For many years, Polycystic Ovary Syndrome (PCOS) has been the recognised name for one of the most common hormonal conditions affecting women. It affects millions of women worldwide and is a leading cause of irregular periods, fertility problems and hormonal imbalance.
However, you may recently have come across a different term, Polyendocrine Metabolic Ovarian Syndrome (PMOS).
So, has PCOS been renamed? And what does this mean if you’ve already been diagnosed?
The short answer is that PCOS remains the recognised term used throughout the NHS and in everyday clinical practice. However, an international group of experts has recently proposed the name PMOS because they believe it better reflects what we now know about the condition.
Rather than being simply a disorder affecting the ovaries, PCOS is increasingly recognised as a complex condition involving hormones, metabolism and reproductive health.
Why is the name PCOS considered misleading?
When Polycystic Ovary Syndrome was first described, doctors believed the condition primarily affected the ovaries because many women were found to have multiple small follicles visible on ultrasound.
Over the past few decades, research has transformed our understanding of the condition.
We now know that many women diagnosed with PCOS:
- Do not always have polycystic-appearing ovaries.
- Experience problems with insulin resistance and metabolism.
- Have hormonal changes affecting several endocrine organs.
- May develop symptoms affecting their skin, weight, fertility and long-term health.
At the same time, many women who do have polycystic-appearing ovaries on an ultrasound do not necessarily have other features associated with PCOS.
This has led many specialists to question whether the current name accurately reflects the condition.
What does PMOS stand for?
The proposed name is:
Polyendocrine Metabolic Ovarian Syndrome (PMOS).
Each part of the name has been chosen to better describe how the condition affects the body.
Polyendocrine
This reflects that the condition involves several hormone-producing systems rather than just the ovaries.
Hormones that may be affected include those involved in:
- Ovulation
- Insulin regulation
- Androgen (male hormone) production
- Reproductive function
Metabolic
One of the biggest advances in understanding PCOS has been recognising its metabolic effects.
Many women have some degree of insulin resistance, increasing their risk of:
- Weight gain
- Prediabetes
- Type 2 diabetes
- High cholesterol
- Cardiovascular disease
The word “metabolic” highlights that this is much more than a reproductive condition.
Ovarian Syndrome
The ovaries remain an important part of the condition because ovulation is often disrupted.
Many women experience:
- Irregular periods
- Difficulty becoming pregnant
- Multiple small follicles visible on ultrasound
The proposed name therefore continues to acknowledge the ovarian features while recognising they are only part of the picture.
Has the diagnosis changed?
No.
If you have previously been diagnosed with PCOS, your diagnosis has not changed.
The proposed terminology reflects our growing understanding of the condition rather than a completely new disease.
The symptoms remain the same and may include:
- Irregular or absent periods
- Acne
- Excess facial or body hair
- Thinning scalp hair
- Weight gain
- Difficulty becoming pregnant
- Polycystic ovaries on ultrasound
Not every woman experiences all of these symptoms, which is why specialist assessment remains important.
Does treatment change if PMOS is adopted?
No.
Whether your condition is referred to as PCOS or PMOS, treatment is based on your individual symptoms and health goals.
Treatment may include:
Lifestyle support
Healthy eating, regular exercise and maintaining a healthy weight can improve insulin sensitivity and help regulate hormone levels.
Medication
Treatment may include:
- Hormonal contraception
- Progesterone treatments
- Medication to improve insulin sensitivity where appropriate
- Treatments for acne or excess hair growth
Fertility treatment
For women trying to conceive, treatment may include:
- Ovulation induction medication
- Fertility monitoring
- Specialist fertility treatment where required
The focus remains on personalised care rather than treating everyone in the same way.
Why is the proposed name important?
Many women have long felt that the term Polycystic Ovary Syndrome does not fully explain what they experience.
Some women never develop ovarian cysts.
Others struggle more with:
- Fatigue
- Weight management
- Insulin resistance
- Skin changes
- Mental wellbeing
The proposed name helps highlight that the condition affects the whole body rather than just the ovaries.
It may also encourage earlier recognition of metabolic health, allowing women to receive advice that could reduce their long-term risk of diabetes and cardiovascular disease.
Will the NHS start using PMOS?
At present, PCOS remains the recognised term used by the NHS and by most healthcare providers in the UK.
Medical terminology often evolves gradually as research develops. It is therefore possible that both terms may be used for some time while clinicians, professional organisations and healthcare systems consider whether the proposed terminology should become more widely adopted.
If you see either PCOS or PMOS, it is generally referring to the same underlying condition.
What should women with PCOS know?
The proposed name should not cause concern.
It does not mean your condition has changed or that your treatment needs to change.
Instead, it reflects an improved understanding that this condition affects hormones, metabolism and reproductive health together.
Whether it is called PCOS or PMOS, early diagnosis, regular follow-up and personalised treatment remain the key to managing symptoms and protecting long-term health.
Final thoughts
Medical knowledge continues to evolve, and the discussion around PMOS reflects how much we have learned about this common condition.
Although PCOS remains the recognised clinical term, the proposed name Polyendocrine Metabolic Ovarian Syndrome better reflects the fact that the condition is much more than an ovarian disorder.
For women living with PCOS, the most important message is that effective treatments are available. Whether your main concern is irregular periods, fertility, weight management or hormonal symptoms, seeking advice from an experienced gynaecologist can help you understand your options and develop a treatment plan tailored to your needs.
