PCOS and PMOS are the same condition. PMOS, polyendocrine metabolic ovarian syndrome, is the new name adopted in 2026. Here is what changed and what didn’t.
The short answer
There is no medical difference. PMOS (polyendocrine metabolic ovarian syndrome) is the new name for PCOS (polycystic ovary syndrome), adopted in 2026 because many people with the condition do not have ovarian cysts and the condition affects hormones and metabolism, not just the ovaries. The diagnosis, criteria and treatments stay the same.
Side by side
| PCOS (old name) | PMOS (new name) | |
|---|---|---|
| Full name | Polycystic ovary syndrome | Polyendocrine metabolic ovarian syndrome |
| Same condition? | Yes | Yes |
| Diagnosis | Two of: irregular ovulation, androgen excess, polycystic ovaries or high AMH | Unchanged |
| Emphasis | Ovaries and “cysts” | Hormones, metabolism and ovaries |
| Do I need re-diagnosis? | — | No |
| Treatment | Lifestyle, metformin, hormonal contraception, fertility care | Unchanged |
The short version
Why the name changed
The “cysts” seen on ultrasound are follicles, not true cysts, and some people with the condition have normal-looking ovaries. The old name also hid the metabolic side: higher risk of insulin resistance, type 2 diabetes and heart disease regardless of body size. Professional groups including ASRM, the Endocrine Society, ESHRE and Monash endorsed the change.
What it means for you
Your records may say PCOS for years, and both names will be used during the transition. Use the change as a prompt to ask whether your care covers metabolic health (an oral glucose tolerance test or HbA1c), cycles, skin and hair, fertility if relevant, sleep and mood.
Frequently asked questions
Is PMOS the same as PCOS?
Yes. PMOS is the new name for PCOS. The condition, diagnosis and treatment are the same.
When did PCOS change to PMOS?
The new name was announced in May 2026, with a transition period in which both names are used.
What does PMOS stand for?
Polyendocrine metabolic ovarian syndrome.
Do I need to be re-diagnosed with PMOS?
No. An existing PCOS diagnosis remains valid.
Start with the basics
The free PCOS Starter Kit explains the condition in plain language, with a cycle and symptom tracker for appointments.
