PCOS Is Now Called PMOS: What It Means for Your Diagnosis

You have been told you have PCOS. Or you have been searching your symptoms for months and keep landing on PCOS articles that do not quite fit. Or you have just seen a headline about PMOS, and you are not sure whether this is the same condition with a new name, something different entirely, or whether any of it changes what you should actually do.

It is the same condition. The science behind it has not changed. What has changed is that the medical community has finally acknowledged what many patients experienced for years: the old name was describing the wrong thing, and that misdescription has been quietly shaping – and limiting – the care patients received.

Here is what you need to know.

Why the old name was making things harder for patients

The term "polycystic ovary syndrome" contributed to delayed diagnosis, fragmented care, stigma, and confusion because pathological ovarian cysts are not a defining feature of the disorder.

That is not a minor semantic point. When the name of a condition implies that cysts on the ovaries are the defining feature, clinicians look at the ovaries. They run an ultrasound. If it comes back clear, patients are told they do not have the condition – even when they do. The metabolic picture goes unexamined. The hormonal complexity goes unaddressed. Patients are discharged without answers.

The condition affects an estimated 170 million women globally and remains underdiagnosed in up to 70% of affected patients. That figure is not a reflection of patients failing to seek help. It is a reflection of a name that systematically misdirected both clinicians and patients away from the full picture.

If you spent years being told your symptoms were stress, or that your test results were borderline, or that you should just lose weight and see what happens, that experience has a structural explanation. The name was pointing everyone in the wrong direction.

What Is PMOS (Polyendocrine Metabolic Ovarian Syndrome)?

PMOS is a complex, multisystem condition involving endocrine, metabolic, reproductive, dermatological and psychological health. The change from PCOS to PMOS reflects a broader understanding of the condition and its impact beyond the ovaries.

It is one of the most common hormonal conditions affecting women of reproductive age – and one of the most frequently mismanaged, precisely because the old framing reduced it to an ovarian issue.

The condition involves excess androgen production, disrupted ovulation, and significant metabolic dysfunction – particularly around insulin signalling. Insulin resistance and compensatory hyperinsulinemia are reported in the majority of affected patients. Most patients with PMOS have a metabolic component that is more significant than their ovarian symptoms. Most management plans have historically not reflected that.

What does each word in PMOS actually mean?

This is where the rename becomes genuinely useful — not as a label, but as a description of what the condition actually is.

Polyendocrine recognises that the condition is underpinned by multiple interacting hormonal disturbances — including insulin, androgens, and neuroendocrine hormones — rather than being an isolated ovarian disorder.

Metabolic acknowledges the inherent metabolic features: insulin resistance, weight dysregulation, and increased risks for type 2 diabetes and cardiovascular disease.

Ovarian retains the connection to ovarian dysfunction, including ovulatory disturbances and fertility impacts, which remain defining features of the syndrome.

This is not a condition that starts in the ovaries and happens to affect everything else. It is a multi-system hormonal and metabolic condition that happens to have significant ovarian consequences. That distinction changes which specialist is most relevant, which tests give the full picture, and which treatments address the root cause rather than its downstream effects.

Symptoms of PMOS

The symptoms of PMOS span several body systems. This is why the condition is so frequently missed or partially treated – patients are often assessed for one system at a time by different specialists, with nobody connecting the full picture.

Hormonal and reproductive symptoms

• Irregular, infrequent, or absent periods
• Difficulty ovulating or conceiving
• Excess hair growth on the face, chest, or abdomen (hirsutism)
• Thinning hair on the scalp
• Acne, particularly along the jaw, chin, and back, that persists beyond the teenage years

Metabolic symptoms

• Weight gain around the abdomen that does not respond predictably to diet and exercise
• Darkening of the skin in the folds of the neck, armpits, or groin – a visible sign of insulin resistance known as acanthosis nigricans
• Fatigue and energy fluctuations
• Difficulty losing weight despite consistent effort

Psychological symptoms

• Anxiety and depression, which occur at significantly higher rates in PMOS and are now understood as part of the condition's hormonal profile, not simply a reaction to having it

Not every patient presents with all of these. Some women have predominantly metabolic symptoms with minimal reproductive impact. Others present primarily with fertility concerns and minimal metabolic signs. The condition has several recognised phenotypes. A thorough assessment should account for all of them.

What causes PMOS?

The exact cause is not fully understood, and research is ongoing. What is clear is that PMOS is not a single-cause condition.

Genetics play a role – it runs in families. But the expression of PMOS is significantly shaped by metabolic factors, particularly insulin resistance. When the body produces excess insulin to compensate for poor insulin signalling, it stimulates the ovaries to produce more androgens. Elevated androgens then disrupt ovulation. The cycle reinforces itself.

Environmental factors – including diet, activity levels, sleep quality, and stress – influence the severity of insulin resistance and, by extension, the severity of PMOS symptoms. This is relevant not because patients are responsible for their condition, but because it means metabolic management has genuine clinical impact on symptoms, including on fertility and menstrual regularity.

Which specialist should you see for PMOS in Singapore?

This is the question most patients in Singapore have not been able to answer clearly – and the one the medical system has given the least guidance on.

PMOS falls between specialties. It is hormonal, so patients are typically referred to a gynaecologist. It is metabolic, so it also belongs partly in endocrinology. It affects fertility, so some patients only encounter a diagnosis when they cannot conceive. It affects the skin, so some first present to a dermatologist.

The right specialist depends on which features of your PMOS are most prominent.

If your primary concern is fertility or menstrual irregularity, a reproductive endocrinologist – not a general obstetrician-gynaecologist – is usually the more appropriate starting point. Reproductive endocrinologists are specifically trained in the hormonal management of conditions that affect fertility, which is closer to what PMOS actually is.

If your symptoms are predominantly metabolic – weight dysregulation, fatigue, suspected insulin resistance – an endocrinologist with experience in PMOS or metabolic hormonal conditions will be more relevant than a general O&G.

If you have been referred to a general gynaecologist and feel that your metabolic symptoms have never been properly addressed, that is not unusual. It is a structural consequence of a name that labelled this a gynaecological condition when it is not exclusively one. A second opinion, or a referral to an endocrinologist alongside your current gynaecologist, is worth considering.

Most specialists in Singapore's private system are competent. A smaller number have focused sub-specialty experience in PMOS as a metabolic hormonal condition specifically. In a condition where insulin resistance in the large majority of patients goes untreated, that difference in focus matters.

How is PMOS diagnosed?

Diagnosis is typically made using the Rotterdam Criteria, which require two of the following three features: irregular or absent ovulation; clinical or biochemical signs of excess androgens; and polycystic-appearing ovaries on ultrasound.

Note that a polycystic-appearing ultrasound is only one of three criteria – and you do not need it for a diagnosis. This is the point the old name consistently obscured.

A thorough assessment should include blood tests evaluating androgens, LH, FSH, oestradiol, thyroid function, prolactin, fasting glucose, and fasting insulin. The last two – fasting glucose and fasting insulin – are critical for assessing insulin resistance, which is present in the large majority of patients and shapes treatment decisions significantly. Many standard PCOS workups historically did not include these. If yours did not, it is worth discussing with your doctor.

A pelvic ultrasound is useful but not sufficient on its own.

How is PMOS treated?

There is no single treatment for PMOS because the condition has multiple phenotypes and the priorities vary by patient.

Management typically addresses one or more of the following goals: regulating the menstrual cycle, managing androgen-related symptoms such as acne and hair growth, improving metabolic markers including insulin sensitivity and weight, and supporting fertility where relevant.

Lifestyle interventions – specifically those that improve insulin sensitivity – have a direct impact on hormonal symptoms, including menstrual regularity and androgen levels. This is not a suggestion that patients should simply exercise more. It is a reflection of the fact that the metabolic driver of PMOS is responsive to metabolic management and that this should be part of any comprehensive treatment plan.

Medications commonly used include hormonal contraceptives (for cycle regulation and androgen management), metformin (for insulin resistance), anti-androgen medications, and ovulation induction agents for patients trying to conceive. Treatment decisions should always be made with a specialist who understands your specific presentation and goals.

Does PMOS go away?

PMOS is a long-term condition. It does not resolve on its own. However, symptoms – including menstrual irregularity, androgen-related symptoms, and metabolic markers – can improve significantly with appropriate management.

For some patients, symptoms become less pronounced after menopause, as the hormonal environment changes. However, the metabolic features of PMOS, including insulin resistance and elevated cardiovascular risk, do not disappear with menopause. Ongoing metabolic monitoring is relevant throughout life, not just during the reproductive years.