The common misconception about PCOS, now PMOS.
For decades, the name PCOS made a complex hormonal and metabolic condition sound like it was simply about ovarian cysts. The new name, PMOS, is meant to tell a fuller story.
For years, hearing “PCOS” often made people think of one thing: cysts on the ovaries. But that has never been the full picture.
In 2026, the condition formerly known as polycystic ovary syndrome (PCOS) was renamed polyendocrine metabolic ovarian syndrome (PMOS) following a global consensus process that took 14 years. According to the 2026 International Evidence-Based PMOS Guideline, the process involved more than 3,000 health professionals and over 100 clinical and lived-experience experts across 71 countries.
The change is not because the condition itself has suddenly become something new. Rather, the new name is intended to better reflect what research has shown about the condition and the different ways it can affect health.
And one of the biggest misconceptions it challenges is that PMOS is simply an ovarian condition.
Why PCOS needed a new name
The original name dates back to the 1930s, when the appearance of the ovaries played a much bigger role in how the condition was understood.
Today, we know that the ovarian appearance associated with the condition is not the same as having conventional ovarian cysts. The World Health Organisation (WHO) explains that some people with PCOS have polycystic ovaries visible on ultrasound, while others do not. Ovarian cysts are not required for diagnosis.
The condition can also involve reproductive hormones, metabolism and other aspects of health. The 2026 International PMOS Guideline therefore places greater emphasis on its endocrine and metabolic features alongside its ovarian and reproductive effects.
The WHO estimates that PCOS affects 10–13% of women of reproductive age globally, with up to 70% of affected women remaining undiagnosed. It also identifies longer-term health concerns associated with the condition, including insulin resistance, type 2 diabetes and obesity.
The misconceptions about PMOS we need to unlearn:
“PMOS means you have ovarian cysts.”
Ovarian cysts are not required for a diagnosis. According to the WHO, diagnosis involves at least two of three features, once other possible causes have been excluded: signs of elevated androgens, irregular or absent menstrual periods, and polycystic ovaries on ultrasound.
That means someone can have the condition without having polycystic ovaries.
“PMOS is mainly a fertility problem”.
Fertility is one part of it, but not the whole story.PMOS is a common cause of irregular ovulation and can make conception more difficult. It is also associated with metabolic concerns, including insulin resistance and an increased risk of type 2 diabetes, as well as psychological and cardiovascular health risks.
Reducing it to fertility can mean missing other important aspects of someone’s health.
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“If your periods are regular, you cannot have PMOS.”
Irregular periods are common, but PMOS does not look the same in everyone. Diagnosis considers the overall pattern of symptoms, hormone levels and reproductive function rather than relying on one symptom alone.
“Everyone with PMOS is overweight.”
Higher body weight and obesity are associated with the condition, but body size does not determine whether someone has PMOS.
A person can have PMOS at any body size. The 2026 International PMOS Guideline also emphasises that management should be individualised rather than based simply on weight.
“PMOS is caused by eating badly.”
The exact causes of PMOS are not fully understood. Genetics, hormones and metabolic factors all play a role. Lifestyle can influence some symptoms and associated health risks, but it is inaccurate to suggest that someone’s diet alone caused the condition.
“Acne or facial hair means you have PMOS.”
Acne, excess facial or body hair and scalp hair thinning can occur when androgen levels are elevated, but these symptoms can have other causes.PMOS cannot be confirmed from a single symptom or an online checklist.
What PMOS helps us understand
The new name reflects a broader understanding of the condition. “Polyendocrine” points to its hormonal and endocrine features, while “metabolic” acknowledges its relationship with metabolism and associated health risks. “Ovarian” recognises its effects on ovulation and reproductive health.
In other words, PMOS is not simply about what appears on an ultrasound. It can affect different aspects of a person’s health and may present differently from one person to another. This broader understanding is one of the reasons behind the terminology change outlined in the 2026 International PMOS Guideline.
What changes with the new name?
The name may have changed, but the condition has not suddenly become something new. If you have been diagnosed with PCOS, you still have the same condition; it is now being referred to as PMOS.
The 2026 International PMOS Guideline states that the recommendations and content of the existing guideline remain unchanged following the terminology update. The next full International Guideline, due in 2028, will incorporate PMOS as the standard terminology.
What is really changing is how we talk about the condition. For years, the name PCOS made people think mainly about the ovaries and cysts. PMOS is an attempt to show that there is more to the condition than what appears on an ultrasound.
