Symptoms of PCOS in Women: Causes and Care

Symptoms of PCOS in women vary widely, making this common hormonal condition easy to overlook. Polycystic ovary syndrome affects roughly 1 in 10 women in the UK and can cause irregular periods, excess hair growth, acne, and difficulty conceiving, among other signs. Because no two women experience PCOS in exactly the same way, understanding the full range of symptoms is essential for seeking timely diagnosis and appropriate care. This article explains the most common symptoms, why they vary so much between individuals, which signs need prompt medical attention, and what treatments and lifestyle changes can help.

What are the most common symptoms of PCOS in women?

The most common symptoms include irregular or absent periods, hirsutism, acne, oily skin, scalp thinning, and difficulty conceiving. Diagnosis requires at least two of three Rotterdam criteria features.

The most common symptoms of polycystic ovary syndrome (PCOS) in women include irregular or absent periods, excess hair growth (hirsutism), acne, oily skin, and difficulty conceiving. PCOS is one of the most prevalent hormonal conditions affecting women of reproductive age. The NHS estimates it affects roughly 1 in 10 women in the UK.^[1][2] Because no two women experience it identically, the condition can be easy to overlook or misattribute to other causes.

Irregular menstrual cycles are often the first sign that prompts women to seek medical advice. Periods may be infrequent (fewer than eight cycles per year), unpredictable, or absent altogether, a state known as amenorrhoea.^[4] Alongside this, elevated levels of androgens (male hormones) can cause:

• Hirsutism: unwanted hair on the face, chest, back or abdomen

• Acne and oily skin: particularly along the jawline and chin

• Scalp hair thinning: sometimes described as male-pattern hair loss

Signs of insulin resistance, such as darkened, velvety patches of skin (acanthosis nigricans) or small skin tags, may also be present and can help clinicians identify women who need further metabolic assessment.

Weight gain or difficulty managing weight is also frequently reported, and many women with PCOS carry excess weight around the abdomen. Polycystic ovaries, visible on ultrasound as multiple small follicles arranged around the ovary's edge, are another recognised feature, though their presence alone does not confirm a diagnosis.

In the UK, diagnosis is guided by NICE CKS: Polycystic ovary syndrome and the 2023 International Evidence-Based Guideline for PCOS (ESHRE/ASRM/Monash), both of which use the Rotterdam criteria: a diagnosis requires at least two of three features, namely irregular or absent ovulation, clinical or biochemical signs of elevated androgens, and polycystic ovaries on ultrasound.^[4][2] An important caveat applies to younger women: pelvic ultrasound is not recommended as a diagnostic tool within eight years of the first menstrual period, because multi-follicular ovaries are common during normal puberty.^[14][15] In adolescents, both menstrual irregularity and acne are also common in the years immediately after the first period, so clinical judgement is needed before applying a PCOS diagnosis in this age group. Recognising the full range of possible symptoms is the first step towards getting an accurate diagnosis and appropriate support.

Why does PCOS cause such varied symptoms?

PCOS disrupts multiple hormonal pathways simultaneously, including androgen production and insulin signalling, so symptoms vary depending on which imbalances predominate in each individual.

PCOS causes such varied symptoms because it disrupts several interconnected hormonal pathways simultaneously, meaning the condition can present differently depending on which imbalances predominate in each individual. At its core, PCOS involves a disruption to the normal signalling between the brain, pituitary gland, and ovaries, leading to an overproduction of androgens and, in many cases, insulin resistance.

Insulin resistance is a key driver in a significant proportion of women with PCOS. When cells do not respond efficiently to insulin, the pancreas produces more of it to compensate. Elevated insulin levels then stimulate the ovaries to produce additional androgens, which in turn interfere with normal follicle development and ovulation.^[18][19] This hormonal cascade explains why symptoms such as irregular periods, hirsutism, and acne often occur together, yet vary in severity from person to person. Importantly, insulin resistance and its consequences can occur in women with PCOS at any body weight, including those with a normal BMI, so symptoms should not be dismissed on the basis of weight alone.^[11][12]

Genetic factors also play a role. PCOS tends to run in families, and research suggests that multiple genes influence how the condition manifests.^[10] Environmental factors, including diet, physical activity levels, and body weight, can amplify or moderate the underlying hormonal disruption. For example, women with a higher BMI may experience more pronounced insulin resistance, which can worsen androgen excess and menstrual irregularity, but this is not universal.

The variability of PCOS symptoms also reflects the condition's impact across different life stages. In adolescence, normal pubertal anovulation and cycle irregularity can overlap with early PCOS features, making diagnosis more challenging and requiring caution. Women in their twenties and thirties may seek help primarily for fertility difficulties. Later in life, the metabolic consequences, including an increased risk of type 2 diabetes and cardiovascular risk factors, may become more prominent.^[6][7] Understanding this hormonal complexity helps explain why PCOS management is rarely one-size-fits-all.

Which PCOS symptoms need prompt medical attention?

Absent periods for over three months, very heavy bleeding, rapid virilisation, symptoms of diabetes, or pelvic pain all warrant timely GP review, as they may indicate complications or alternative diagnoses.

Certain PCOS symptoms warrant prompt medical attention, particularly those that suggest a significant metabolic complication, a gynaecological emergency, or a condition that could be confused with PCOS but requires different treatment. Women should contact their GP if they experience very heavy or prolonged periods, sudden worsening of symptoms, or signs that may indicate a different underlying diagnosis.

Although PCOS itself is not a medical emergency, the following situations should prompt timely review by a healthcare professional:

• Absent periods for more than three months in a woman not using hormonal contraception: a pregnancy test should be taken first, and if positive with any pain or bleeding, urgent assessment is needed to exclude ectopic pregnancy. If the test is negative, GP review is appropriate, as prolonged amenorrhoea can lead to endometrial thickening and increase the risk of endometrial hyperplasia over time.^[16][17]

• Heavy or prolonged periods: if bleeding is severe enough to soak through a pad or tampon every hour for several consecutive hours, or is accompanied by large clots or symptoms such as dizziness or breathlessness, seek urgent medical attention. NICE NG88 (Heavy Menstrual Bleeding) provides guidance on when referral or emergency care is needed.^[5]

• Rapid or severe onset of hirsutism or virilisation (such as deepening of the voice or clitoral enlargement), which may suggest an androgen-secreting tumour rather than PCOS.

• Symptoms of diabetes, including excessive thirst, frequent urination, or unexplained fatigue, given the association between PCOS and insulin resistance. Women with PCOS should be periodically screened in primary care for dysglycaemia (using HbA1c or an oral glucose tolerance test as appropriate) and for cardiovascular risk factors including blood pressure and lipid levels.

• Pelvic pain, which is not a typical feature of PCOS and may indicate an ovarian cyst complication, endometriosis, or another gynaecological condition.

• Mood changes or low mood, as women with PCOS have a higher reported prevalence of anxiety and depression, and these deserve assessment and support in their own right.^[21][22]

If symptoms develop suddenly or are accompanied by severe pain, women should contact NHS 111 for urgent advice or attend their GP promptly. For any suspected serious emergency, such as signs of ovarian torsion (sudden severe one-sided pelvic pain with vomiting), attending an accident and emergency department is appropriate. Healthcare professionals should also be aware that some medicines used in PCOS management, such as metformin, can cause gastrointestinal side effects that occasionally require review. Suspected side effects from any medicine should be reported to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

What treatments and lifestyle changes can help manage PCOS symptoms?

A balanced diet and regular physical activity form the foundation of management; medical options include the combined pill, metformin, and fertility treatments, tailored to each woman's priorities.

A combination of lifestyle modification and targeted medical treatment can effectively manage the symptoms of PCOS in most women, with the approach tailored to each individual's priorities, whether that is regulating periods, managing excess hair growth, improving fertility, or reducing metabolic risk. In the UK, primary care management is guided by NICE CKS: Polycystic ovary syndrome, with additional recommendations from the 2023 International Evidence-Based Guideline for PCOS (ESHRE/ASRM/Monash).

Lifestyle changes form the foundation of PCOS management, particularly for women with insulin resistance or excess weight. Evidence suggests that even a modest reduction in body weight can help restore ovulation, improve menstrual regularity, and reduce androgen levels in some women, though the degree of benefit varies between individuals.^[24][25] A balanced diet that limits refined carbohydrates and added sugars, combined with regular physical activity, supports insulin sensitivity without the need for extreme dietary restriction. These benefits can also be seen in women with PCOS who are not overweight.

Medical treatments are selected based on the predominant symptoms:

• Combined oral contraceptive pill: commonly used to regulate periods, reduce androgen levels, and improve acne and hirsutism. For women with persistently infrequent periods who are not seeking pregnancy, the combined pill, a levonorgestrel-releasing intrauterine system, or cyclical progestogen may also be considered to protect the endometrial lining.

• Metformin: an insulin-sensitising medicine that may be considered for women with PCOS to improve menstrual regularity and reduce metabolic risk. Metformin is used off-label for PCOS in the UK; its use is based on clinical judgement and is not a licensed indication.^[3][4] NICE CKS PCOS and the 2023 International Guideline both discuss its role.

• Topical treatments and cosmetic approaches: eflornithine cream has been used for facial hirsutism; laser hair removal and electrolysis are also used.^[27][28] Women should confirm current availability and suitability of any topical treatment with their prescriber or pharmacist, as product licensing and supply can change.

• Fertility treatments: clomifene or letrozole may be considered for women with PCOS who are trying to conceive, under specialist supervision. Letrozole for ovulation induction in PCOS is used off-label in the UK; local fertility service pathways will determine which options are available.^[4]

• Cardiometabolic screening: women with PCOS should have periodic assessment of blood pressure, lipid levels, and blood glucose or HbA1c in primary care, given the increased long-term risk of type 2 diabetes and cardiovascular disease.

For women exploring weight management as part of their PCOS care, a GP can advise on whether additional support, including referral to a specialist weight management service, is appropriate. Bolt Pharmacy is a GPhC-registered UK online pharmacy offering online weight-management consultations, with prescriber review and pharmacist support, where clinically appropriate options may be considered following consultation. Psychological support, including cognitive behavioural therapy for anxiety or low mood, should also be offered as part of holistic PCOS care, in line with NICE recommendations.

Scientific References

1. Polycystic ovary syndrome (PCOS).
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3. Polycystic ovary syndrome: metformin in women not planning pregnancy (ESUOM6) — full resource.
4. Polycystic ovary syndrome | Treatment summaries — BNF.
5. Heavy menstrual bleeding: assessment and management (NG88).
6. Type 2 diabetes and cardiovascular disease in polycystic ovary syndrome.
7. Lifestyle interventions for cardiometabolic health in women with polycystic ovary syndrome: a systematic review and network meta-analysis.
8. Recent advances in polyendocrine metabolic ovarian syndrome, formerly polycystic ovary syndrome, with emphasis on endocrine and metabolic dysfunction and cardiovascular risk.
9. Association of polycystic ovary syndrome with metabolic syndrome and its components in adolescents: a systematic review and meta-analysis.
10. Genetics of polycystic ovary syndrome.
11. Characterization of distinct polycystic ovary syndrome subtypes by cluster and principal component analyses.
12. Effect of Dietary Regimen on the Development of Polycystic Ovary Syndrome: A Narrative Review.
13. Relationship between body composition, insulin resistance, and hormonal profiles in women with polycystic ovary syndrome.
14. The value of anti-Mullerian hormone for diagnosing polycystic ovary syndrome in adolescents: a case-control study based on an epidemiological survey.
15. Update on diagnosis of polycystic ovary syndrome during adolescence.
16. Cancer risk and PCOS.
17. Uterine morphology and peristalsis in women with polycystic ovary syndrome.
18. Steroidogenic enzyme dysregulation in polycystic ovary syndrome: Mechanistic insights and emerging therapeutic strategies.
19. Decoding polycystic ovary syndrome: an integrated review of epidemiology, molecular mechanisms, animal models, and the expanding therapeutic landscape.
20. Polycystic ovary syndrome (PCOS): current insights, emerging therapeutics, and future treatment strategies.
21. Depression and anxiety among women with polycystic ovarian syndrome in low- and middle-income countries: a systematic review and meta-analysis.
22. Prevalence and outcomes of co-occurring psychiatric and endocrine, metabolic, and nutritional disorders: An atlas based on umbrella review of 254,154,533 records.
23. Yoga as a complementary intervention for polycystic ovary syndrome management: a systematic review.
24. Therapeutic Potential of Anti-Obesity Drugs in Obesity-Associated Female Reproductive Dysfunction: Translating Mechanistic Evidence into Personalized Clinical Strategies.
25. GLP-1 Receptor Agonists and Fertility: What Is Known So Far?.
26. Effects of Ketogenic Diet (KD) on Metabolic, Endocrine, and Reproductive Outcomes in Overweight/Obese Women With Polycystic Ovary Syndrome (PCOS): A Systematic Review.
27. Excessive hair growth (hirsutism).
28. A randomized bilateral vehicle-controlled study of eflornithine cream combined with laser treatment versus laser treatment alone for facial hirsutism in women.
29. Randomized, double-blind clinical evaluation of the efficacy and safety of topical eflornithine HCl 13.9% cream in the treatment of women with facial hair.
30. Eflornithine cream combined with laser therapy in the management of unwanted facial hair growth in women: a randomized trial.

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