PCOS stands for Polycystic Ovary Syndrome — and for a condition affecting 1 in 8 women of reproductive age, it’s extremely poorly understood.
The average woman with PCOS sees three or more health professionals and waits over two years to get diagnosed. Despite being one of the most common endocrine disorders in women of reproductive age, many never get diagnosed at all.
Part of the problem is the name. Despite being called Polycystic Ovary Syndrome, PCOS isn’t really about cysts. It’s a metabolic and hormonal condition that may involve the ovaries. That’s why in May 2026, PCOS was renamed PMOS — Polyendocrine Metabolic Ovarian Syndrome.
That shift in framing — from an ovarian condition to a metabolic one — is what changes thinking and approach. It’s also what makes PCOS unusually responsive to the things you can measure and change.
What is PCOS?
PCOS presents differently in different women.
Fertility problems: Irregular, infrequent, or absent periods. Trouble getting pregnant.
Skin and hair: Excess hair on the face, chest, or stomach. Facial and chest acne. Thinning hair on the scalp.
Weight: Weight gain around the middle that’s hard to shift. Fatigue. Sugar cravings. Glucose that’s up and down. Skin tags and darkened patches in folds of skin, like the neck or underarms, are a visible cue for insulin resistance.
How it’s diagnosed
The Rotterdam criteria are the international standard. You need two of these three, with other conditions ruled out:
- Irregular or absent periods
- Elevated androgens on blood work
- Polycystic ovary morphology on ultrasound, or a high AMH blood test
AMH — anti-Müllerian hormone — is produced by the small follicles in the ovaries. The more follicles, the higher the AMH. Women with PCOS typically have two to three times the AMH of women without it, which is why a single blood test can stand in for an ultrasound count of follicles.
The 2023 International Evidence-Based Guideline added AMH as a blood-test alternative to ultrasound — a meaningful upgrade that cuts time to diagnosis, with no waiting for a scan appointment.
The metabolic aspect
Insulin resistance is the mechanism that drives PCOS – but because of the focus on cysts, the attention has been taken away from metabolism. But this framing can guide users to lifestyle interventions that can support treatment.
Insulin tells your cells to absorb glucose. When they stop listening, the pancreas pumps out more insulin to compensate. That elevated insulin directly pushes the ovaries to make more androgens. This fuels hormonal disruption, irregular cycles, skin and hair symptoms, and difficulty losing weight.
Insulin resistance affects around 65–70% of women with PCOS. A common misconception is that you need to be overweight or pre-diabetic for it to be the driver, but roughly 20–25% of insulin resistant women with PCOS were of a healthy weight.
Insulin resistance isn’t a fixed state. It responds to food, exercise, sleep, and stress on a timescale of days and weeks, not years.
These problems feed each other. Stress raises androgens. High insulin raises androgens. High androgens disrupt the signals from the brain that should be triggering ovulation — so periods become irregular, which is itself a sign the cycle isn’t working. And inflammation quietly makes insulin resistance worse, starting the loop again.
The good news: because everything is connected, you don’t have to fix everything. Improve one thing — sleep, movement, stress, diet — and the rest tend to follow.
The long-term picture
Because PCOS is metabolic at its core, the long-term risks are metabolic too. Women with PCOS have:
- Substantially higher risk of type 2 diabetes and impaired glucose tolerance
- Raised cardiovascular risk, independent of weight
- Higher rates of endometrial cancer if cycles are very infrequent
- Significantly higher rates of obstructive sleep apnoea, even at a healthy weight
- Elevated rates of depression and anxiety — around 4× the odds of moderate-to-severe symptoms — with biological drivers, not just psychological ones
The 2023 guidelines were explicit: every woman with PCOS should have cardiovascular risk assessed, regardless of weight or age. If you have fewer than four periods a year, the uterine lining needs to be protected with progesterone or the combined pill. If you snore or wake unrefreshed, get screened for sleep apnoea — it worsens insulin resistance, which worsens PCOS.
What can you do?
Lifestyle is first-line treatment for PMOS/PCOS. That’s because the underlying metabolic mechanisms respond to lifestyle changes. These can include:
Diet: A Mediterranean-style pattern has the strongest evidence: vegetables, legumes, whole grains, lean protein, oily fish, nuts, olive oil. The single biggest change is cutting ultra-processed food, refined carbs, and added sugar — these spike insulin hardest.
Exercise: Both cardio and resistance training improve insulin sensitivity, with resistance training especially effective. 150 minutes a week is the floor. A 10-minute walk after meals measurably blunts glucose spikes — a small move with a real effect.
Sleep and consistency: Poor sleep affects insulin sensitivity and raises cortisol. Getting to 7–9 hours is important, but as important is consistent timing. An Ultrahuman study of sleep and metabolic health showed huge changes in glucose control between consistent and inconsistent sleepers.
Stress: Chronic cortisol drives both glucose and adrenal androgens. Whatever stress-management approach you’ll actually do is the right one.
Medication: The combined oral contraceptive is standard first-line for regulating cycles, protecting the endometrium, and reducing androgens, with treatment added for stubborn skin and hair symptoms.
If you are trying to conceive and struggling, see your doctor to discuss your fertility concerns.
Measuring PCOS
Real-time data and careful monitoring can support women managing PCOS. The Ultrahuman Ring with Cycle and Ovulation PRO offers 90%+ ovulation tracking accuracy, and Ultrahuman is one of the few platforms to combine cycle tracking with the M1 Live CGM for real-time metabolic insights and Blood Vision (available in the US, India and UAE) in a single ecosystem.
Metrics worth tracking are:
- Cycle length and regularity
- Glucose response to meals
- Sleep duration and quality
- HRV, resting heart rate and stress
- Weight fluctuations
Blood markers of note also include:
- Fasting glucose and fasting insulin (HOMA-IR)
- HbA1c
- Testosterone, DHEA-S and androstenedione
- LH:FSH ratio
- Thyroid panel
- Lipid panel
- AMH if fertility is in the picture
Conclusion
PCOS has long been a poorly understood condition that millions of women have struggled both to manage and diagnose. Reframing it as a metabolic condition has the potential to shorten the time to diagnosis and improve the effectiveness of treatment.
Reflects the 2023 International Evidence-Based PCOS Guidelines and current clinical consensus. Educational, not a replacement for personalised assessment from your doctor or gynaecologist.
