PMOS (Polyendocrine Metabolic Ovarian Syndrome) is the new official name for the condition previously known as PCOS (Polycystic Ovary Syndrome). The rename was announced on 12 May 2026 in The Lancet, after a global consensus process led by Professor Helena Teede of Monash University that involved 56 medical organisations and tens of thousands of patients and clinicians. The condition itself has not changed. The new name describes what it actually is: a whole-body hormonal and metabolic disorder that involves more than just the ovaries.

What is PMOS?

PMOS, short for Polyendocrine Metabolic Ovarian Syndrome, is a chronic disorder that affects how a woman's body regulates hormones, processes insulin, and produces eggs. It is one of the most common endocrine conditions in women, affecting about 1 in 8 women worldwide. More than 170 million women live with PMOS globally, and the World Health Organization estimates that up to 70 percent of them remain undiagnosed.

Why has PCOS been renamed to PMOS?

The old name, Polycystic Ovary Syndrome, was misleading on two counts.

First, the so-called cysts in the name are not pathological cysts. They are arrested follicles, normal egg sacs that did not release. Most women diagnosed with the condition do not have true ovarian cysts. The name caused real confusion: many patients were told they did not have PCOS simply because no cysts appeared on ultrasound, which led to missed diagnoses. In other cases the condition was overdiagnosed and overtreated.

Second, by fixing attention on the ovaries, the old name hid the wider hormonal, metabolic, dermatological, and psychological dimensions of the condition. The Lancet consensus concluded that the misnomer contributed to delayed diagnosis, fragmented care, and stigma, while also holding back research and policy attention.

What each part of the name means

The new name was chosen to encode the biology of the condition accurately.

What changes and what stays the same

The condition itself has not changed. If you were diagnosed with PCOS, you have what is now called PMOS. Your symptoms, treatment plan, and ongoing management do not need to change overnight because of the renaming. What we do need to ensure is that every aspect of the illness is covered in your care.

The new name will be fully implemented in the 2028 International Guideline update. During the three-year transition, both names may appear in medical records, research papers, and patient resources.

Over time, the rename is expected to bring:

• Earlier and broader diagnosis, as clinicians look beyond the ovaries
• More integrated care that addresses hormones, metabolism, skin, mood, and fertility together
• Greater research funding and policy attention
• Reduced stigma and clearer communication between patients and doctors
• Updates to clinical guidelines, medical curricula, and international disease classification systems

Symptoms of PMOS

PMOS does not present the same way in every woman. Symptoms vary widely in type and severity, and they can change at different stages of life. Common symptoms include:

• Irregular, missed, or unusually heavy periods
• Difficulty conceiving or unexplained infertility
• Weight gain, particularly around the abdomen
• Insulin resistance, increased hunger, or sugar cravings
• Increased acne
• Excess facial or body hair (hirsutism)
• Thinning hair on the scalp
• Darkened, velvety patches of skin in body folds (acanthosis nigricans)
• Mood changes, anxiety, or depression
• Fatigue and disturbed sleep

Many women have only a few of these symptoms. The combination, severity, and timing vary from person to person.

How PMOS is diagnosed

PMOS is diagnosed using the Rotterdam criteria, updated and reaffirmed in the 2023 International Guideline. A diagnosis in adults requires at least two of the following three features:

Other diagnostic systems are also used, including the NIH criteria and the AE-PCOS Society criteria, which differ only slightly from the Rotterdam criteria.

Your doctor will also rule out conditions that can mimic PMOS, such as thyroid disorders, raised prolactin, and congenital adrenal hyperplasia. Tests typically include a hormone profile, glucose with HbA1c, a lipid profile, and a pelvic ultrasound.

In adolescents, diagnosis is approached more cautiously, because some features such as irregular cycles can be normal in the first years after the first period.

How PMOS is treated

There is no single treatment for PMOS. Care is tailored to each woman based on her symptoms, age, fertility goals, and metabolic risk.

Lifestyle is the foundation of most treatment plans. Balanced nutrition, regular physical activity, weight management, and good-quality sleep reduce insulin resistance and improve symptoms across the spectrum.

Most women benefit from care that involves more than one specialty, coordinated across endocrinology, gynaecology, dermatology, dietetics, and mental health.

Long-term health risks linked to PMOS

PMOS is not only a reproductive concern. It carries a higher lifetime risk of several conditions:

• Type 2 diabetes mellitus
• High blood pressure and cardiovascular disease
• Fatty liver disease and its complications
• Endometrial cancer, linked to long periods without ovulation
• Obstructive sleep apnoea and obesity-related complications
• Anxiety and depression

Regular screening, including blood pressure, glucose, lipid profile, and liver function tests, helps catch these risks early. Lifestyle changes and timely medical care reduce the chance of long-term complications.

When to see a doctor

Consider consulting a doctor if you have any of the following:

• Irregular periods. What counts as irregular depends on how long it has been since your first period (menarche):
  • Within the first year: a gap of more than 90 days between periods
  • Between 1 and 3 years after periods begin: a cycle delayed beyond 45 days, or periods repeating in under 21 days
  • After 3 years: periods less than 21 days apart, or more than 35 days apart
• Difficulty conceiving after 12 months of trying, or 6 months if you are over 35
• Persistent acne that does not respond to standard skincare
• Sudden, unexplained weight gain
• Increased facial or body hair growth
• Thinning of scalp hair
• Signs of insulin resistance, such as fatigue after a heavy meal or darkening of the skin
• Mood symptoms that interfere with daily life

Early diagnosis and integrated care reduce the long-term impact of PMOS on your health.

PMOS care at Mar Sleeva Medicity Palai

At Mar Sleeva Medicity Palai, PMOS is managed as the whole-body condition it is. Our team brings together specialists across endocrinology, gynaecology, dermatology, dietetics, and mental health, so every aspect of the condition is addressed in one place.

Whether you are newly diagnosed, have managed PMOS for years, or were diagnosed with PCOS and want to understand what the rename means for your care, our team is ready to help.

Disclaimer: This article has been medically reviewed by a qualified doctor and is provided for general awareness. It is not a substitute for an individual consultation, diagnosis, or treatment. For care specific to your situation, please consult our team at Mar Sleeva Medicity Palai.