PMOS and Endometriosis Are Not the Same Thing

PMOS and endometriosis come up together a lot. They both affect the reproductive system. They both mess with your cycle. And they're both conditions that take way too long to get diagnosed.

But they are not the same condition. They have different causes, different symptoms, and different treatment paths. Confusing them, or assuming one looks like the other, can delay getting the right support.

So let's be clear about what each one actually is.

At a Glance

Here's where the two conditions differ and where they overlap.

The two conditions can also co-exist in the same person. Having one doesn't rule out the other.

What Is Endometriosis?

Endometriosis is newly described as a: systemic chronic inflammatory condition where tissue similar to the uterine lining, the endometrium, is found outside the uterus.

The primary symptom is pain. Not just period pain. Pain that is severe, consistent, and often debilitating.

Where the tissue has grown determines what else hurts. Some people experience pain during sex. Others during urination or bowel movements. Some experience all of the above.

OTC painkillers often fail to manage endometriosis pain adequately. If paracetamol or ibuprofen is not touching your period pain, that is worth raising with your doctor.

How Is Endometriosis Diagnosed?

Diagnosis usually starts with an ultrasound. But ultrasound alone doesn't always give the full picture. An MRI or laparoscopy (a small surgical procedure to view the abdomen directly) is often needed for a more complete diagnosis.

This is part of why diagnosis takes so long. The condition is easy to miss on basic imaging. Endometriosis affects around 10% of women and girls globally. It is not rare. It is under-diagnosed.

What Is PMOS?

PMOS (previously PCOS) is a hormonal and metabolic condition. It is not primarily a condition of the uterus. It is a condition of hormonal imbalance.

The two main drivers are high androgen levels and insulin resistance. These disrupt the normal hormonal cycle. Eggs are not released properly during ovulation, which leads to irregular or absent periods.

The high circulating androgens also cause symptoms that are visible on the body: acne, excess hair growth on the face or body, and hair thinning or loss on the scalp. Weight gain and difficulty managing weight are also common.

How Is PMOS Diagnosed?

A PMOS diagnosis requires any two of the following three:

• Signs of increased androgens (in blood tests or visible symptoms)
• Absent or irregular ovulation, seen through irregular periods
• Cystic ovaries visible on ultrasound

PMOS is also a diagnosis of exclusion. Your doctor will test for other possible causes of your symptoms first. Thyroid dysfunction, for example, can cause similar irregularities and needs to be ruled out.

PMOS affects 6-13% of women globally. Like endometriosis, it is common and frequently diagnosed late.

How Are They Treated?

Both conditions are chronic. That word matters. It means symptoms can ease off for stretches of time before returning. There is no one-time fix for either.

That makes sustainable, long-term management the goal. Not just short-term relief.

One thing worth saying clearly about PMOS: there is currently no long-term curative therapy.

Management focuses on reducing symptoms and preventing complications. For many people, that means years of adapting the approach based on what is happening in their body at any given stage.

If you feel your symptoms are not being taken seriously, or that your care plan is not working for you, seek a second opinion. Both conditions require personalised, evolving care. A doctor who dismisses your concerns is not the right fit.

The Bottom Line

Endometriosis and PMOS are both under-recognised. Both take too long to diagnose. And both require more than a one-size-fits-all treatment plan.

If you suspect you might have either condition, track your symptoms. - Note when pain appears in your cycle, how severe it is, and what it affects. - Note your period regularity, your skin, your energy, your weight. Bring that record to your doctor.

The more information you can give them, the sooner they can give you answers.

REFERENCES & CITATIONS

• References & Citations
• 1. World Health Organization. (2023). Endometriosis. WHO Fact Sheets.
• 2. World Health Organization. (2025). Polycystic ovary syndrome. WHO Fact Sheets.
• 3. De Corte, P., et al. (2024). Time to Diagnose Endometriosis: Current Status, Challenges and Regional Characteristics. BJOG.
• 4. Gibson-Helm, M., et al. (2016). Delayed diagnosis and a lack of information associated with dissatisfaction in women with PMOS. Journal of Clinical Endocrinology & Metabolism.
• 5. Chen, Y., Waseem, S., & Luo, L. (2025). Advances in the Diagnosis and Management of Endometriosis. Pathology - Research and Practice, 266, 155813.
• 6. Shukla, A., Rasquin, L. I., & Anastasopoulou, C. (2025). Polycystic Ovarian Syndrome. StatPearls, NCBI Bookshelf.
• 7. Dason, E. S., et al. (2024). Diagnosis and management of polycystic ovarian syndrome. Canadian Medical Association Journal, 196(3), E85-E94.
• 8. Barnard, N. D., et al. (2023). Nutrition in the prevention and treatment of endometriosis: A review. Frontiers in Nutrition, 10.
• 9. Hussaini, H. a. D. A., et al. (2024). Management of Endometriosis-Related Pain. Cureus.
• 10. Moran, L. J., et al. (2010). Polycystic ovary syndrome and weight management. Women's Health, 6(2), 271-283.