PCOS Symptoms and Root Causes: Why It's Now Called PMOS

Your periods have never been predictable. You get chin acne at 34 that no facial fixes. You're hungry an hour after eating, you gain weight around your middle no matter how carefully you eat, and the hair on your head is thinning while hair shows up where you don't want it.

Somewhere along the way, someone mentioned PCOS. Maybe an ultrasound showed "cysts." Maybe it didn't, and you were told you couldn't have it.

In May 2026, the condition got a new name, and the reason why tells you a lot about what's actually going on.

PCOS is now PMOS

On May 12, 2026, an international group published the new name in The Lancet: polyendocrine metabolic ovarian syndrome, or PMOS. The process was led by Professor Helena Teede at Monash University, involved 56 patient and professional organizations including the Endocrine Society, and drew on more than 22,000 survey responses over more than a decade.

The old name had a problem. "Polycystic" suggests the condition is about cysts on the ovaries. It isn't. The small follicles seen on ultrasound aren't true cysts, and the people behind the new name found no increase in abnormal ovarian cysts. Focusing on the ovaries led to missed diagnoses and treatment that ignored everything else.

The new name puts the hormones and metabolism first:

• Polyendocrine: several hormone systems are involved, not just the ovaries
• Metabolic: insulin, weight, blood sugar, and heart health are part of the condition
• Ovarian: the ovaries are still involved, through irregular ovulation and androgen production

There's a three-year transition, with the new name taking full effect in the 2028 international guideline update. You'll see both names for a while. In this article I use PCOS, because that's still what most labs, doctors, and searches use.

How common it is

The 2023 international guideline estimates PCOS affects about 10% to 13% of women of reproductive age. That's roughly 1 in 8, or more than 170 million women worldwide. The World Health Organization estimates that about 70% of people with it haven't been diagnosed.

The symptoms

PCOS looks different from woman to woman. Common signs include:

• Irregular or missing periods, or cycles longer than 35 days
• Acne, especially along the jaw, chin, and neck
• Excess hair growth on the face, chest, or belly
• Thinning hair on the scalp
• Weight gain around the middle, and difficulty losing it
• Strong cravings and energy crashes after meals
• Dark, velvety skin patches at the neck or underarms, a sign of high insulin
• Anxiety and low mood, which the guideline now says should be screened for

You don't need every symptom. And you don't need to be overweight. PCOS happens in lean women too.

The root causes

PCOS isn't one thing going wrong. It's a loop, and several drivers feed it.

1. Insulin resistance

This is the big one, and it's why "metabolic" is now in the name. The 2023 guideline recognizes insulin resistance as a core feature of PCOS, in lean women as well as women with higher weight.

When cells stop responding well to insulin, the body makes more of it. High insulin tells the ovaries to make more testosterone. It also lowers SHBG, the protein that binds testosterone, so more of it is free and active. That's the acne, the hair changes, and the irregular cycles.

For more on how this pattern shows up, see Insulin Resistance Symptoms in Women: The Sugar Sherry Archetype.

2. Androgens

Higher androgens (testosterone and related hormones) disrupt the normal growth of follicles. Instead of one follicle maturing and releasing an egg, many small follicles stall. No ovulation means no progesterone that cycle, which is why periods get irregular.

3. Inflammation

Low-grade inflammation is common in PCOS and makes insulin resistance worse. Belly fat, poor sleep, a low-fiber diet, and an out-of-balance gut all add to it.

4. The stress axis

Some women with PCOS have higher androgens from the adrenal glands rather than the ovaries. You can see this on labs as a high DHEA-S. Chronic stress, poor sleep, and overtraining can push the system further.

5. Genetics

PCOS runs in families. Genes set the stage. Diet, weight, sleep, stress, and activity decide how strongly it shows up.

Why it matters beyond your cycle

PCOS doesn't end at menopause. A 2023 review in Human Reproduction Update found that women with PCOS still had higher androgens after menopause, about three times the odds of diabetes, and higher odds of high blood pressure. Much of that risk was tied to weight, which is good news. It means it can be changed.

That's why treating PCOS only with a birth control pill to "regulate" periods misses the point. The pill can help symptoms, but it doesn't address insulin.

What helps

Food and movement come first

The guideline recommends lifestyle changes as the foundation for every woman with PCOS, whatever her weight. In practice, that looks like:

• Protein and fiber at every meal to blunt blood sugar spikes
• Fewer refined carbs and sugary drinks, not zero carbs
• Strength training. Muscle is where most glucose goes, so building it improves insulin sensitivity.
• A walk after meals. Even 10 to 15 minutes lowers the glucose spike.
• Sleep. Even a few short nights make your cells less responsive to insulin.

If weight loss is a goal, a modest loss often improves cycles and symptoms. But the guideline is clear that disordered eating is more common in PCOS and should be considered at any weight. Restrictive dieting isn't the answer.

Inositol

Inositol is a vitamin-like compound involved in insulin signaling. A 2024 meta-analysis of 30 trials, done for the international guideline, found some benefit on metabolic measures and fewer stomach side effects than metformin. But overall the evidence was limited, and metformin did better for hirsutism and waist size.

The guideline's position: inositol can be considered based on personal preference, because harm is low and there's some metabolic benefit. Myo-inositol, often combined with D-chiro-inositol, is available through my Fullscript dispensary.

Medications

Metformin improves insulin sensitivity and is recommended by the guideline for metabolic outcomes in women with a BMI of 25 or more. GLP-1 medications are increasingly used in PCOS with weight gain. Spironolactone can help acne and hair growth. Combined birth control pills regulate bleeding and lower androgens. Which fits depends on your symptoms and goals, so these are worth discussing with your clinician.

What you can do now

1. Track your cycles for a few months: start dates, length, and symptoms.
2. Ask for the right labs, including an oral glucose tolerance test, not just a fasting glucose. See How PCOS Is Diagnosed for the full list.
3. Start with meals, strength training, and sleep. These address the root cause directly.
4. Don't accept "just take the pill" as the whole plan.

PCOS, or PMOS, is a whole-body hormone and metabolic condition. Treat it that way, and most women see real change.

References

1. Teede H, et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. The Lancet. 2026. View source
2. Endocrine Society. Polyendocrine Metabolic Ovarian Syndrome: new name to improve diagnosis and care of condition affecting 170 million women worldwide. May 12, 2026. View source
3. PCOS is now called PMOS. The renaming process lasted a decade. STAT. May 12, 2026. View source
4. Teede HJ, et al. International evidence-based guideline for the assessment and management of polycystic ovary syndrome 2023: summary of recommendations. Monash University. View source
5. 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. J Clin Endocrinol Metab. 2024;109(6):1630-1655. View source
6. Millán-de-Meer M, Luque-Ramírez M, et al. PCOS during the menopausal transition and after menopause: a systematic review and meta-analysis. Hum Reprod Update. 2023;29(6):741-772. View source