PCOS

What Is PCOS? A Science-Based Guide to Polycystic Ovary Syndrome

Polycystic ovary syndrome (PCOS) is one of the most common hormonal disorders affecting women of reproductive age. Current research estimates that at least 1 in 10 women have PCOS, though many remain undiagnosed or misdiagnosed for years. Because symptoms can vary widely, from irregular periods to acne, weight changes, or fertility challenges, PCOS often goes unrecognized until women begin actively seeking answers.

Although PCOS is frequently discussed as a reproductive condition, it is more accurately described as a complex endocrine and metabolic disorder. It affects the communication between the brain, ovaries, pancreas, and immune system, which is why its impact often extends far beyond the menstrual cycle.

How a Typical Menstrual Cycle Works

To understand PCOS, it helps to first understand what happens in a healthy menstrual cycle.

In a typical cycle, the brain, ovaries, and uterus work together through a hormonal feedback loop designed to prepare the body for a potential pregnancy.
• The pituitary gland releases follicle-stimulating hormone (FSH) and luteinizing hormone (LH).
• FSH stimulates the ovary to mature a follicle containing an egg.
• As the follicle grows, it produces estrogen, which thickens the uterine lining.
• A surge in LH triggers ovulation, releasing the egg from the ovary.
• The empty follicle becomes the corpus luteum, which produces progesterone to support a potential pregnancy.

This monthly sequence of follicle development, ovulation, and hormone shifts keeps the menstrual cycle regular and supports fertility.

What Happens Differently in PCOS?

When a woman has PCOS, this hormonal sequence often unfolds very differently.
• In a PCOS cycle, ovulation may not occur, or may happen infrequently.
• Many cycles are anovulatory, meaning no egg is released.
• Instead of one follicle maturing, multiple small, immature follicles may accumulate in the ovary.
• Without ovulation, progesterone levels remain low, and estrogen signaling becomes irregular.

Because ovulation is central to hormonal regulation, its absence disrupts the balance of LH and FSH. LH often remains elevated relative to FSH, which further interferes with normal follicle development. Over time, this leads to the characteristic hormonal pattern seen in PCOS.

In addition to disrupted ovulation, several other hormones are frequently affected:
• Insulin may be elevated due to insulin resistance
• Androgens (such as testosterone) are often higher than normal
• Anti-Müllerian hormone (AMH) may be elevated due to excess follicle activity

Together, these hormonal changes drive the hallmark features of PCOS.

Diagnosing PCOS

PCOS can be difficult to diagnose, in part because diagnostic guidelines have evolved over time. According to current international recommendations, a woman must meet two out of three criteria to receive a diagnosis.
• Hyperandrogenism, meaning elevated androgen levels or physical signs such as acne or excess facial hair
• Oligo-ovulation or anovulation, reflected in irregular, infrequent, or absent menstrual cycles
• Polycystic ovarian morphology (PCOM), identified by multiple follicles visible on ultrasound

Because only two criteria are required, women with PCOS may look very different from one another. This variability explains why some women struggle for years before receiving a diagnosis.

PCOS Subtypes

Based on which diagnostic features are present, PCOS is commonly divided into four subtypes.

• Subtype A includes hyperandrogenism, ovulatory dysfunction, and polycystic ovaries

• Subtype B includes hyperandrogenism and ovulatory dysfunction

• Subtype C includes hyperandrogenism and polycystic ovaries

• Subtype D includes ovulatory dysfunction and polycystic ovaries, without elevated androgens

Subtypes A, B, and C are most often associated with metabolic dysfunction and insulin resistance, while subtype D, sometimes called “lean PCOS”, appears to have a different underlying mechanism. Understanding subtypes helps explain why PCOS does not respond to a single treatment approach.

The Role of Insulin Resistance in PCOS

Insulin resistance plays a central role in many cases of PCOS. Insulin is the hormone responsible for helping glucose enter cells so it can be used for energy. When cells become resistant to insulin’s signal, the pancreas compensates by producing more of it.

Chronically elevated insulin levels have direct effects on the ovaries. High insulin stimulates androgen production and disrupts normal follicle development, making ovulation less likely. This creates a feedback loop in which insulin resistance worsens hormonal imbalance, and hormonal imbalance further impairs metabolic regulation.

Importantly, insulin resistance can occur at any body size, though it is more common and often more pronounced in women with higher levels of body fat.

Common Effects and Symptoms of PCOS

• Menstrual and Fertility Challenges

Because ovulation is irregular or absent, menstrual cycles may become long, unpredictable, or disappear entirely. When periods do occur, they may be heavy or painful. Reduced ovulation also means fewer opportunities for pregnancy, making infertility a common concern for women with PCOS.

• Weight Gain and Metabolic Changes

Many women with PCOS experience weight gain or difficulty losing weight, largely due to insulin resistance and altered fat storage. Because fat tissue is hormonally active, excess body fat can further worsen insulin resistance and inflammation.

• Elevated Androgens

Higher androgen levels can lead to acne, excess facial or body hair growth, and thinning hair on the scalp. These symptoms are often among the most emotionally distressing aspects of PCOS.

• Inflammation and Long-Term Health Risks

PCOS is associated with chronic low-grade inflammation, which may increase the risk of type 2 diabetes, cardiovascular disease, and other metabolic conditions over time.

Managing PCOS: A Supportive, Individualized Approach

There is no one-size-fits-all treatment for PCOS (or for anything else, really :) ). Management depends on symptoms, subtype, metabolic health, and personal goals. The strategies below are commonly helpful, especially when adapted to individual symptoms and guided by a healthcare professional when needed.

Nutrition Strategies:

• Prioritize high-fiber, minimally processed carbohydrates

• Emphasize fruits, vegetables, whole grains, and legumes

• Include healthy fats such as olive oil, nuts, seeds, and omega-3s

• Avoid extreme restriction or crash dieting, which can worsen hormonal stress

Movement & Exercise

• Aim for regular, consistent movement, rather than extremes.

• Resistance training can support insulin sensitivity and metabolic health.

• Low- to moderate-intensity cardio (walking, cycling, swimming) is often well tolerated.

• Pay attention to recovery—overtraining can worsen fatigue and cycle disruption.

Blood Sugar & Insulin Awareness

• Eat regular meals to avoid large blood sugar swings.

• Pair carbohydrates with protein and fat when possible.

• Notice how different foods affect energy, hunger, and cravings.

Cycle Awareness & Cycle Syncing

• Track menstrual cycles, even if they’re irregular.

• Note changes in energy, mood, appetite, sleep, and symptoms across the month.

• Use cycle syncing as a framework for awareness, not a rigid set of rules.

• Professional guidance can be especially helpful early on, particularly when ovulation is inconsistent.

Stress, Sleep & Recovery

• Prioritize sleep quality and consistency.

• Build in intentional recovery (rest days, gentle movement).

• Use stress-management tools that feel realistic: breathing practices, time outdoors, journaling, or light stretching.

Supplements & Medical Support

• Some women benefit from supplements such as vitamin D or inositol, under medical guidance.

• Medications may be appropriate in certain cases, particularly when insulin resistance is present.

• Always discuss supplements and medications with a qualified healthcare provider.

Tracking & Self-Advocacy

• Keep notes on cycles, symptoms, energy levels, and lifestyle changes.

• Bring this information to healthcare appointments.

• Don’t hesitate to seek a second opinion if concerns are not being addressed.

Living With PCOS

PCOS is a condition with many moving parts, and it doesn’t look the same from one person to the next. Hormones, metabolism, genetics, and life circumstances all play a role, which is why the experience can feel confusing or unpredictable at times.

For many women, progress begins with paying attention, learning how their body responds, noticing patterns over time, and reconnecting with their menstrual cycle where possible. Approaches like cycle syncing, which involve adjusting nutrition, movement, and rest in response to different phases of the cycle, can be a helpful framework for many women with PCOS. Cycle syncing encourages awareness and responsiveness, which can be especially valuable when cycles are irregular or symptoms fluctuate.

Because PCOS can involve disrupted ovulation, hormonal variability, and overlapping metabolic concerns, it’s often helpful to explore these strategies with professional guidance at the beginning. Working with a healthcare provider or qualified practitioner can help ensure that cycle-related approaches are appropriate, realistic, and adapted to an individual’s symptoms, particularly when cycles are irregular or when insulin resistance, fertility concerns, or other conditions are present.

With time, support, and careful observation, many women find ways to better understand their bodies and move toward steadier, more sustainable symptom management.

Ready to Cycle Syncing?

If you’re curious about diving into this practice, I created a free guide that breaks down lifestyle, diet, and workout strategies for every inner season of your cycle. It’s practical, easy to follow, and a great way to start syncing with your body.

👉 Download your free “Cycle Syncing: Diet & Workouts” guide here.

With the right knowledge, you’ll see that your cycle is actually a powerful tool to live with more energy, balance, and ease.

Want to Go Even Deeper?

And if you’re ready to take this even further, I also offer 1:1 Cycle Syncing Coaching: a personalized approach to nutrition, workouts, and lifestyle that’s designed around your unique body and rhythm. Because syncing your cycle is powerful, but tailoring it makes it life-changing.