PCOS/PMOS vs. Endometriosis—or Both? Symptoms, Fertility, and the Foundational Role of Lifestyle

By Mona Haratianfar, Nutritional Therapy Practitioner · Founder of HarmonizeHer · Evidence last reviewed: October 12, 2026

Irregular periods. Pelvic pain. Acne. Fatigue. Bloating. Unexplained weight changes. Difficulty becoming pregnant.

These symptoms are sometimes dismissed as “just hormones” or “bad periods.” But they may point to polyendocrine metabolic ovarian syndrome—PMOS, formerly called polycystic ovary syndrome or PCOS—endometriosis, or both conditions occurring together.

In 2026, an international consensus process selected polyendocrine metabolic ovarian syndrome (PMOS) as the new name for PCOS. The name is intended to better reflect the condition’s endocrine, metabolic, reproductive, and multisystem features.¹ The American Society for Reproductive Medicine has endorsed the change.² Because both terms will remain in use during the transition—and most existing research is indexed under PCOS—this article uses PCOS/PMOS when introducing the condition and PMOS thereafter.

Although PMOS and endometriosis are different conditions, they can occur together. Both can affect fertility and quality of life, and both may go unrecognized for years.

The encouraging part is that there are practical steps you can take while pursuing appropriate medical care. For PMOS in particular, nutrition, movement, sleep, stress support, and sustainable behavioral change are not optional extras. They are a foundational, first-line part of care.

The most important takeaway

For PMOS, nutrition and lifestyle are a first-line foundation of care—a powerful, evidence-based starting point that works hand in hand with the medical treatments that fit your symptoms and goals.

The international evidence-based guideline recommends lifestyle intervention for all women with PMOS to support metabolic health. It calls lifestyle management a core focus and recognizes benefits even when weight does not change.³

Depending on your symptoms and goals, nutrition and lifestyle may be combined with:

• Hormonal treatment for irregular cycles, heavy bleeding, acne, or androgen-related symptoms
• Metformin or other medical support for metabolic concerns
• Letrozole or another fertility treatment when irregular ovulation is preventing pregnancy
• Pain management, hormonal suppression, imaging, or surgery for endometriosis
• Assisted reproduction, including IVF, when indicated

Nutrition and lifestyle should work alongside appropriate medical care—not compete with it.

PMOS and endometriosis at a glance

	PMOS, formerly PCOS	Endometriosis
How common is it?	Approximately 10–13%, or about 1 in 8 women of reproductive age, when commonly used diagnostic criteria are applied. Prevalence varies with the criteria used, and many cases remain unrecognized.1,4,5	Often estimated to affect approximately 10%, or about 1 in 10 women and girls of reproductive age. The true population burden is difficult to measure because symptoms may be normalized and diagnosis can be delayed.6,7
What is happening?	A complex endocrine, metabolic, and reproductive condition involving features such as ovulatory dysfunction, androgen excess, and insulin resistance.3	Endometrial-like tissue is present outside the uterus and may contribute to inflammation, scarring, adhesions, ovarian endometriomas, and pain.6,8
Common symptoms	Irregular or absent periods, difficulty ovulating, acne, facial or body hair growth, scalp hair thinning, metabolic dysfunction, and difficulty with weight regulation.	Painful periods, chronic pelvic pain, pain during or after sex, painful bowel movements or urination, bloating, fatigue, heavy bleeding, and infertility.
Can it occur at any body size?	Yes. PMOS occurs across the weight spectrum.	Yes. Endometriosis can affect people of any body size.
How is it diagnosed?	In adults, diagnosis generally requires two of three features after other causes are excluded: ovulatory dysfunction, clinical or biochemical hyperandrogenism, and polycystic ovarian morphology. In eligible adults, anti-Müllerian hormone may sometimes be used as an alternative to ultrasound—but not as a standalone diagnostic test.3	Evaluation may include symptoms, examination, ultrasound, or MRI. A normal scan does not exclude all forms of endometriosis. Surgery can confirm endometriosis, but it is not required before every patient can begin treatment.8–10
How can it affect fertility?	Most commonly by interfering with regular ovulation.3	Through inflammation, altered pelvic anatomy, adhesions, endometriomas, tubal factors, or other effects on reproductive function.8

Could you have both?

Yes.

PMOS and endometriosis are not opposites, and having one does not rule out the other. Research on how frequently they coexist is still limited.

One 2023 study identified both conditions in approximately 2% of a small general-population cohort and 5% of a cohort undergoing gynecologic surgery. The surgical cohort included 473 women, while the population cohort included 127 women. Because PMOS was assessed using a history of diagnosis or symptoms consistent with the condition, and because these were specific study populations, the percentages should not be generalized to everyone.¹²

The practical message is more important than the exact percentage: symptoms that do not fit one diagnosis should not automatically be ignored.

For example, PMOS may help explain irregular ovulation, acne, or androgen-related symptoms. It does not fully explain severe cyclical pelvic pain, painful bowel movements, pain during sex, or an ovarian endometrioma. Those symptoms warrant a separate evaluation.

Not sure where your own symptoms fit? Take my free Root-Cause Quiz. It includes PCOS/PMOS and endometriosis screening questions to help you organize what to discuss with your healthcare provider.

Symptoms that warrant a PMOS evaluation

Consider discussing PMOS with a qualified healthcare professional if you experience:

• Cycles that are consistently irregular, far apart, or absent
• Difficulty identifying ovulation
• Persistent acne
• Increased facial or body hair
• Scalp hair thinning
• Darkened or thickened skin folds
• Difficulty regulating blood sugar
• Strong cravings or repeated energy crashes
• Difficulty becoming pregnant because of irregular or absent ovulation

Adolescents require especially careful assessment. Normal pubertal changes can overlap with adult PMOS features. Current adolescent recommendations require both persistent menstrual irregularity, defined according to time since menarche, and clinical or biochemical hyperandrogenism after other causes have been excluded. Pelvic ultrasound appearance and AMH should not be used to diagnose PMOS during adolescence because of the risk of overdiagnosis.¹¹

Symptoms that warrant an endometriosis evaluation

Talk with a gynecologist or endometriosis-informed healthcare professional if you experience:

• Period pain that interferes with school, work, or normal activities
• Pain that is worsening over time
• Chronic pelvic, hip, back, or abdominal pain
• Pain during or after sex
• Painful bowel movements or urination, especially around menstruation
• Cyclical rectal bleeding or blood in the urine
• Bloating or gastrointestinal symptoms that worsen during the cycle
• An ovarian endometrioma
• Infertility combined with pelvic pain or painful periods

A normal ultrasound does not automatically exclude endometriosis. Current U.S., Canadian, and European guidance supports evaluating symptoms, examination findings, and appropriate imaging. A clinical or presumptive diagnosis may support treatment in some patients, while the decision to pursue surgery should be individualized.^8–10

Why nutrition and lifestyle belong at the center of PMOS care

PMOS is not simply an ovarian condition. It can involve metabolic health, insulin signaling, cardiovascular risk, sleep, psychological wellbeing, and reproductive function.^1,3

That is why a plan addressing only menstruation may miss important parts of the condition.

The international guideline recommends healthy eating, physical activity, and behavioral support for all women with PMOS. It also concludes that there is not enough evidence to declare one particular diet composition superior for every metabolic, reproductive, hormonal, or psychological outcome.³

This does not make nutrition less important. It makes personalization more important.

An evidence-informed plan should consider:

• Your symptoms and diagnoses
• Glucose regulation and metabolic health
• Food preferences and cultural background
• Gastrointestinal tolerance
• Medications and supplements
• Fertility goals
• Eating-disorder history
• Budget and access to food
• Schedule, stress, sleep, and capacity for change
• Whether the plan can be maintained in real life

The goal is not to find the most restrictive diet. It is to find the most effective, nourishing, and sustainable foundation for the person living in that body.

What does the research show?

A 2026 systematic review and meta-analysis included 34 studies and 1,871 participants with PMOS. Compared with minimal intervention or usual care, lifestyle interventions were associated with greater odds of achieving regular menstrual cycles and modest improvements in waist circumference, fasting glucose, and fasting insulin.¹³

The cycle estimate—an odds ratio of 4.03—came from only five studies involving 237 participants and had a wide confidence interval and substantial between-study variation. The waist, glucose, and insulin analyses also had high heterogeneity. After studies at high risk of bias were excluded, only the improvement in fasting insulin remained statistically significant. This supports lifestyle care as an important foundation, but it does not guarantee a particular result for every person.¹³

An earlier review identified 79 randomized trials involving 4,659 women. It confirmed that lifestyle treatment is widely recommended as first-line care, but it also found substantial variation in study design and a high risk of bias in many trials. Most trials enrolled participants classified as overweight or obese, limiting how confidently the findings can be applied across the entire PMOS population.¹⁴

A meta-analysis of 20 randomized trials involving 1,113 participants found that dietary interventions were associated with improvements in menstrual regularity, ovulation, and several hormonal outcomes. The dietary approaches and study designs varied, however, so the findings should not be interpreted as proof that one restrictive diet is best for everyone.¹⁵

The balanced conclusion: lifestyle management is a strongly recommended foundation, while the evidence does not support prescribing the same diet to every person with PMOS.^3,13–15

A practical PMOS foundation

1. Build meals that support steadier energy and glucose

This does not require eliminating all carbohydrates.

A practical starting point may include:

• A meaningful protein source at meals
• Fiber-rich carbohydrates appropriate to your tolerance
• Vegetables, fruit, legumes, nuts, seeds, and healthy fats
• Pairing carbohydrates with protein, fiber, or fat
• Reducing highly refined foods and sugar-sweetened drinks
• A meal pattern that prevents long periods of restriction followed by intense hunger

Some people benefit from adjusting carbohydrate quantity, timing, or type. Others need more consistent meals, adequate protein, improved fiber intake, or help eating enough. The appropriate approach depends on the individual’s metabolic health, symptoms, preferences, and relationship with food.

2. Choose sustainable movement

Research supports exercise for metabolic health, including insulin regulation, lipid measures, inflammation, cardiovascular fitness, and quality of life. It does not establish one mandatory workout for every person with PMOS.^3,16

Options may include:

• Walking, including movement after meals
• Strength or resistance training
• Moderate aerobic exercise
• Cycling or swimming
• Higher-intensity exercise when appropriate and well tolerated
• Mobility or restorative movement during periods of pain or fatigue

A 2026 network meta-analysis of 25 randomized trials involving 1,107 participants found that exercise training improved fasting insulin, insulin-resistance measures, triglycerides, total cholesterol, and C-reactive protein compared with non-exercise controls. Results differed by exercise type and outcome, and some markers—including fasting glucose, LDL, and HDL in the overall comparison—did not improve significantly.¹⁶

Movement should support your health—not become punishment for eating.

3. Protect sleep

Poor sleep can affect energy, appetite regulation, glucose metabolism, and the ability to maintain health behaviors. PMOS is also associated with a higher prevalence of obstructive sleep apnea.³

Persistent snoring, waking unrefreshed, morning headaches, or significant daytime sleepiness should be discussed with a healthcare professional.

4. Address stress without blaming yourself

Stress management does not mean PMOS is caused by stress.

It means recognizing that chronic stress, pain, inadequate sleep, and emotional strain can affect eating patterns, energy, recovery, and quality of life.

Support may include therapy, mindfulness, breathing exercises, realistic scheduling, time outdoors, social connection, or reducing an unsustainable exercise load.

5. Use supplementation selectively

Supplements should not replace a complete nutrition and medical plan.

Their use should consider:

• Symptoms and diagnoses
• Dietary intake and laboratory findings
• Medications and possible interactions
• Pregnancy or fertility treatment
• Product quality and dosage
• The strength of the research

Inositol may be considered by some people with PMOS, but a systematic review of 30 trials involving 2,230 participants concluded that the evidence remains limited and inconclusive. Some metabolic measures may improve, but benefits are not consistent across outcomes, and the evidence is not strong enough to establish one form or dosage for everyone.¹⁷

Iron, vitamin D, vitamin B12, or other nutrients may be appropriate when intake is inadequate, a deficiency is identified, or a medication increases risk. They should not be prescribed automatically to every person with PMOS.

Personalized supplementation should mean targeted, appropriate, and monitored—not simply taking a long list of products.

What about nutrition for endometriosis?

Nutrition may support general health, gastrointestinal symptoms, energy, nutrient sufficiency, and quality of life in someone with endometriosis. However, the evidence must not be overstated.

A 2024 systematic review included 11 randomized trials with 716 participants. Many studies reported improvements in pain, but the trials varied considerably and commonly had a moderate or high risk of bias. In the meta-analysis, antioxidant supplementation was associated with lower painful-period scores, but not significant improvements in chronic pelvic pain or pain during sex. Studies at lower risk of bias did not demonstrate the same significant findings.¹⁸

A subsequent meta-analysis of nine randomized placebo-controlled trials involving 545 participants found no significant overall benefit of dietary supplements for pelvic pain, painful periods, or pain during sex. Only three trials met the authors’ strictest trustworthiness criteria.¹⁹

This does not mean nutrition is irrelevant. It means nutrition is best positioned as individualized supportive care, not as a cure or a substitute for endometriosis diagnosis and treatment.

Nutrition support may help address:

• Inadequate nutrient intake
• Iron deficiency associated with heavy bleeding
• Constipation, diarrhea, or bloating
• Coexisting IBS-type symptoms
• Energy and meal consistency
• Cardiometabolic health
• Maintaining adequate nutrition during fertility care
• Recovery before or after treatment

Highly restrictive elimination diets should not be started casually. When a time-limited elimination approach is appropriate for gastrointestinal symptoms, it should ideally be supervised and followed by a structured reintroduction phase.

What if fertility or IVF is the goal?

PMOS is a common cause of anovulatory infertility. Endometriosis may affect fertility through inflammation, adhesions, endometriomas, altered pelvic anatomy, tubal factors, and other possible pathways.^3,8

Having either condition does not mean pregnancy is impossible.

Earlier fertility evaluation may be appropriate when there is a known condition associated with infertility rather than waiting the standard 12 months for everyone. This includes very irregular or absent ovulation, known or suspected endometriosis, suspected tubal disease, sexual dysfunction, or known male-factor concerns. Age and reproductive history also affect timing.²¹

Lifestyle care can help establish a healthier metabolic and nutritional foundation before fertility treatment, but it should not create unnecessary delays.

A 2026 randomized trial included 127 women with infertility and obesity, or overweight with PMOS. The structured lifestyle group lost more weight and waist circumference and had a higher natural-pregnancy rate than usual care. However, the difference in the primary outcome—pregnancies resulting in live birth within 18 months—was not statistically significant.²⁰

For anovulatory infertility associated with PMOS and no other infertility factors, letrozole is the guideline-preferred first-line pharmacologic treatment for inducing ovulation.³ Nutrition therapy should complement, rather than replace, timely fertility evaluation and treatment.

How do you know whether your plan is helping?

Weight is not the only meaningful outcome.

Depending on your starting point and goals, consider tracking:

• Menstrual-cycle pattern
• Evidence of ovulation
• Energy and afternoon crashes
• Hunger and cravings
• Acne and androgen-related symptoms
• Sleep quality
• Strength and exercise capacity
• Digestive symptoms
• Pelvic-pain patterns
• Blood pressure
• Waist measurement, if desired and appropriate
• Clinician-ordered glucose and metabolic markers
• Quality of life

The international guideline specifically recognizes that healthy lifestyle changes can provide benefits even without weight loss.³

Frequently asked questions

Is diet really a first-line treatment for PMOS?

Lifestyle management—including nutrition, physical activity, and behavioral support—is a foundational first-line component of PMOS care and is recommended for everyone with the condition.^3,13 It works best alongside medical therapy when that is appropriate for your symptoms, metabolic health, cycle regulation, or fertility goals.

What is the best diet for PMOS?

Current evidence does not identify one diet composition as best for everyone with PMOS.³ A sustainable plan should be nutritionally adequate and personalized to metabolic health, symptoms, food preferences, gastrointestinal tolerance, fertility goals, and lifestyle.

Can diet cure endometriosis?

There is currently no strong evidence that a particular diet cures endometriosis or removes endometriosis lesions.^18,19 Nutrition may support nutrient status, gastrointestinal symptoms, general health, and quality of life, but it should not replace appropriate medical evaluation or treatment.

Can PMOS and endometriosis occur together?

Yes. Having one condition does not rule out the other.¹² Severe cyclical pelvic pain, pain during sex, painful bowel movements, or an endometrioma should not automatically be attributed to PMOS.

Should I take supplements for PMOS or endometriosis?

Not automatically. Supplementation should be individualized according to dietary intake, laboratory findings, symptoms, medications, fertility status, safety, and the quality of the evidence.^17,19

Why I wrote this

I know how exhausting it can be to live with symptoms that do not yet have a name.

For years, I experienced unexplained symptoms and pain before being diagnosed with PMOS, endometriosis, and an endometrioma. Getting my life back did not come from one food, one supplement, or one treatment. My recovery involved medical care, surgery, hormonal treatment, and a personalized foundation of nutrition, movement, sleep, stress management, and carefully selected supplementation.

As I learned how my body responded to different foods and lifestyle patterns, my insulin resistance improved substantially. I began losing weight, my skin cleared, my energy returned, and my quality of life changed in a way I had not thought possible.

That experience—together with my scientific background, professional training, and work supporting thousands of clients—shaped the way I practice today.

I do not believe in forcing every woman into the same diet. I help clients understand their patterns and build a personalized, sustainable foundation that works alongside appropriate medical care.

You do not need another generic list of foods

You need help connecting your symptoms, nutrition, lifestyle, metabolic health, and personal goals.

During a free one-on-one discovery call, we can discuss:

• The symptoms and patterns you are noticing
• Your current diagnoses and treatment
• Your fertility goals, if relevant
• What you have already tried
• Where nutrition and lifestyle support may fit
• Whether working together would be appropriate

You can also join my newsletter for evidence-informed guidance or follow me on Instagram for shorter educational resources.

About the author

Mona Haratianfar is a Nutritional Therapy Practitioner and the founder of HarmonizeHer, a nutrition and lifestyle education practice operated by HarmonizeHer LLC. Drawing on her scientific background, professional training, personal experience with PMOS and endometriosis, and work supporting thousands of clients, Mona helps women build personalized and sustainable nutrition and lifestyle foundations alongside appropriate medical care. Learn more about working with Mona.

Medical and nutritional information disclaimer

This article was written by Mona Haratianfar, Nutritional Therapy Practitioner, and published by HarmonizeHer LLC. It is for educational purposes, has not been medically reviewed by a licensed physician, and is not intended to diagnose, treat, cure, or prevent disease or replace individualized medical care. Mona is not a physician or a California-licensed healing arts practitioner. Consult a qualified healthcare professional before changing medications, supplements, diet, or treatment. Reading this article does not establish a practitioner-client relationship.

References

1. Teede HJ, et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. The Lancet. 2026;407(10545):2329–2339. DOI
2. American Society for Reproductive Medicine. PCOS is now PMOS: understanding the name change. May 27, 2026. ASRM
3. Teede HJ, Tay CT, Laven J, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Human Reproduction. 2023;38(9):1655–1679. PubMed · Full text
4. Skiba MA, Islam RM, Bell RJ, Davis SR. Understanding variation in prevalence estimates of polycystic ovary syndrome: a systematic review and meta-analysis. Human Reproduction Update. 2018;24(6):694–709. PubMed · DOI
5. World Health Organization. Polycystic ovary syndrome. WHO fact sheet
6. World Health Organization. Endometriosis. WHO fact sheet
7. De Corte P, Klinghardt M, von Stockum S, Heinemann K. Time to diagnose endometriosis: current status, challenges and regional characteristics—a systematic literature review. BJOG. 2025;132(2):118–130. PubMed
8. Becker CM, Bokor A, Heikinheimo O, et al. ESHRE guideline: endometriosis. Human Reproduction Open. 2022;2022(2):hoac009. PubMed
9. Singh SS, Allaire C, Al-Nourhji O, et al. Guideline No. 449: Diagnosis and Impact of Endometriosis—A Canadian Guideline. Journal of Obstetrics and Gynaecology Canada. 2024;46(5):102450. PubMed
10. American College of Obstetricians and Gynecologists. Diagnosis of Endometriosis: ACOG Clinical Practice Guideline No. 11. Obstetrics & Gynecology. 2026;147(3):432–448. DOI
11. Peña AS, Witchel SF, Boivin J, et al. International evidence-based recommendations for polycystic ovary syndrome in adolescents. BMC Medicine. 2025;23:151. PubMed · Full text
12. Schliep KC, Ghabayen L, Shaaban M, et al. Examining the co-occurrence of endometriosis and polycystic ovarian syndrome. AJOG Global Reports. 2023;3(3):100259. PubMed · Full text
13. Olalere O, Koh M-D, Crabb K, et al. The effect of lifestyle interventions in women with polyendocrine metabolic ovarian syndrome: a systematic review and meta-analysis. PLOS Medicine. 2026;23(9):e1004887. PubMed · Full text
14. Al Wattar BH, Hussain NM, Khan KS. Lifestyle interventions in women with polycystic ovary syndrome: a scoping systematic review of randomized evidence. Semergen. 2022;48(3):186–194. PubMed
15. Shang Y, Zhou H, He R, Lu W. Dietary modification for reproductive health in women with polycystic ovary syndrome: a systematic review and meta-analysis. Frontiers in Endocrinology. 2021;12:735954. PubMed · Full text
16. Khalafi M, Fatolahi S, Rahmatpanah G, et al. Comparative efficacy of exercise modes on cardiometabolic health in women with polycystic ovary syndrome: a systematic review with pairwise and network meta-analyses. BMC Women’s Health. 2026;26(1):70. PubMed · Full text
17. Fitz V, Graca S, Mahalingaiah S, et al. Inositol for polycystic ovary syndrome: a systematic review and meta-analysis to inform the 2023 update of the international evidence-based PCOS guidelines. Journal of Clinical Endocrinology & Metabolism. 2024;109(6):1630–1655. PubMed · Full text
18. Meneghetti JK, Pedrotti MT, Coimbra IM, da Cunha-Filho JSL. Effect of dietary interventions on endometriosis: a systematic review and meta-analysis of randomized controlled trials. Reproductive Sciences. 2024;31(12):3613–3623. PubMed
19. Salmeri N, Ragusi A, Buffo C, et al. Dietary supplements for endometriosis-associated pain: a systematic review and meta-analysis of randomized placebo-controlled trials. Gynecologic and Obstetric Investigation. Published online April 26, 2025;91(1):101–114. PubMed · Full text
20. Belan M, Giguère-Johnson M, Carranza-Mamane B, et al. Lifestyle intervention before and during fertility treatment in women with obesity or with overweight and PCOS—a randomized controlled trial. Journal of Clinical Endocrinology & Metabolism. 2026;111(6):e1643–e1652. PubMed
21. Practice Committee of the American Society for Reproductive Medicine. Fertility evaluation of infertile women: a committee opinion. Fertility and Sterility. 2021;116(5):1255–1265. PubMed

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