Polycystic Ovary Syndrome (PCOS), one of the world’s most common hormonal disorders affecting women, is now increasingly being referred to as Polyendocrine Metabolic Ovarian Syndrome (PMOS) following a global push by medical researchers and women’s health experts to better reflect the complexity of the condition.
The condition affects an estimated 10–13% of women of reproductive age globally, according to the World Health Organization, although experts believe up to 70% of women living with the condition remain undiagnosed.
While the old name “PCOS” focused mainly on ovarian cysts, specialists say the disorder involves far more than reproductive health. It is now recognised as a long-term endocrine and metabolic condition linked to infertility, obesity, insulin resistance, diabetes, cardiovascular disease, hormonal imbalance, and mental health challenges.
Researchers behind the name change said the term “PCOS” was misleading because many patients do not even develop ovarian cysts despite having the condition.
According to health experts, the new name PMOS better reflects the syndrome’s impact on multiple hormone systems and metabolic health.
What Is PMOS (Formerly PCOS)?
Polyendocrine Metabolic Ovarian Syndrome (PMOS), formerly known as Polycystic Ovary Syndrome (PCOS), is a chronic hormonal disorder that occurs when the ovaries produce excess androgens hormones usually present in small amounts in women.
This hormonal imbalance disrupts ovulation and reproductive hormone regulation, leading to irregular menstrual cycles, missed periods, infertility, acne, excessive hair growth, weight gain, and other complications.
Although the condition was traditionally associated with multiple ovarian cysts, experts stress that having cysts is not necessary for diagnosis.
According to medical research, PMOS is now viewed as a broader endocrine-metabolic disorder affecting the ovaries, insulin regulation, metabolism, fertility, and cardiovascular health.
The condition is also regarded as one of the leading causes of infertility among women worldwide.
Why The Name Changed From PCOS To PMOS
Medical researchers say the former name failed to accurately represent the full scope of the disorder.
According to experts involved in the international renaming process, the old terminology reduced the condition to ovarian cysts while overlooking its endocrine and metabolic complications.
The new name Polyendocrine Metabolic Ovarian Syndrome was adopted because it better explains that the disorder:
- Affects multiple hormone systems
- Is strongly linked to insulin resistance
- Raises obesity and diabetes risk
- Impacts fertility and ovulation
- Involves broader metabolic dysfunction beyond the ovaries
Researchers also believe the name change could improve awareness, diagnosis, patient care, and long-term medical outcomes.
Helena Teede, one of the experts leading the change, said many patients experienced delayed diagnosis and inadequate care because the condition was poorly understood.
She stated:
“It was heart-breaking to see the delayed diagnosis, limited awareness and inadequate care afforded those affected by this neglected condition.”
The transition to the PMOS name is expected to happen gradually over three years through an international implementation strategy.
What Causes PMOS?
The exact cause of PMOS is still unknown, but medical experts believe several factors contribute to the condition.
Genetics
Research shows the disorder often runs in families, suggesting a strong hereditary link.
Insulin Resistance
Many women with PMOS have insulin resistance, meaning the body struggles to properly use insulin. This can increase blood sugar levels and stimulate the ovaries to produce more androgens.
Obesity
Excess body weight can worsen hormonal imbalance and insulin resistance, increasing symptoms and complications.
Hormonal Imbalance
High levels of androgens interfere with ovulation and normal reproductive function.
Common Symptoms Of PMOS
Symptoms vary widely from person to person, and some women may have mild symptoms or none at all.
The most common symptoms include:
- Irregular menstrual cycles
- Missed periods
- Difficulty getting pregnant
- Excess facial or body hair
- Acne and oily skin
- Weight gain
- Female-pattern baldness
- Fatigue
- Darkened skin patches
- Thinning hair
- Mood changes and anxiety
Some women only discover they have the condition when seeking fertility treatment.
Can You Have PMOS Without Symptoms?
Yes. Medical experts say some women may have PMOS without obvious symptoms.
Others may experience mild symptoms that go unnoticed for years, contributing to delayed diagnosis.
This is one reason health specialists believe millions of women worldwide remain undiagnosed.
What Age Does PMOS Usually Start?
PMOS can begin any time after puberty.
However, many women are diagnosed in their 20s or 30s, particularly when trying to conceive.
The condition is more common among women with obesity or a family history of the disorder.
How PMOS Affects Fertility
One of the biggest reproductive complications linked to PMOS is irregular ovulation or complete absence of ovulation.
Without regular ovulation, becoming pregnant naturally becomes more difficult.
PMOS is considered one of the leading causes of infertility globally, though many women with the condition can still conceive with proper treatment and lifestyle management.
The Link Between PMOS, Diabetes and Heart Disease
Health experts warn that PMOS is not just a reproductive disorder.
The condition significantly increases the risk of:
- Type 2 diabetes
- High blood pressure
- High cholesterol
- Cardiovascular disease
- Stroke
- Sleep apnea
Insulin resistance is believed to be one of the key drivers behind these complications.
Mental Health and Emotional Impact of PMOS
Researchers also acknowledge the emotional and psychological toll of PMOS.
Women living with the condition may experience:
- Anxiety
- Depression
- Low self-esteem
- Body image struggles
- Emotional stress linked to infertility or physical symptoms
Experts say better awareness and earlier diagnosis could improve both physical and mental health outcomes.
How PMOS Is Diagnosed
Doctors usually diagnose PMOS using a combination of:
- Medical history review
- Menstrual history
- Hormone blood tests
- Ultrasound scans
- Evaluation of symptoms like acne, excess hair growth, or irregular periods
There is currently no single test used to diagnose the condition.
Treatment Options For PMOS
Although there is currently no cure for PMOS, treatments can effectively manage symptoms and improve quality of life.
Lifestyle Changes
Doctors often recommend:
- Weight management
- Regular exercise
- Balanced diet
- Reduced sugar intake
Even modest weight loss can improve symptoms and fertility outcomes.
Medications
Treatment may include: - Birth control pills to regulate periods
- Fertility medications
- Anti-androgen medications
- Insulin-sensitising drugs like metformin
Fertility Treatment
Women struggling with infertility may require ovulation-inducing medications or assisted reproductive treatments.
Mental Health Support
Counselling and psychological support may also help patients cope with emotional stress associated with the condition.
Can PMOS Be Prevented?
There is no guaranteed way to completely prevent PMOS because genetics likely play a role.
However, experts say certain lifestyle habits may help reduce risk or manage symptoms early:
- Maintaining a healthy weight
- Exercising regularly
- Eating a balanced diet
- Managing blood sugar levels
- Avoiding smoking
- Seeking medical attention for irregular periods or hormonal symptoms
Why Awareness About PMOS Matters
Medical experts say awareness remains one of the biggest challenges surrounding PMOS.
Because symptoms vary widely and diagnosis is often delayed, many women spend years without treatment.
Researchers hope the shift from PCOS to PMOS will encourage broader understanding of the condition as a serious hormonal and metabolic disorder not simply an ovarian issue.
The name change is also expected to improve global research, healthcare policies, diagnosis rates, and long-term patient support.
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