If you have ever been told you have PCOS, there has been an important change.

In May 2026, Polycystic Ovary Syndrome (PCOS) was officially renamed Polyendocrine Metabolic Ovarian Syndrome (PMOS).

The new name is more than a change in wording.

It reflects something physicians and patients have understood for years:

This condition is not simply about ovarian cysts.

PMOS can affect:

• Menstrual cycles
• Ovulation
• Hormones
• Metabolism
• Insulin response
• Skin and hair
• Weight
• Fertility
• Pregnancy
• Long-term health

The international group that developed the new name concluded that the old term was misleading because it focused too much on the ovaries and suggested that women needed to have ovarian “cysts” to have the condition. They do not.

At Women’s Health Group Chicago, Dr. Michael Awad takes a whole-person approach to PMOS.

We do not start with:

“You have cysts, so you have PCOS.”

And we do not stop with:

“Your periods are irregular, so take this medication.”

Instead, we try to understand how the pieces fit together.

What are your symptoms?

Are you ovulating?

Are there signs of excess androgen activity?

Is there a metabolic component?

Is your uterine lining being protected?

Are you trying to become pregnant?

Is weight a concern—or is it not a concern at all?

What other conditions could explain your symptoms?

And most importantly:

What are you trying to accomplish with treatment?

Because PMOS exists across a wide range of presentations, and the right treatment for one patient may be completely different from the right treatment for another.

Why Did PCOS Change Its Name to PMOS?

For decades, the condition was called Polycystic Ovary Syndrome, or PCOS.

There were several problems with that name.

First, the structures seen on the ovaries in PMOS are generally small follicles, not pathologic ovarian cysts.

Second, a woman does not need polycystic-appearing ovaries to have the condition.

Third, the name focused attention on the ovaries when PMOS can involve several systems throughout the body.

In 2026, a large international consensus process involving 56 professional and patient organizations selected the new name:

Polyendocrine Metabolic Ovarian Syndrome — PMOS

The words were chosen intentionally.

Polyendocrine

The condition can involve several interacting hormonal systems, including androgen production, ovarian function, and metabolic hormonal pathways.

Metabolic

For many patients, insulin resistance, glucose regulation, cholesterol, weight, and other metabolic factors are important parts of the condition.

Ovarian

Ovulation and ovarian function remain central features of the syndrome.

Syndrome

PMOS is not one single abnormality. It is a collection of features that can appear differently from one patient to another.

The new name removes the misleading focus on “cysts” and better reflects the broader endocrine, metabolic, and reproductive nature of the condition.

Why Are We Still Using the Term PCOS?

You will probably continue to see both PCOS and PMOS for some time.

That is expected.

The name change occurred in May 2026, and medical records, insurance systems, coding systems, websites, textbooks, and patient education materials will take time to catch up.

Medical organizations have recommended a gradual transition using both terms so patients are not confused and existing medical information remains easy to find.

For that reason, throughout this article we may refer to:

PMOS, formerly known as PCOS.

PMOS Is a Spectrum, Not One Standard Patient

One of the most important things to understand about PMOS is that it does not look the same in everyone.

One patient may have:

• Very irregular periods
• Significant unwanted facial hair
• Normal body weight
• Normal-appearing ovaries

Another may have:

• Relatively regular periods
• Elevated androgen levels
• Insulin resistance
• Difficulty becoming pregnant

Another may have:

• Irregular ovulation
• Acne
• Weight concerns
• Polycystic ovarian morphology on ultrasound

And another may have only a few features that develop gradually over several years.

International guidelines recognize different combinations of ovulatory dysfunction, androgen excess, and ovarian morphology.

That variation is why PMOS is better understood as a syndrome with different clinical presentations, rather than one disease that looks exactly the same in every patient.

PMOS Can Be Both Overdiagnosed and Missed

This condition has an unusual problem.

Some women are told they have PCOS too quickly.

Others live with symptoms for years before receiving an appropriate diagnosis.

Both can happen.

Why PMOS Can Be Overdiagnosed

A patient might have an ultrasound showing many ovarian follicles and be told:

“You have PCOS.”

That is not enough by itself.

Polycystic ovarian morphology can occur without PMOS.

Likewise, having irregular periods alone does not automatically establish the diagnosis.

Acne alone does not establish the diagnosis.

Weight gain alone does not establish the diagnosis.

And a high AMH level alone should not simply be interpreted as proof of PMOS.

Current international diagnostic criteria require a combination of specific clinical features after other possible causes have been considered.

Why PMOS Can Also Be Missed

The opposite problem also occurs.

A woman may be told:

“Your ultrasound is normal, so you don’t have PCOS.”

That can also be incorrect.

If an adult patient has both irregular ovulation and clinical or biochemical evidence of increased androgen activity, current international guidelines state that ovarian ultrasound is not required to make the diagnosis after appropriate exclusion of other causes.

This is one reason the name PCOS created confusion.

You can have the syndrome without having polycystic-appearing ovaries.

How Is PMOS Diagnosed?

There is no single blood test, ultrasound, symptom, or computer algorithm that diagnoses PMOS.

For adults, current international criteria generally require two of three features, after other possible causes have been excluded:

1. Clinical or biochemical hyperandrogenism
2. Ovulatory dysfunction
3. Polycystic ovarian morphology on ultrasound or, in appropriate adults, AMH as an alternative to ultrasound

If both irregular menstrual cycles and hyperandrogenism are clearly present, ultrasound or AMH may not be necessary to establish the diagnosis.

That sounds simple on paper.

In real life, it may not be.

Why Diagnosing PMOS Sometimes Takes Time

PMOS is not always a one-visit diagnosis.

Sometimes the answer is clear quickly.

Sometimes it takes time to understand the pattern.

A patient may already be taking birth-control pills that alter her hormone levels.

She may have recently gained or lost weight.

Her cycles may have changed only recently.

She may have had an ultrasound years ago but no current imaging.

Symptoms may overlap with thyroid disease, elevated prolactin, adrenal conditions, hypothalamic dysfunction, medication effects, or other endocrine disorders.

Hormone testing also has technical limitations. International guidelines recommend high-quality laboratory methods for androgen measurement because inaccurate assays can make interpretation difficult.

Sometimes responsible medicine means saying:

“We need more information before putting a permanent label on this.”

What Conditions Can Look Like PMOS?

Part of diagnosing PMOS is making sure another condition does not better explain the symptoms.

Depending on the patient, evaluation may consider conditions involving:

• Thyroid function
• Prolactin
• Adrenal hormones
• Other causes of androgen excess
• Pregnancy
• Hypothalamic or pituitary dysfunction
• Medication effects
• Other endocrine disorders

The exact evaluation depends on the patient’s symptoms and history.

PMOS is therefore not simply diagnosed by checking boxes.

The physician has to make sure the boxes belong to the same condition.

What Are Common Symptoms of PMOS?

PMOS can affect several parts of the body.

Common features include:

• Irregular periods
• Missing periods
• Irregular ovulation
• Difficulty becoming pregnant
• Acne
• Increased facial or body hair
• Thinning scalp hair
• Metabolic abnormalities
• Insulin resistance
• Weight gain or difficulty managing weight in some patients

But you do not need every symptom to have PMOS.

And not every woman with PMOS has a weight problem.

Irregular or Missing Periods

One of the most common features of PMOS is irregular ovulation.

You may notice:

• Long menstrual cycles
• Skipped periods
• Several months without a period
• Very unpredictable cycles
• Cycles that change significantly from month to month

Irregular bleeding matters for more than convenience.

When ovulation does not occur regularly, the uterine lining may be exposed to prolonged estrogen without enough progesterone.

Over time, prolonged untreated irregular cycles can increase the risk of endometrial hyperplasia and endometrial cancer, although the absolute cancer risk for an individual patient remains low.

Protecting the uterine lining can therefore be an important part of PMOS treatment even when pregnancy is not currently a goal.

Acne, Facial Hair, and Hair Thinning

PMOS may involve increased androgen production or increased androgen effects.

That can contribute to:

• Persistent acne
• Facial hair
• Increased body hair
• Thinning hair on the scalp

These are not simply cosmetic concerns.

They may provide useful information about what is happening hormonally.

Current diagnostic guidelines evaluate both clinical signs of androgen excess and laboratory evidence of hyperandrogenism when appropriate.

PMOS, Insulin Resistance, and Metabolic Health

The word “metabolic” was added to the new name for a reason.

Insulin resistance plays an important role in PMOS for many patients.

PMOS is also associated with increased risks involving:

• Abnormal glucose regulation
• Type 2 diabetes
• Cholesterol abnormalities
• Cardiovascular risk factors
• Sleep apnea
• Other metabolic health concerns

Current international guidelines recommend considering PMOS as a condition requiring attention to reproductive and metabolic health across a woman’s lifespan.

But there is another important distinction:

Not every patient with PMOS has the same metabolic abnormalities.

A thin patient can have PMOS.

A patient without insulin resistance can meet diagnostic criteria.

And weight alone should never be used to diagnose or dismiss the condition.

You Cannot Diagnose PMOS by Looking at Someone’s Weight

PMOS is sometimes treated as though it is simply a weight problem.

It is not.

Some patients with PMOS live in larger bodies.

Others do not.

Weight management may improve health outcomes for some patients, but healthy lifestyle measures can provide benefits even without weight loss.

Current guidelines specifically warn clinicians about weight stigma and recommend individualized goals rather than assuming every patient needs the same weight-focused plan.

The conversation should be about health.

Not blame.

What Role Does Ultrasound Play in PMOS?

Ultrasound can be very helpful—but it has to be used correctly.

A pelvic ultrasound may help evaluate:

• Ovarian volume
• Follicle number
• The uterus
• The uterine lining
• Fibroids
• Ovarian cysts
• Other possible explanations for bleeding or pelvic symptoms

For adults, transvaginal ultrasound provides the most accurate assessment of polycystic ovarian morphology when ultrasound is needed.

But again:

An ultrasound alone does not diagnose PMOS.

And if irregular cycles and hyperandrogenism are already present, current guidelines say ultrasound is not required simply to confirm PMOS.

This is one of the reasons the new name matters so much.

PMOS Is Not the Same as Having Ovarian Cysts

This deserves its own section because the old name caused so much confusion.

The follicles seen in polycystic ovarian morphology are not the same thing as ovarian cysts such as endometriomas, dermoid cysts, or functional ovarian cysts.

A woman can have ovarian cysts and not have PMOS.

A woman can have PMOS and not have ovarian cysts.

The international consensus specifically removed the word “polycystic” because it inaccurately implied that abnormal ovarian cysts were the defining feature of the condition.

PMOS and Fertility

PMOS is a common cause of problems with ovulation.

If you do not ovulate regularly, it may take longer to become pregnant because there are fewer opportunities for an egg to be released.

But having PMOS does not mean you cannot become pregnant.

Many women with PMOS conceive naturally.

Others need help restoring or inducing ovulation.

For women with PMOS who have infertility due to anovulation and no other infertility factor, current international guidelines recommend letrozole as the first-line medication for ovulation induction.

But fertility treatment should not start with a prescription alone.

We also need to consider:

• Age
• How long you have been trying
• Whether you are ovulating
• Ovarian reserve when relevant
• Fallopian tube factors
• Partner factors
• Previous pregnancies
• General health
• Pregnancy risk factors

Again, the diagnosis is only the beginning.

Treatment Depends on What You Want to Accomplish

There is no single PMOS treatment.

The best treatment depends heavily on your current goal.

A 19-year-old who wants predictable periods and better acne does not need the same plan as a 32-year-old trying to become pregnant.

A 40-year-old focused on metabolic health and protecting her uterine lining may need something different again.

That is why treatment has to start with a question:

What matters most to you right now?

If Your Goal Is More Predictable Periods

Treatment may focus on:

• Cycle regulation
• Protecting the uterine lining
• Reducing unpredictable bleeding

Combined oral contraceptives are a first-line medication option for irregular cycles and androgen-related symptoms in appropriate patients. Progestin-based treatments may also be used for endometrial protection depending on the situation.

If Your Goal Is Pregnancy

The focus changes.

We may evaluate ovulation and other fertility factors and then discuss treatment to promote ovulation when appropriate.

For anovulatory infertility related to PMOS without another infertility factor, letrozole is currently recommended as first-line pharmacologic treatment.

Not every woman with PMOS needs IVF.

Many patients can achieve pregnancy naturally or with much simpler fertility treatment.

If Your Goal Is Improving Acne or Unwanted Hair

Treatment may include:

• Hormonal therapy
• Dermatologic treatment
• Hair-removal approaches
• Anti-androgen medication in selected patients

The appropriate choice depends on whether pregnancy is possible, medical history, and the severity of symptoms.

If Your Goal Is Metabolic Health

Treatment may focus on:

• Nutrition
• Physical activity
• Sleep
• Blood pressure
• Glucose regulation
• Cholesterol
• Weight management when appropriate
• Medication when indicated

Metformin is commonly used when metabolic features are important and may have additional benefits in selected patients.

Modern guidelines also recognize that anti-obesity medications, including GLP-1 receptor agonists, may be considered for appropriate adults according to general population indications. These medications require individualized counseling, particularly regarding pregnancy prevention, adverse effects, and the possibility of long-term therapy.

There Is No One “PMOS Diet”

Patients frequently search for:

“What is the best diet for PCOS?”

There is no single diet that has been proven to be best for every patient with PMOS.

Current international guidelines recommend healthy eating and physical activity but do not identify one specific dietary pattern or exercise program as superior for all patients.

The best plan is one that:

• Supports your medical goals
• Is nutritionally sound
• Fits your health conditions
• Is realistic
• Can be maintained

Short-term perfection is less useful than a sustainable long-term plan.

PMOS Often Requires More Than One Type of Expert

Because PMOS can affect several parts of health, some patients benefit from a team.

Depending on the patient’s needs, that may involve:

• An OBGYN
• Reproductive endocrinology and infertility
• Endocrinology
• Primary care
• Dermatology
• Nutrition specialists
• Mental health professionals
• Other specialists when appropriate

The international guideline specifically calls for improved integrated models of care because PMOS involves reproductive, metabolic, cardiovascular, dermatologic, sleep, and psychological features.

That does not mean every patient needs six specialists.

It means that treating PMOS well sometimes requires knowing when another expert should become part of the team.

Experience Matters Because PMOS Does Not Always Follow the Textbook

PMOS can be straightforward.

It can also be surprisingly difficult to unravel.

Someone may come in carrying years of:

• Lab results
• Ultrasounds
• Different diagnoses
• Medications
• Weight changes
• Menstrual changes
• Fertility concerns
• Conflicting medical opinions

The answer may not appear during the first 15 minutes of a visit.

Sometimes we need to:

1. Review old records
2. Understand the menstrual history
3. Repeat specific laboratory testing
4. Stop or account for medications that change hormone testing
5. Evaluate ovulation
6. Review or obtain imaging when appropriate
7. Exclude other endocrine conditions
8. Watch how symptoms evolve
9. Revisit the diagnosis as new information becomes available

PMOS should not become a label that is placed on a patient once and never questioned again.

It is a clinical diagnosis that should continue to make sense as the patient’s health and goals change.

The Diagnosis Is Not the Treatment Plan

This may be the most important point in the entire article.

Two women may both meet the diagnostic criteria for PMOS.

Their treatment plans may be completely different.

Patient One

Her main concern is acne and unpredictable periods.

Patient Two

She wants to become pregnant this year.

Patient Three

She has no fertility concerns but has significant metabolic risk factors.

Patient Four

Her biggest concern is going months without a period and protecting her uterine lining.

All four may have PMOS.

All four may need different treatment.

Current international guidelines specifically emphasize shared decision-making based on each patient’s characteristics, preferences, values, and desired treatment outcomes.

The diagnosis tells us what may be happening.

Your goals help determine what we should do about it.

What to Expect at a PMOS Evaluation at Women’s Health Group Chicago

At Women’s Health Group Chicago, the first goal is not to prove that you have PMOS.

It is to understand what is happening.

We may review:

• Your complete menstrual history
• How your cycles have changed
• Acne
• Facial or body hair
• Scalp hair thinning
• Weight history
• Previous hormone testing
• Previous ultrasounds
• Medications and supplements
• Pregnancy history
• Fertility goals
• Family history
• Metabolic risk factors
• Blood pressure
• Sleep
• Other medical conditions

Laboratory testing or ultrasound may then be used when it answers a specific question.

Not simply because every patient with suspected PMOS needs the same panel of tests.

Why a Whole-Person Approach Matters

PMOS is almost a perfect example of why medicine cannot always be reduced to one number.

A testosterone level is one piece.

An AMH level is one piece.

An ultrasound is one piece.

A menstrual calendar is one piece.

A glucose test is one piece.

Your weight is one piece.

None of them tells your entire story.

At Women’s Health Group Chicago, Dr. Mike looks at how those pieces fit together.

The goal is not simply to make the labs normal.

It is to understand the patient who has the labs.

Frequently Asked Questions About PCOS and PMOS

Is PCOS called PMOS now?

Yes.

In May 2026, an international consensus renamed Polycystic Ovary Syndrome Polyendocrine Metabolic Ovarian Syndrome, or PMOS. Major organizations including ASRM and the Endocrine Society support the change.

What does PMOS stand for?

Polyendocrine Metabolic Ovarian Syndrome.

The name reflects the endocrine, metabolic, and ovarian features of the condition rather than incorrectly focusing on ovarian cysts.

Why did PCOS change its name?

The term PCOS was misleading because patients do not need ovarian cysts to have the condition and the disorder affects much more than the ovaries.

The new name better describes its endocrine, metabolic, and ovarian features.

Do you need cysts on your ovaries to have PMOS?

No.

Polycystic ovarian morphology is only one possible diagnostic feature. Some patients can be diagnosed based on ovulatory dysfunction and hyperandrogenism without ultrasound findings.

Can you have polycystic ovaries without PMOS?

Yes.

Ovarian morphology alone does not establish the diagnosis. The entire clinical picture and other diagnostic criteria must be considered.

Is there one test for PMOS?

No.

There is no single test that proves a patient has PMOS.

Diagnosis requires evaluation of clinical features and exclusion of other possible causes.

Can PMOS be misdiagnosed?

Yes.

It can be incorrectly diagnosed when one isolated feature—such as an ultrasound appearance—is treated as proof of the condition. It can also be missed when clinicians assume normal ovarian imaging rules it out.

The diagnosis should follow accepted criteria and include exclusion of other possible causes.

Can I have PMOS if I am thin?

Yes.

Higher weight is common in some patients with PMOS but is not required for diagnosis.

PMOS occurs across different body sizes.

Can PMOS cause infertility?

PMOS can cause irregular or absent ovulation, which can make conception more difficult.

However, many women with PMOS become pregnant naturally or with fertility treatment.

What is the first-line fertility medication for PMOS?

For women with PMOS who have anovulatory infertility and no other infertility factor, current international guidelines recommend letrozole as first-line pharmacologic ovulation induction.

Does every patient with PMOS need metformin?

No.

Metformin can be useful for selected patients, particularly when metabolic features are important, but treatment should be individualized.

Is PMOS curable?

There is currently no single treatment that permanently eliminates PMOS.

Its symptoms and associated health risks can often be managed effectively, and treatment may change throughout a patient’s life.

Do I need treatment if I am not trying to get pregnant?

Possibly.

Pregnancy is only one part of PMOS care.

Treatment may also be important for:

• Irregular periods
• Protection of the uterine lining
• Acne
• Unwanted hair growth
• Metabolic health
• Diabetes prevention
• Cardiovascular risk factors
• Overall health

PMOS should be managed according to the features that affect the individual patient.

Get a Diagnosis That Actually Fits You

PMOS can be complicated.

That is exactly why it should not be diagnosed from one ultrasound, one lab value, one symptom—or one visit that never looks at the whole picture.

At Women’s Health Group Chicago, we believe the diagnosis should fit the patient.

Sometimes that answer becomes clear quickly.

Sometimes we need time to carefully unravel years of symptoms, testing, medications, menstrual changes, and previous diagnoses.

And sometimes the right answer is:

You do not actually have PMOS.

That matters too.

Once the diagnosis is clear, the next question becomes even more important:

What are your goals?

Do you want:

• More predictable periods?
• Protection of your uterine lining?
• Better control of acne or unwanted hair?
• Improved metabolic health?
• Help managing weight?
• Pregnancy now?
• Pregnancy several years from now?
• A plan for long-term health?

Those goals should determine the treatment.

Because PMOS is not one symptom.

It is not one lab value.

It is not one ultrasound.

And despite its old name, it was never simply about ovarian cysts.

If you have been diagnosed with PCOS or PMOS—or you have irregular periods, hormonal symptoms, metabolic concerns, or difficulty becoming pregnant and are unsure whether the diagnosis fits—schedule a comprehensive evaluation with Women’s Health Group Chicago.

The goal is not simply to give you a label.

The goal is to understand what is happening, make the diagnosis accurately and safely, and develop a plan that matches your life.