PCOS has a new name: what PMOS means for you

If you've been diagnosed with polycystic ovary syndrome (PCOS), or you suspect you might have it, you may have seen it's just been given a new name. In May 2026, researchers, clinicians and patient groups from around the world agreed to rename the condition polyendocrine metabolic ovarian syndrome, or PMOS. It's a big shift in how the condition is described, so we wanted to explain what's changed, why, and what it actually means if you're trying to conceive.

Quick jump:

• Why change the name at all?

• So, what does PMOS actually stand for?

• Does this change your diagnosis?

• Where things stand in the UK

• What this means if you're trying to conceive

• Get in touch

Why change the name at all?

The word "polycystic" has always been a bit misleading. It suggests the ovaries are covered in cysts, but that's not quite right. What shows up on the scan are small, immature follicles that haven't developed as they should, not the kind of cysts you'd need treating or removing. Doctors and patients alike have spent years explaining this mix-up, and it's thought to have caused real problems. Some people were told they couldn't have PCOS because a scan didn't show the pattern doctors expected, even though they had every other sign of the condition. Others assumed the condition was only about their ovaries, when it also affects hormones, metabolism, skin, hair and long-term health.

This isn't a snap decision. It's the result of 14 years of work, led by Professor Helena Teede and the International Androgen Excess and PCOS Society, working alongside Verity, the UK's PCOS charity, and dozens of other patient and professional groups. Over 22,000 people, including patients, doctors and researchers, contributed their views along the way. The final name was published in The Lancet on 12 May 2026, after the wider medical community voted on it.

So, what does PMOS actually stand for?

Each part of the name was chosen carefully.

Polyendocrine reflects that several hormones are involved, not just the ones linked to the ovaries. Androgens, insulin and other hormones all play a part.

Metabolic acknowledges that insulin resistance is common in PMOS, affecting most people with the condition, including many who aren't overweight. This is closely tied to long-term risks like type 2 diabetes and heart health.

Ovarian stays in the name because ovulation and follicle development are still central to the condition. What's gone is "cystic," the word that caused so much confusion in the first place.

Does this change your diagnosis?

No. If you've already been diagnosed with PCOS, you now have PMOS. Nothing about your body has changed, and you don't need new tests or another appointment just because of the name. Doctors will still use the same diagnostic approach, known as the Rotterdam criteria, which looks for at least two of the following three things: irregular or absent periods, higher than usual androgen levels, and the follicle pattern on an ultrasound. Around 60% of people meet the criteria through their symptoms alone and never need an ovarian scan at all.

Where things stand in the UK

The Royal College of Obstetricians and Gynaecologists has welcomed the change, and the National Institute for Health and Care Excellence (NICE) is currently consulting on a new guideline built around PMOS, with a final version expected in December 2026. Verity, the UK's patient charity for the condition, has been closely involved throughout and supports the new name.

Many websites and resources were still using "PCOS" as we wrote this, so don't be surprised if you see both names for a while. Clinics, charities and health services are moving at slightly different speeds, and that's expected during a change like this. It's likely to take a few years before PMOS fully replaces PCOS in everyday use.

What this means if you're trying to conceive

Whatever it's called, the condition itself is unchanged, and so is the approach to treating it. PMOS is still one of the most common causes of fertility difficulties, largely because it affects ovulation. The renaming does put a welcome spotlight on the wider picture though: hormones, metabolism and long-term health, alongside fertility.

At Care Fertility, we've always looked at the condition this way. Our fertility tests give a full picture of your hormones and ovarian reserve, so when you sit down with your doctor for your consultation, they can talk you through your results and what they mean for your options, whether that's ovulation induction, IUI, or IVF. If insulin resistance is playing a part, we'll factor that into your treatment plan too, since managing it can make a real difference to how your body responds to stimulation medication.

Get in touch

If you have PMOS, or you're wondering whether your symptoms might point to it, we're happy to talk things through. Our enquiry team can book you in for the right fertility tests, so your results are ready to discuss when you see one of our doctors. Get in touch with Care Fertility to find out more.