So, you’ve been told you have polycystic ovary syndrome (PCOS).
If you’ve recently been diagnosed, you may be feeling overwhelmed, confused, or even a little scared. You’re not alone. Many women leave their appointment with more questions than answers, wondering what this diagnosis means for their health, fertility, and future.
You may have heard “PCOS” mentioned on social media, in articles, or by healthcare providers, but what does it actually mean?
You may have also been told things like, “You’ll struggle to get pregnant,” “Just go on birth control and come back when you want to conceive,” or “Just lose weight.” While these comments are common, they rarely explain what’s actually happening in your body or what you can do to manage your symptoms.
The good news is that PCOS is a well-researched hormonal conditions, and there are many evidence-based strategies that can help you feel better and improve your symptoms. Understanding what’s happening in your body is the first step.
In this article, we’ll break down what polycystic ovary syndrome is, how it’s diagnosed, the common biological processes that contribute to PCOS, and what you can do to better understand your diagnosis.
My hope is that by the end of this guide, you’ll have a clearer understanding of how PCOS affects your body and feel more confident making informed decisions about your health and lifestyle.
Let’s dive in!
What Is Polycystic Ovary Syndrome?
Polycystic ovary syndrome (PCOS) is a common hormonal condition affecting women of reproductive age, impacting an estimated 1 in 10 women worldwide. If you’ve been diagnosed with PCOS, chances are you have a family member, friend, or coworker who is living with it too.
Despite its name, PCOS is much more than a condition affecting your ovaries. It’s a complex hormonal and metabolic condition that can affect ovulation, hormone levels, insulin function, fertility, and your long-term health.
Recently, experts have proposed changing the name from Polycystic Ovary Syndrome (PCOS) to Polyendocrine Metabolic Ovarian Syndrome (PMOS) because the current name doesn’t fully capture what the condition actually involves. This change highlights an important point: PCOS affects much more than your ovaries.
PCOS develops when the body’s normal hormone balance becomes disrupted. Many women with PCOS produce higher-than-normal levels of androgens (often called “male hormones,” although everyone produces them), such as testosterone, DHEA-S, and androstenedione.
These hormonal changes can interfere with normal ovulation and contribute to many of the symptoms associated with PCOS.
Common symptoms include:
- Irregular or absent periods
- Acne
- Excess facial or body hair (hirsutism)
- Hair thinning or hair loss
- Difficulty becoming pregnant
- Weight changes or difficulty managing weight
- Strong food cravings or increased hunger
It’s important to remember that no two people with PCOS look exactly alike. Some women experience only a few mild symptoms, while others experience many. You don’t need to have every symptom to have PCOS.
One of the biggest misconceptions about PCOS is that it’s “just a hormone problem.” In reality, PCOS often involves several biological processes working together, including insulin resistance, chronic low-grade inflammation, genetics, and changes in hormone production.
These underlying factors can look different from person to person, which is why there’s no single treatment that works for everyone.
Understanding what’s driving your PCOS is one of the most important steps in learning how to manage your symptoms effectively.
How is PCOS Diagnosed?
There isn’t a single blood test or scan that can diagnose PCOS. Instead, healthcare providers look at your symptoms, medical history, blood work, and sometimes an ultrasound to determine whether you meet the diagnostic criteria.
Before making a diagnosis, your healthcare provider should also rule out other conditions that can cause similar symptoms, such as thyroid disorders, elevated prolactin levels, non-classic congenital adrenal hyperplasia, or other hormonal conditions. This helps ensure you’re receiving the correct diagnosis and treatment.
Most healthcare providers use the Rotterdam Criteria, an internationally recognized set of guidelines for diagnosing PCOS. According to these criteria, you need to have at least two of the three following features:
1. Irregular or Absent Ovulation
Many women with PCOS don’t ovulate regularly, which often leads to irregular, infrequent, or absent menstrual periods. Some women may go months without a period, while others experience unpredictable cycles that vary from month to month.
2. Higher-Than-Normal Androgen Levels
Your healthcare provider may identify elevated androgen levels through blood work or based on clinical signs of excess androgens, including acne, excess facial or body hair (hirsutism), or male-pattern hair thinning.
3. Polycystic Ovaries on Ultrasound
Some people with PCOS have ovaries that contain a larger number of small, immature follicles visible on ultrasound. Despite the name, these are not true ovarian cysts. They’re small fluid-filled follicles that haven’t matured enough to release an egg during ovulation.
It’s important to remember that you do not need polycystic ovaries to have PCOS. Many women with PCOS have normal-appearing ovaries, while some women without PCOS have polycystic-appearing ovaries.
That’s why your healthcare provider looks at the whole picture rather than relying on ultrasound findings alone.
If you’ve been diagnosed with PCOS but aren’t sure how the diagnosis was made, it’s perfectly reasonable to ask your healthcare provider which of the Rotterdam Criteria you met. Understanding your diagnosis can help you feel more informed and confident as you move forward with your care.
Why Do People Develop PCOS?
One of the first questions many women ask after being diagnosed is, “Why do I have PCOS?”
The honest answer is that there isn’t a single cause.
Researchers believe that PCOS develops because of a combination of genetics, hormones, metabolism, and environmental factors. These factors interact differently in each person, which is one of the reasons why no two women with PCOS experience exactly the same symptoms.
While we are still learning more about PCOS, several biological processes appear to play an important role in the condition. Understanding these processes can help explain why symptoms develop and why treatment often looks different from one person to the next.
Insulin Resistance
Insulin resistance is one of the most common features of PCOS, affecting an estimated 50–70% of women with the condition.
Insulin is a hormone that helps move glucose (sugar) from your bloodstream into your body’s cells, where it can be used for energy.
You can think of insulin as a key that unlocks the door to your cells. Over time, factors such as genetics, excess body fat, chronic inflammation, physical inactivity, and poor sleep can make those “locks” less responsive. As a result, your body has to produce more insulin to achieve the same effect.
This is known as insulin resistance.
Higher insulin levels don’t just affect blood sugar—they also stimulate the ovaries to produce more androgens, including testosterone. This can contribute to many of the symptoms associated with PCOS, including:
- Irregular or absent periods
- Acne
- Excess facial or body hair (hirsutism)
- Hair thinning or hair loss
- Increased hunger and food cravings
- Difficulty managing weight
Because insulin resistance is so common in PCOS, improving insulin sensitivity through nutrition, physical activity, sleep, stress management, and, when appropriate, medication is often one of the most effective ways to improve symptoms.
Genetics
PCOS often runs in families, suggesting that genetics play an important role in who develops the condition. Rather than being caused by a single gene, researchers believe PCOS results from the combined effects of many genes, each contributing a small amount of risk.
However, having a family history of PCOS doesn’t mean you’re destined to develop it.
Your genes interact with your environment throughout your life. Factors such as nutrition, physical activity, sleep, stress, and overall metabolic health can influence how those genetic tendencies are expressed. This area of research is known as epigenetics.
In other words, your genes may increase your susceptibility to PCOS, but they don’t determine your future. While you can’t change your genetics, you can make lifestyle choices that support your hormonal and metabolic health.
Chronic Stress and Inflammation
Stress and inflammation don’t cause PCOS on their own, but they may contribute to symptom severity in some women.
When you’re under ongoing physical or emotional stress, your body releases hormones such as cortisol and DHEA-S. In some women, these hormonal changes may worsen existing symptoms by affecting ovulation, insulin sensitivity, or androgen production.
Chronic low-grade inflammation has also been observed in many women with PCOS and may further contribute to insulin resistance and hormone imbalances.
This doesn’t mean your PCOS is “caused by stress.” Instead, stress and inflammation can become additional pieces of the puzzle that influence how PCOS affects your body.
Supporting stress management through adequate sleep, regular physical activity, mindfulness, social connection, and a balanced, anti-inflammatory eating pattern may help improve overall health and, for some women, reduce symptom burden.
The important thing to remember is that PCOS looks different for everyone.
Some women have significant insulin resistance, while others may notice that stress, genetics, or other factors seem to play a larger role. Most often, it’s a combination of several biological processes working together—not a single underlying cause.
What’s Next? Understanding Your PCOS
Now that you have a better understanding of what PCOS is, you may be wondering:
“What should I do next?”
While there isn’t a single test that can tell you exactly why you developed PCOS, there are several steps you can take to better understand how the condition is affecting your body.
This information can help you and your healthcare team develop a management plan that’s tailored to your symptoms, health goals, and long-term wellbeing.
Have Recommended Blood Work Completed
Blood work can provide valuable information about your overall health and help identify conditions that commonly occur alongside PCOS.
Depending on your symptoms and medical history, your healthcare provider may recommend tests such as:
- Blood glucose or an oral glucose tolerance test to assess for prediabetes or diabetes
- Hemoglobin A1c to evaluate your average blood sugar levels
- Cholesterol and triglycerides (lipid panel)
- Thyroid function tests
- Androgen levels, such as testosterone and DHEA-S
- Other hormone tests, if needed, to rule out conditions that can mimic PCOS
Because PCOS can increase the risk of conditions such as type 2 diabetes and cardiovascular disease, your healthcare provider should also monitor your blood pressure and repeat appropriate screening tests over time.
Understand Whether an Ultrasound Is Helpful
Not everyone with PCOS needs an ultrasound.
If your healthcare provider suspects PCOS based on your symptoms and blood work, you may already meet the diagnostic criteria without having one. However, an ultrasound can sometimes provide additional information by showing whether your ovaries have the characteristic appearance associated with PCOS.
Remember, you can have PCOS without polycystic ovaries, and you can have polycystic-appearing ovaries without having PCOS.
Learn About Your Family History
PCOS often runs in families. If possible, talk with close biological relatives about their health history.
Questions you might consider include:
- Has anyone else in your family been diagnosed with PCOS?
- Is there a family history of type 2 diabetes?
- Does anyone have a history of irregular periods or fertility challenges?
- Is there a family history of heart disease or high cholesterol?
While you can’t change your genetics, understanding your family history can provide valuable context for your health.
Consider Your Lifestyle and Daily Habits
Lifestyle factors don’t cause PCOS, but they can influence how symptoms are experienced and managed.
Take some time to reflect on areas that support your overall health, including:
- Your eating patterns
- Physical activity
- Sleep quality
- Stress levels
- Mental wellbeing
Small, sustainable improvements in these areas can have meaningful benefits for many women with PCOS.
Build the Right Healthcare Team
Managing PCOS often works best when you have the right support.
Depending on your symptoms, your healthcare team may include:
- Your primary care provider
- A gynecologist
- An endocrinologist
- A registered dietitian
- A mental health professional, if needed
You don’t need to navigate PCOS alone. Working with healthcare professionals who understand the condition can help you develop a plan that’s realistic, evidence-based, and tailored to your individual needs.
As a registered dietitian and certified diabetes educator, one of my favourite parts of working with women who have PCOS is helping them make sense of the overwhelming amount of nutrition information online. If you’re ready to learn more about nutrition for PCOS, these articles are a great place to start:
Since PCOS has multiple contributing factors, you may not fit neatly into one category.
While it may not always be possible to pinpoint a single root cause, here are actionable steps you should take to better understand the factors that may be contributing to your polycystic ovary syndrome.
Final Thoughts on PCOS
Receiving a PCOS diagnosis can feel overwhelming, especially if you’ve left your appointment with more questions than answers. But here’s what I hope you take away from this guide: PCOS is manageable, and you are not alone.
While researchers are still learning exactly why PCOS develops, we know that it is a complex condition influenced by hormones, metabolism, genetics, and lifestyle factors.
Understanding how PCOS affects your body is one of the most important first steps toward managing your symptoms and supporting your long-term health.
The good news is that there are many evidence-based strategies that can help.
Whether that’s improving insulin sensitivity through nutrition and physical activity, prioritizing sleep, managing stress, or working with your healthcare team to determine whether medication is appropriate, small, sustainable changes can make a meaningful difference over time.
Remember, there isn’t a one-size-fits-all approach to PCOS. Your symptoms, goals, and treatment plan will be unique to you — and that’s okay.
Ready to Learn More About Managing PCOS?
If this article helped you better understand your diagnosis, you’re already taking an important first step.
For practical, science-backed guidance on nutrition, meal planning, supplements, and lifestyle strategies, check out The PCOS Plate: Your Guide to Thriving with Polycystic Ovary Syndrome.
I created this resource to help you move beyond the confusion and misinformation online so you can feel confident making choices that support your health — without restrictive diets, unrealistic expectations, or trying to figure it all out on your own.
Wherever you are on your PCOS journey, I hope this guide reminds you that managing PCOS isn’t about being perfect. It’s about understanding your body, making informed decisions, and taking one step at a time.
Madison is a Registered Dietitian and Certified Diabetes Educator passionate about helping women with PCOS navigate nutrition with confidence. Through science-backed nutrition and lifestyle strategies, she shares practical, sustainable approaches to support hormone health, blood sugar balance, and a healthier relationship with food — one meal at a time.