PCOS & Your Hormones: The Full Guide

What Is PCOS, Really?

Polycystic ovary syndrome (PCOS) is one of the most common hormonal conditions affecting women of reproductive age, yet it remains one of the most misunderstood. The name itself is a little misleading: you do not need to have cysts on your ovaries to be diagnosed, and many women with ovarian cysts do not have PCOS at all. What PCOS actually describes is a hormonal pattern, one characterised by elevated androgens, disrupted ovulation, and often, insulin resistance.

According to the National Institute of Child Health and Human Development, PCOS affects between 6 and 12 percent of women of reproductive age in the United States, making it the most common endocrine disorder in this population. Despite its prevalence, the average woman waits two years and sees three or more healthcare providers before receiving a diagnosis.

Understanding what is actually happening hormonally inside a PCOS body is the first step toward working with your biology rather than against it.

The Hormonal Picture: What Is Happening Inside?

PCOS is not a single condition with a single cause. It sits on a spectrum, and the hormonal patterns can vary significantly from person to person. That said, there are several key hormonal disruptions that tend to appear repeatedly.

Elevated Androgens

Androgens are often called "male hormones," but women produce them too, and they play important roles in libido, muscle development, and bone health. In PCOS, the ovaries (and sometimes the adrenal glands) produce androgens in excess. This excess drives many of the outward symptoms most people associate with PCOS: acne along the jawline and chin, unwanted facial or body hair, scalp hair thinning, and oily skin.

Elevated androgens also directly interfere with follicle development inside the ovaries. Instead of one dominant follicle maturing and releasing an egg each cycle, multiple small follicles begin developing but stall, creating the characteristic "string of pearls" appearance on ultrasound.

Disrupted LH and FSH Signalling

In a typical cycle, the pituitary gland releases follicle-stimulating hormone (FSH) and luteinising hormone (LH) in a carefully timed sequence. In PCOS, the ratio of LH to FSH is often elevated, with LH surging higher than normal. This altered ratio further stimulates androgen production and makes it harder for a dominant follicle to mature and release an egg, disrupting or preventing ovulation altogether.

Insulin Resistance

This is arguably the most important piece of the PCOS puzzle, and it is the one most often underexplained. Research suggests that up to 70 percent of women with PCOS have some degree of insulin resistance, regardless of body weight. When cells become resistant to insulin, the pancreas compensates by producing more of it. High circulating insulin then signals the ovaries to produce more androgens, creating a hormonal feedback loop that sustains and worsens the condition.

"Insulin resistance is the engine driving PCOS for the majority of women. Addressing blood sugar and insulin sensitivity is not optional in PCOS care, it is foundational."

Dr. Felice Gersh, MD, OB/GYN and Integrative Medicine Specialist, Integrative Medical Group of Irvine

Low Progesterone

When ovulation does not occur, the corpus luteum, the temporary gland that forms after an egg is released and produces progesterone, never forms. This means progesterone levels remain chronically low across the cycle. Without the balancing effect of progesterone, estrogen goes relatively unopposed. Over time, this can contribute to irregular or very heavy periods, difficulty with mood regulation, and an increased risk of endometrial buildup.

Diagnosing PCOS: The Rotterdam Criteria

Most clinicians use the Rotterdam Criteria to diagnose PCOS. A diagnosis requires two of the following three features to be present:

• Irregular or absent ovulation (reflected in irregular or missing periods)
• Clinical or biochemical signs of elevated androgens (visible symptoms or elevated testosterone/DHEA-S on blood tests)
• Polycystic ovarian morphology on ultrasound (12 or more small follicles, or increased ovarian volume)

It is worth noting that other conditions must be ruled out before a PCOS diagnosis is confirmed. Thyroid disorders, elevated prolactin, congenital adrenal hyperplasia, and Cushing's syndrome can all produce overlapping symptoms. A thorough workup with a knowledgeable provider is essential.

PCOS Does Not Look the Same in Every Woman

One of the most important things to understand about PCOS is its variability. Research has identified at least four distinct phenotypes, ranging from those with all three Rotterdam features to those with only two. Some women with PCOS have regular periods but elevated androgens. Others have irregular cycles with no obvious androgen symptoms. Some are lean with significant insulin resistance; others carry more weight but have minimal metabolic disruption.

"PCOS is an umbrella term covering several different hormonal patterns. What works beautifully for one woman may do nothing, or even cause harm, for another. Personalisation is everything."

Dr. Lara Briden, ND, Naturopathic Doctor and Author of "Period Repair Manual," Private Practice, Christchurch, New Zealand

This variability is why a one-size-fits-all approach to PCOS rarely works. Understanding your own pattern, through blood tests, cycle tracking, and symptom mapping, allows you to target what is actually driving your hormonal disruption.

PCOS and Your Menstrual Cycle

The most common cycle presentation in PCOS is oligomenorrhoea (infrequent periods, typically fewer than eight per year) or amenorrhoea (absent periods). When periods do arrive, they may be very light due to lack of ovulation, or very heavy if significant endometrial buildup has occurred.

Tracking your cycle is particularly valuable when you have PCOS, not just to note when your period arrives, but to observe ovulation signs, basal body temperature patterns, and cervical mucus changes. These data points can help you and your provider understand whether, and when, ovulation is occurring, and how to support it more consistently.

Some women with PCOS do ovulate, just later in their cycle or unpredictably. A cycle that runs 40, 50, or 60 days may still include ovulation, and tracking can reveal this pattern. The Office on Women's Health notes that irregular periods are one of the earliest and most consistent signs that something is disrupting ovulation.

Supporting Your Hormones With PCOS: Evidence-Based Approaches

Blood Sugar Stability Is the Foundation

Because insulin resistance drives androgen overproduction in the majority of PCOS cases, stabilising blood sugar is one of the most powerful things you can do. This means prioritising protein and fibre at every meal, reducing refined carbohydrates and sugary foods, spacing meals evenly throughout the day, and eating carbohydrates alongside fat and protein rather than alone.

Research consistently shows that even modest improvements in insulin sensitivity reduce androgen levels, improve ovulation frequency, and help regularise cycles in women with PCOS. You do not need to eliminate carbohydrates; the quality and context of how you eat them matters most.

Targeted Movement

Exercise is one of the most evidence-backed tools for improving insulin sensitivity and reducing androgen levels in PCOS. Both resistance training and moderate-intensity cardio have been shown to improve metabolic markers. However, it is worth noting that excessive or very intense training without adequate recovery can raise cortisol, which in turn raises androgens and worsens insulin resistance. In PCOS, more is not always better when it comes to exercise.

Nutrients That Support PCOS Specifically

Several nutrients have strong evidence for PCOS support:

• Inositol (particularly myo-inositol and D-chiro-inositol): Improves insulin signalling, supports ovulation, and reduces androgen levels. This is one of the most studied supplements for PCOS.
• Magnesium: Supports insulin receptor sensitivity and helps regulate the stress response, which can worsen hormonal disruption.
• Zinc: Reduces excess androgens and supports ovarian function; often found to be low in women with PCOS.
• Vitamin D: Deficiency is highly prevalent in PCOS and linked to worse insulin resistance and ovulatory disruption.
• N-acetylcysteine (NAC): An antioxidant that improves insulin sensitivity and has been shown in clinical trials to rival metformin in some PCOS parameters.

Stress and the Adrenal Component

In a subset of women, PCOS is driven primarily by adrenal androgen overproduction rather than ovarian. Elevated DHEA-S (an adrenal androgen) on blood tests points to this pattern. For these women, stress management is not a nice-to-have, it is a core part of treatment. Chronic psychological stress elevates cortisol, which in turn stimulates adrenal androgen production. Practices that support the nervous system, including breathwork, gentle movement, adequate sleep, and reducing inflammatory triggers, can meaningfully shift this pattern.

Supporting Liver Detoxification

The liver plays a central role in clearing excess androgens and estrogen from the body. When liver function is compromised by poor diet, alcohol, environmental toxins, or nutrient deficiencies, hormone clearance slows. Cruciferous vegetables (broccoli, cauliflower, Brussels sprouts), adequate protein, B vitamins, and reduced alcohol intake all support healthy liver processing of hormones.

PCOS and Mental Health: The Overlooked Connection

PCOS significantly increases the risk of anxiety, depression, and disordered eating. This connection is bidirectional. The hormonal disruptions in PCOS directly affect neurotransmitter production and mood regulation. At the same time, the visible symptoms of PCOS, acne, hair changes, weight fluctuations, and fertility challenges, carry a significant psychological burden. Studies suggest that women with PCOS are three times more likely to experience depression than those without the condition.

Addressing the psychological dimension of PCOS is not secondary to physical treatment. It is integral. Cycle tracking can help here too: understanding that your mood, energy, and clarity shift in predictable patterns related to your hormones allows you to plan with more self-compassion and less self-blame.

PCOS and Fertility

PCOS is the leading cause of anovulatory infertility, meaning infertility caused by not ovulating. However, the majority of women with PCOS who want to conceive are able to do so with appropriate support. Because ovulation is the key challenge, interventions that improve ovulation frequency, including inositol supplementation, lifestyle changes, and in some cases medication, can meaningfully improve fertility outcomes.

Tracking ovulation carefully, using basal body temperature, ovulation predictor kits, and cervical mucus observation, is particularly useful in PCOS because ovulation may occur later and less predictably than in typical cycles. Many women with PCOS have conceived naturally once their ovulation patterns were better understood and supported.