biologically accurate name rather than keeping the PCOS acronym.1 In other words, the people who live with the condition asked for this.
Does the name change affect my diagnosis or treatment?
No, and this is worth saying plainly. The diagnostic framework, the Rotterdam criteria, is unchanged. If you meet the criteria for PCOS, you meet the criteria for PMOS. You can read exactly how that diagnosis is made in how PCOS is diagnosed by the Rotterdam criteria.
Your treatment is unchanged too. Ovulation induction with letrozole, metformin where it helps, and the lifestyle and metabolic work that sits underneath all of it, none of that shifts because of a new label. If anything, the new name supports the more complete, whole-body care that good clinicians were already trying to give.
When will doctors and clinics start using PMOS?
Slowly, and not all at once. A name this established does not change overnight. The expectation is a transition of about three years, with PMOS being written into the International Classification of Diseases (ICD) around 2028.3 During that window you will see both names in use: on lab reports, in clinic letters, in apps, and in search results. Both refer to the same condition, so seeing "PCOS" in one place and "PMOS" in another is normal and not a contradiction.
Why this site still says PCOS
You will notice that most of our library still uses "PCOS," and that is deliberate. PCOS is the term you almost certainly know, and it is the term you type into a search bar when you are looking for answers at midnight. We use it so you can find the information you need. Alongside it, we tell you the new clinical name, PMOS, so you are never caught out when your clinician uses it. Both worlds, one condition.
As PMOS becomes the everyday term over the next few years, the balance on this site will shift with it. For now, meeting you where you are matters more than being first to drop a name everyone still uses.
What this means for you
If you take one thing from this: a clearer name does not change your reality, but it can change the care you are offered. "Polyendocrine Metabolic Ovarian Syndrome" tells every clinician who reads it that this is a hormonal and metabolic condition, not just an ovary problem, which is exactly the framing that leads to better long-term care. Your diagnosis is the same. Your plan is the same. The name is just finally honest about what you have been managing all along.
What's next
- How PCOS is diagnosed: the Rotterdam criteria
- The four PCOS types: insulin, inflammatory, adrenal, and post-pill
- The full PCOS blood test panel
- Letrozole for PCOS, the first-line option
Sources
- Teede HJ, et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. The Lancet 2026. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(26)00717-8/fulltext
- Endocrine Society. Polyendocrine Metabolic Ovarian Syndrome: new name to improve diagnosis and care of a condition affecting 170 million women worldwide. 2026. https://www.endocrine.org/news-and-advocacy/news-room/2026/pcos-name-change
- Society for Endocrinology. Polyendocrine Metabolic Ovarian Syndrome (PMOS) is the new name for PCOS. 2026. https://www.endocrinology.org/news/item/23445/polyendocrine-metabolic-ovarian-syndrome-(pmos)-is-the-new-name-for-pcos
Common questions
What does PMOS stand for?
PMOS stands for Polyendocrine Metabolic Ovarian Syndrome. It is the new clinical name for PCOS, adopted in 2026. The name reflects that the condition involves several hormone systems and metabolism, not only the ovaries.
Is PCOS the same thing as PMOS?
Yes. PMOS is simply the new name for the same condition. If you were diagnosed with PCOS, you have what is now called PMOS. Nothing about your body or your diagnosis changed, only the label.
Does the new name change my diagnosis or treatment?
No. The Rotterdam criteria used to diagnose the condition are unchanged, and so is your treatment. Letrozole, metformin, lifestyle support, and everything else work exactly as before. Only the name is different.
When will doctors and clinics start using PMOS?
Gradually. The change is expected to take about three years to settle in, with PMOS entering the international disease classification (ICD) around 2028. Expect to see PCOS and PMOS used side by side during the transition.