PCOS/PMOS: 10 Common Misconceptions and What the Science Actually Shows

By: Mehdia Amini, MD

For decades, polycystic ovary syndrome (PCOS) was viewed primarily through a reproductive lens: irregular menstrual cycles, infertility, acne, excess hair growth, and the characteristic appearance of the ovaries on ultrasound. We now understand that this captures only part of the condition. PCOS is a complex endocrine disorder involving interactions among ovarian function, androgen production, insulin signaling, adipose tissue, and neuroendocrine regulation. Its implications can extend well beyond menstruation and fertility to glucose metabolism, cardiovascular risk factors, liver health, sleep, and psychological well-being.

In 2026, an international consensus process formally renamed PCOS as Polyendocrine Metabolic Ovarian Syndrome (PMOS). The new name was chosen to better reflect the broader endocrine and metabolic nature of the condition and to move away from the misleading emphasis on ovarian “cysts.” Because PCOS remains the more familiar term, both names are currently being used during this transition.

Here are ten common misconceptions—and what the evidence actually tells us.

Myth #1: You Need Ovarian Cysts to Have PCOS/PMOS

You do not. The structures traditionally described as “cysts” are actually small ovarian follicles, and their presence is not required for diagnosis. In adults, diagnosis is based on a combination of ovulatory dysfunction, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology or elevated anti-Müllerian hormone (AMH), after excluding other conditions that can produce similar findings. When both irregular menstrual cycles and hyperandrogenism are present, ovarian imaging or AMH is not required. Likewise, having polycystic-appearing ovaries on ultrasound does not, by itself, establish the diagnosis.

Myth #2: PCOS/PMOS Only Affects Women With Obesity

PCOS/PMOS occurs across the entire body-weight spectrum. Women at a normal BMI can have ovulatory dysfunction, androgen excess, insulin resistance, and other features of PCOS/PMOS. Excess adiposity can worsen insulin resistance and amplify both reproductive and metabolic manifestations, but obesity is not required for the diagnosis. This is why metabolic health should be evaluated individually rather than inferred from appearance or BMI alone.

Myth #3: PCOS/PMOS Makes It Impossible to Lose Weight

Weight management can be more challenging for some women with PCOS/PMOS, but weight loss is certainly not impossible. Insulin resistance is common in PCOS/PMOS and, when present, can contribute to metabolic dysfunction and weight-related challenges. At the same time, excess adiposity can further worsen insulin resistance and reproductive dysfunction. The relationship works in both directions: in women with excess weight, even modest weight loss can improve metabolic health and may improve menstrual regularity and ovulation. The answer is not simply to “try harder.” It is to identify the factors contributing to weight gain and address them with an individualized, evidence-based strategy.

Myth #4: PCOS Is Simply a Problem of High Testosterone

Androgen excess is an important feature of PCOS/PMOS, but the underlying biology is considerably more complex. For many women, insulin resistance and compensatory hyperinsulinemia contribute to increased ovarian androgen production and lower levels of sex hormone-binding globulin (SHBG), which can increase biologically available testosterone. But no single pathway explains every case. Genetic susceptibility, ovarian function, androgen biology, insulin signaling, adiposity, and neuroendocrine regulation can all contribute to the syndrome. This complexity helps explain why PCOS/PMOS can look very different from one woman to another, and why treatment should be individualized.

Myth #5: PCOS Is Caused by Poor Lifestyle Choices

It is not. PCOS/PMOS has important genetic and biological underpinnings. Nutrition, physical activity, sleep, body weight, and other environmental factors can influence how the condition manifests, but they do not mean that a patient caused her PCOS/PMOS. Lifestyle interventions can be powerful therapeutic tools when appropriate. They should be viewed as part of treatment, not as evidence of personal failure.

Myth #6: Women With PCOS/PMOS Cannot Have Children

PCOS/PMOS can make pregnancy more difficult, but it does not mean that a woman cannot have children. PCOS/PMOS is a common cause of anovulatory infertility because ovulation may occur infrequently or unpredictably. Many women with PCOS/PMOS, however, conceive naturally. For those who require assistance, effective fertility treatments are available. A diagnosis of PCOS/PMOS should therefore never be interpreted as synonymous with infertility. For many women, the problem is irregular ovulation, not an inability to become pregnant.

Myth #7: Birth Control Is the Treatment for PCOS/PMOS

Combined hormonal contraceptives can be very effective for certain manifestations of PCOS/PMOS. They can regulate menstrual bleeding, reduce androgen-related symptoms, and provide endometrial protection in women with chronic anovulation. But they do not address every aspect of the condition. Treatment should depend on the individual patient’s goals and health profile. Managing acne or excess hair growth, pursuing pregnancy, treating metabolic disease, addressing excess weight, and protecting the endometrium may each require different strategies. There is no single medication, or single treatment plan, that is appropriate for every woman with PCOS/PMOS.

Myth #8: PCOS/PMOS Is Primarily a Fertility Problem

Reproductive health is only one component of PCOS/PMOS. Women with PCOS/PMOS have an increased risk of impaired glucose tolerance and type 2 diabetes, dyslipidemia, obstructive sleep apnea, and cardiovascular risk factors. PCOS/PMOS is also associated with metabolic dysfunction-associated steatotic liver disease (MASLD). Psychological health matters as well. Depression, anxiety, disordered eating, and impaired quality of life occur more frequently among women with PCOS/PMOS. Modern PCOS/PMOS care therefore extends well beyond menstrual regulation and fertility.

Myth #9: If You Feel Fine, Your PCOS/PMOS Does Not Need Attention

Some of the most important consequences of PCOS/PMOS may produce few or no symptoms initially. A woman can feel well while developing impaired glucose regulation, dyslipidemia, hypertension, or other cardiometabolic risk factors. Chronic anovulation also deserves attention. Prolonged periods without ovulation can leave the endometrium exposed to estrogen without adequate progesterone, increasing the risk of endometrial hyperplasia and, over time, endometrial cancer.

The absolute risk of endometrial cancer remains low, and routine screening is not recommended for every woman with PCOS/PMOS. The important point is prevention: metabolic assessment, appropriate cycle regulation, and endometrial protection when indicated should remain part of care even when symptoms are minimal.

Myth #10: PCOS/PMOS Stops Mattering After the Reproductive Years

PCOS/PMOS does not simply disappear at menopause. Its clinical expression changes over time. Menstrual irregularity and fertility naturally become less relevant, while metabolic and cardiovascular health may assume greater importance. Women with PCOS/PMOS have higher rates of several cardiovascular risk factors, including type II diabetes, dyslipidemia, hypertension, and obesity. For this reason, PCOS/PMOS should be viewed across the lifespan. The priorities of treatment may change, but attention to long-term health should not end when the reproductive years do.

Looking Beyond the Diagnosis

PCOS/PMOS is not one disease that looks the same in every woman. For some, irregular cycles or infertility dominate the clinical picture. For others, androgen excess, insulin resistance, excess weight, prediabetes, sleep apnea, dyslipidemia, or other metabolic concerns become more important. That variability is exactly why effective PCOS/PMOS care requires more than treating an isolated symptom or laboratory value. A thoughtful evaluation should define the individual’s reproductive and metabolic phenotype, identify the health risks that actually apply to her, and build treatment around her priorities and stage of life.

If you have PCOS/PMOS, or suspect that you may, and your care has focused primarily on menstrual cycles or birth control, it may be worth taking a broader look at your hormonal and metabolic health. The most effective approach to PCOS/PMOS is not simply treating a diagnosis. It is understanding what the condition means for the individual woman and treating what matters to her health now and over time. Schedule with our endocrinologist Dr. Mehdia Amini to learn more!