Polycystic Ovary Syndrome (PCOS)

Introduction

If you have been told that you have polycystic ovary syndrome usually shortened to PCOS — you are far from alone. PCOS is one of the most common hormonal conditions in women of reproductive age. Studies suggest it affects roughly one in ten women worldwide, though the exact number depends on which diagnostic criteria are used.

PCOS is often confusing for patients because it does not behave like a single, simple illness. It affects periods, skin, hair, weight, mood, fertility, and long-term metabolic health. Two women with the same diagnosis can have very different experiences. One may struggle mainly with irregular periods and acne; another may have difficulty becoming pregnant; a third may notice that weight is hard to manage and blood sugar tests are starting to look abnormal.

This guide is written for women who already have a PCOS diagnosis, or whose doctor is actively investigating PCOS. It explains what the condition is, how it is diagnosed, what treatment options exist for each part of the syndrome, and what long-term care looks like. PCOS cannot be “cured” in the usual sense, but it can be managed well and the steps you take in your 20s, 30s, and 40s strongly influence your health later in life.

What Is PCOS?

PCOS is a long-term hormonal and metabolic condition in which the ovaries do not function the way they typically do. Three features sit at the centre of PCOS:

• Irregular or absent ovulation — the ovary does not release an egg every month, which leads to irregular, infrequent, or absent periods.
• Higher than usual levels of androgens — hormones such as testosterone, which all women produce in small amounts. Higher androgens can cause acne, unwanted hair growth on the face or body (hirsutism), and scalp hair thinning.
• Polycystic-looking ovaries on ultrasound — the ovaries contain many small follicles, which look like tiny cysts. These are not true cysts and do not need to be removed.

An important point: the word “cyst” in the name of the condition is misleading. The small follicles seen on ultrasound are normal egg-containing structures that have not matured and ovulated. PCOS is a problem of hormones and ovulation, not of dangerous cysts.

PCOS is also closely linked to insulin resistance, a state in which the body’s cells respond less well to the hormone insulin. The pancreas then produces more insulin to compensate. High insulin levels make the ovaries produce more androgens, and they also raise the risk of type 2 diabetes, abnormal cholesterol, and cardiovascular disease later in life. This is why PCOS is now understood as both a reproductive and a metabolic condition.

Types and Patterns of PCOS

PCOS does not fall neatly into types, but doctors often describe it using the Rotterdam criteria, which look at three features: irregular ovulation, signs of high androgens, and polycystic ovaries on ultrasound. A diagnosis is made when at least two of the three are present, after other causes have been ruled out.

This produces several recognised patterns:

• Classic PCOS — irregular periods plus signs of high androgens, with or without polycystic ovaries on ultrasound. Often the most metabolically active form.
• Ovulatory PCOS — regular periods, but high androgens and polycystic-looking ovaries.
• Non-hyperandrogenic PCOS — irregular periods and polycystic ovaries without obvious skin or hair signs of high androgens.

You may also hear terms like “lean PCOS” for women who have PCOS at a normal body weight. Lean PCOS is real and can be just as challenging. Insulin resistance can still be present even when weight is normal.

Causes and Risk Factors

The exact cause of PCOS is not known. Most experts describe it as a condition with several overlapping causes rather than a single trigger.

Genetics

PCOS tends to run in families. If your mother, sister, or aunt has PCOS, irregular periods, or early type 2 diabetes, your own risk is higher. Several genes have been linked to PCOS but no single gene explains the condition.

Insulin Resistance

Insulin resistance is present in many women with PCOS, including those at a normal body weight. It is one of the central drivers of the hormonal imbalance and a key reason PCOS raises the long-term risk of type 2 diabetes.

Excess Androgen Production

The ovaries (and to a smaller extent the adrenal glands) produce higher than usual amounts of androgens. This both prevents normal ovulation and causes the skin and hair changes that many women notice.

Low-grade Inflammation

Studies suggest that women with PCOS often have mildly raised markers of inflammation in the blood. This is thought to contribute to both the hormonal imbalance and the long-term cardiovascular risk.

What PCOS Is Not Caused By

PCOS is not caused by anything you did or did not do. It is not the result of eating particular foods as a teenager, of stress, or of using contraception. These myths add unnecessary guilt to a condition that already carries emotional weight.

Signs and Symptoms

Menstrual Changes

• Periods that come less often than every 35 days, or fewer than eight or nine periods a year
• Periods that are very heavy when they do come, because the lining of the womb has built up over a longer interval
• No periods at all for months at a time
• Difficulty predicting ovulation

Skin and Hair Changes

• Acne, particularly on the jawline, chin, chest, and upper back, that does not respond well to standard skin treatments
• Hirsutism — coarse, darker hair growth on the upper lip, chin, around the nipples, on the lower abdomen, or thighs
• Thinning of the hair on the scalp, often most noticeable at the crown or along the parting
• Darkened, velvety patches of skin in the folds of the neck, armpits, or groin (acanthosis nigricans), which can be a sign of insulin resistance
• Skin tags

Weight and Metabolic Changes

• Weight gain, especially around the abdomen, that is difficult to lose
• Cravings, particularly for carbohydrates and sweet foods
• Fatigue after meals
• Pre-diabetes or type 2 diabetes diagnosed at an earlier age than expected

Fertility Difficulty

Because ovulation is irregular, becoming pregnant can take longer or may not happen without help. PCOS is one of the most common causes of difficulty conceiving, but the majority of women with PCOS can become pregnant, often with relatively simple treatment.

Mood and Mental Health

Women with PCOS have higher rates of depression, anxiety, and disordered eating than women without PCOS. This is partly biological and partly the cumulative weight of dealing with the visible symptoms and the fertility uncertainty.

Diagnosis

Diagnosing PCOS is mostly clinical, meaning it is based on the pattern of symptoms, examination findings, blood tests, and ultrasound — not on any single definitive test. The 2023 International Evidence-Based Guideline for PCOS, endorsed by ESHRE, ASRM, the Endocrine Society and other major bodies, uses an updated version of the Rotterdam criteria.

Clinical History and Examination

Your doctor will ask about your menstrual pattern, when periods began, weight changes, skin and hair changes, family history of PCOS or diabetes, and any difficulty with fertility. Examination may include checking for hirsutism, acne, hair thinning, and acanthosis nigricans, and measuring blood pressure, weight, and waist circumference.

Blood Tests

Blood tests typically include:

• Androgen levels — total and free testosterone, sometimes other androgens such as DHEA-S
• Thyroid function, prolactin, and sometimes 17-hydroxyprogesterone — not to diagnose PCOS, but to rule out other conditions that can mimic it
• LH and FSH — pituitary hormones that influence the ovary; the ratio between them is sometimes abnormal in PCOS, but normal results do not rule PCOS out
• Fasting blood glucose, HbA1c, and sometimes an oral glucose tolerance test — to screen for prediabetes and type 2 diabetes
• Lipid profile — to check cholesterol and triglycerides
• Anti-Müllerian hormone (AMH) — often raised in PCOS; the guideline now recognises AMH as an acceptable alternative to ultrasound for assessing polycystic ovarian morphology in adults

Ultrasound

A pelvic ultrasound, often done as a transvaginal scan, can show whether the ovaries have the typical multiple-follicle appearance of PCOS. Ultrasound is not used to diagnose PCOS in adolescents because polycystic-looking ovaries are common in healthy teenagers.

Ruling Out Other Conditions

Before confirming PCOS, doctors look for other conditions that can cause similar symptoms, such as thyroid disease, high prolactin levels, non-classical congenital adrenal hyperplasia, and (rarely) androgen-producing tumours or Cushing’s syndrome.

Treatment and Management

There is no single treatment for PCOS because it is not a single problem. Management is built around your specific concerns and life stage. Doctors typically focus on four areas: menstrual regularity and protection of the womb lining, androgen-related symptoms (acne, hirsutism, hair thinning), fertility, and metabolic health. Mental health is increasingly recognised as a fifth essential area.

Lifestyle as First-line Care

Across all major guidelines, lifestyle change is described as the foundation of PCOS care. The 2023 International Guideline lists healthy lifestyle — sensible eating patterns and regular physical activity — as first-line management for all women with PCOS, regardless of weight. The aim is not appearance but improvement in insulin sensitivity, ovulation, and long-term metabolic health.

For women with higher body weight, even a modest weight reduction — in the range of 5 to 10 per cent of body weight — can restore ovulation and reduce androgen-related symptoms in many cases. This is covered in more depth in the Lifestyle and Self-Management section below.

Combined Hormonal Contraception

For women who are not trying to become pregnant, the combined oral contraceptive pill is one of the most commonly prescribed treatments. It works in several ways at once:

• Provides a regular monthly bleed
• Protects the lining of the womb from building up too thickly — an important consideration in PCOS, where prolonged absence of periods can raise the long-term risk of endometrial cancer
• Lowers free androgen levels in the blood, which improves acne and slowly reduces hirsutism

The choice of pill, patch, or vaginal ring is individualised based on your overall health, blood pressure, migraine history, and smoking status. Progestogen-only options, including hormonal coils, may be used in women who cannot take oestrogen.

Metformin

Metformin is a medication originally developed for type 2 diabetes that improves how the body uses insulin. In PCOS, current guidelines recommend metformin in addition to lifestyle for women with metabolic features, or where there is a particular concern about glucose tolerance. Metformin can also help with menstrual regularity in some women and is sometimes used alongside other fertility treatments.

Anti-androgen Medications

For hirsutism and persistent acne, medications such as spironolactone are sometimes added. Anti-androgens block the effect of androgens on the skin and hair follicles. They take several months to show their full effect. Because they can affect pregnancy, they are used together with reliable contraception.

Inositols

Myo-inositol and D-chiro-inositol are supplements that have been studied in PCOS. Current guidelines describe inositols as a possible option, but evidence is still considered limited, and they are not a replacement for first-line treatment.

Cosmetic and Dermatological Treatment

Hirsutism and acne can be addressed directly as well as hormonally. Options include topical creams that slow facial hair growth, laser hair reduction, and standard dermatology treatments for acne. These are often used alongside hormonal treatment because they work on different parts of the problem.

Fertility Treatment

• Lifestyle optimisation — weight management where relevant, balanced nutrition, regular activity, and treatment of related conditions such as thyroid disease
• Ovulation induction with letrozole — current international guidelines describe letrozole as the preferred first-line medication for ovulation induction in PCOS, based on evidence of better ovulation and live birth rates compared with clomiphene
• Clomiphene citrate — an older oral medication, still widely used
• Metformin — sometimes used alone or in combination with letrozole or clomiphene
• Gonadotrophin injections — used when oral medications have not worked, under close monitoring because PCOS ovaries can respond very strongly
• Laparoscopic ovarian drilling — a surgical option used in selected cases, less common than it once was
• IVF (in vitro fertilisation) — considered when other approaches have not led to pregnancy, or when there are additional factors

Most women with PCOS who want a pregnancy can have one, often with relatively simple treatment. The right step for you is a clinical decision based on your age, how long you have been trying, partner factors, and other test results.

Lifestyle and Self-Management

Lifestyle is not a side note in PCOS care. It is described in current guidelines as central, alongside medications, and it acts on the underlying insulin resistance that drives much of the syndrome.

Eating Patterns

There is no single “PCOS diet.” The guideline emphasises that any healthy, balanced eating pattern that you can sustain long term is acceptable. Patterns that emphasise vegetables, fruit, whole grains, legumes, lean protein, nuts, and healthy fats — while limiting sugary drinks, refined carbohydrates, and ultra-processed foods — tend to improve insulin sensitivity and weight.

Some women find that lower-glycaemic-index foods help with cravings and energy. Extreme or very restrictive diets are discouraged because they are difficult to sustain and can worsen the disordered eating patterns that some women with PCOS are already vulnerable to.

Physical Activity

Major guidelines suggest at least 150 minutes a week of moderate-intensity activity, or 75 minutes a week of more vigorous activity, plus muscle-strengthening exercises on two or more days per week. Walking, cycling, swimming, dancing, yoga, and resistance training all count. The combination of aerobic activity and resistance training appears particularly helpful for insulin sensitivity in PCOS.

Sleep

Sleep problems, including obstructive sleep apnoea, are more common in PCOS than in the general population. Poor sleep worsens insulin resistance and mood. If you snore heavily, wake unrefreshed, or feel sleepy during the day, mention it to your doctor; screening for sleep apnoea is appropriate.

Mental Health Support

Anxiety, depression, and disordered eating are more common in PCOS. Psychological support — whether through your doctor, a therapist, or structured support groups — is part of well-rounded PCOS care, not an optional add-on. If you have not been asked about your mood at PCOS reviews, it is reasonable to bring it up yourself.

Smoking and Alcohol

Smoking worsens cardiovascular risk, which is already higher in PCOS. Stopping smoking is one of the most useful single steps you can take. Alcohol affects sleep, mood, and the liver, which is relevant because non-alcoholic fatty liver disease is more common in PCOS.

Monitoring and Long-Term Targets

What Is Usually Monitored

• Periods — whether they are regular, and how often they come if not
• Blood pressure — ideally at every visit
• Weight, BMI, and waist circumference — tracked over time, not as a single snapshot
• Blood glucose — many guidelines suggest screening for diabetes every one to three years, depending on risk
• Lipid profile — periodically, as part of cardiovascular risk assessment
• Mental health — routine screening for depression and anxiety
• Skin and hair changes — to track whether treatment is working

Why Periods Matter Even When You Are Not Trying to Conceive

If you have very infrequent periods (fewer than four a year), the lining of the womb can build up over time. This raises the long-term risk of endometrial hyperplasia and, in some cases, endometrial cancer. Most treatments for PCOS — the combined pill, cyclical progestogens, the hormonal coil — address this by giving the womb lining a regular “clear out.” This protection is one of the reasons doctors recommend treatment even when fertility is not the immediate concern.

Complications and Long-Term Health

Understanding the long-term picture is part of taking ownership of your care. PCOS is associated with higher risk of:

• Type 2 diabetes — the risk is several times higher than in women without PCOS, and it often appears at younger ages
• Gestational diabetes during pregnancy
• High blood pressure and abnormal cholesterol
• Non-alcoholic fatty liver disease
• Obstructive sleep apnoea
• Endometrial cancer — the absolute risk remains low, but it is higher than in women with regular periods
• Depression, anxiety, and disordered eating
• Pregnancy complications — including miscarriage, gestational diabetes, pre-eclampsia, and preterm birth

The reason for listing these is not to frighten you. It is the opposite: they are the reasons that consistent, long-term management of PCOS is worth the effort. Many of these risks can be substantially reduced by lifestyle measures, appropriate medication, and regular monitoring.

PCOS and Pregnancy

Most women with PCOS can have healthy pregnancies. Some considerations are specific to PCOS:

• Before pregnancy — lifestyle optimisation, screening for diabetes, addressing thyroid function, taking folic acid, and (if relevant) reaching a healthier weight all improve outcomes
• During pregnancy — earlier and more frequent screening for gestational diabetes is usually recommended; blood pressure is monitored carefully
• After pregnancy — women with PCOS who develop gestational diabetes have a higher lifetime risk of type 2 diabetes and should continue to be screened

If you have already had a pregnancy and are planning another, mention your PCOS history early in antenatal care so monitoring can be tailored.

PCOS in Adolescents

PCOS often begins in the teenage years, but diagnosing it in adolescents requires more caution than in adults. Many features of puberty — irregular periods in the first two to three years after menarche, acne, slightly raised androgen levels, and polycystic-looking ovaries on ultrasound — overlap with PCOS but can be normal phases of development.

Current guidelines therefore recommend that an adolescent be diagnosed with PCOS only when both persistently irregular periods (defined by how many years it has been since menarche) and clinical or biochemical signs of high androgens are present. Ultrasound is not used for diagnosis in adolescence.

When PCOS is not yet confirmed but features are present, the term “at risk of PCOS” is sometimes used. These young women are reassessed over time. In the meantime, lifestyle support and treatment of specific symptoms (such as acne or very heavy periods) can begin without committing to a formal diagnosis.

Treatment principles in adolescence are similar to those in adults — lifestyle as foundation, with combined hormonal contraception or other medications used to address specific concerns. Adolescents and their families benefit from clear, age-appropriate information and from being supported around body image and mental health, which are particularly vulnerable areas during these years.

Living with PCOS

Many women describe PCOS as exhausting not because of any single symptom but because so many parts of life are affected at once — periods, skin, hair, weight, mood, fertility plans. It is reasonable to feel that this is a lot to manage.

Building a Care Team

Depending on which features are most active for you, your care team may include a gynaecologist, an endocrinologist, a dermatologist, a dietitian, a fertility specialist, and a mental health professional. You do not need all of these at once. A primary doctor who knows your history can help you bring in others when needed.

Communication and Records

Keeping a simple record of your periods, weight, blood pressure, blood test results, and medications is genuinely useful. It allows new doctors to pick up your care quickly and helps you see trends that are not obvious from one visit to the next.

Body Image and Self-talk

Visible symptoms — acne, hirsutism, hair thinning, weight that does not respond easily to effort — can shape how women with PCOS see themselves. The shame and self-blame that follow are real, but they are not deserved. PCOS is a biological condition, not a verdict on willpower. Support — from peers, online communities, or a therapist familiar with PCOS — can make a meaningful difference.

Preventing Progression of Long-Term Risk

While PCOS itself cannot be prevented, the progression of its long-term consequences often can. The most useful steps are also the simplest:

• Keep up the lifestyle measures that help insulin sensitivity, even when symptoms are quiet
• Attend regular reviews so blood pressure, blood sugar, and cholesterol are tracked over time
• Treat related conditions promptly — high blood pressure, prediabetes, thyroid disorders, sleep apnoea
• Address mental health early rather than waiting
• Maintain a regular bleeding pattern (spontaneous or treatment-induced) to protect the womb lining
• If you smoke, plan a quit attempt with support

When to Seek Medical Advice Sooner

Most PCOS care is planned and routine. Some situations are worth bringing forward rather than waiting for the next scheduled review:

• Unusually heavy or prolonged bleeding, or bleeding between periods
• Sudden, rapid increase in body or facial hair, or deepening of the voice — these can occasionally suggest a different cause of high androgens
• Symptoms suggesting diabetes — increased thirst, frequent urination, unexplained weight loss, blurred vision
• Severe low mood, hopelessness, or thoughts of self-harm
• Difficulty conceiving after twelve months of trying (or six months if you are over 35)
• Pregnancy — let your doctor know early so monitoring can be planned

Frequently Asked Questions

Can PCOS be cured?

PCOS is a long-term condition and is not currently considered curable. However, symptoms can be very well controlled and long-term risks can be reduced. Many women find that their symptoms are quieter at different points in life, particularly with consistent management.

Will I be able to have children?

Most women with PCOS can become pregnant, often with relatively simple treatment such as lifestyle optimisation and ovulation induction with letrozole. Some women will need more intensive fertility treatment, including IVF. Age remains an important factor in fertility, so it is worth discussing your plans with your doctor early.

Does PCOS go away after menopause?

Periods naturally stop at menopause, but PCOS does not simply disappear. The metabolic features — insulin resistance, higher risk of diabetes and cardiovascular disease — continue and may even become more important with age. Long-term follow-up does not end at menopause.

Do I have to take the contraceptive pill if I am not trying to avoid pregnancy?

Not necessarily. The combined pill is one of several ways to regulate periods, protect the womb lining, and reduce androgen-related symptoms. Alternatives include cyclical progestogens, the hormonal coil, and progestogen-only methods. Whether any of these is appropriate is a decision to make with your doctor based on your specific situation.

Is weight loss the only treatment that works?

No. Weight loss can be very helpful for women with higher body weight, but PCOS also occurs in women at a normal weight, and medication and lifestyle measures benefit them too. Focusing only on weight can miss other important parts of care, including skin, hair, mental health, and metabolic monitoring.

Are inositol supplements worth trying?

Inositols have been studied in PCOS and are described in current guidelines as a possible option, but the evidence is still considered limited. They are not a substitute for established treatments. If you are considering them, it is reasonable to mention this to your doctor so it fits into the rest of your care.

Does PCOS increase the risk of cancer?

The main cancer-related concern in PCOS is endometrial cancer, linked to long gaps between periods. The absolute risk remains low, and it is reduced by treatments that produce a regular bleeding pattern. Evidence on other cancers is less clear.

Will my daughter get PCOS if I have it?

PCOS does run in families, so the risk is somewhat higher than average, but it is not a certainty. Encouraging healthy lifestyle habits in adolescence and seeking advice early if periods are very irregular allows any concerns to be addressed in good time.

Conclusion

PCOS is a long-term condition that touches many parts of life, but it is also one of the most actively researched and well-described conditions in women’s health. The treatments available today — lifestyle support, medications that target specific symptoms, modern fertility options, and structured monitoring of long-term metabolic risk — allow most women with PCOS to live full, healthy lives and to plan their families if they wish.

The most useful frame is to think of PCOS not as a problem to be fixed once, but as a part of your health to be looked after over time. Small, consistent steps — sustainable eating patterns, regular activity, a treatment plan that fits your priorities, and regular reviews — carry far more weight over the years than any single intervention. With clear information and a care team you trust, PCOS becomes a condition you manage, rather than one that manages you.