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Health condition

Polycystic ovaries, and why a scan finding is not always PCOS.

Being told you have polycystic ovaries can be worrying. Many people have them without symptoms, while polycystic ovary syndrome is a diagnosis with its own criteria. This short guide explains the difference.

See how PCOS is diagnosed

Want the complete picture? Read our full guide to polycystic ovary syndrome (PCOS) or the PCOS overview.

A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against NICE, RCOG and the 2023 International Evidence-Based Guideline for PCOS.

  • 03

    Current for 2026

    Reflects the 2023 guideline, including AMH as an alternative to ultrasound in adults.

Key facts

A scan appearance, or a syndrome.

The words sound alike, but they mean different things. Here is what separates them, in plain English.

  • Polycystic ovaries

    An ultrasound description - many small follicles in the ovary. It is a scan appearance, not a diagnosis, and it is not a set of true cysts.

  • PCOS

    A hormonal and metabolic syndrome. Diagnosed from symptoms and tests, with the scan as only one possible piece of evidence.

  • Common finding

    Many women with regular periods and no symptoms have polycystic-appearing ovaries. On its own it needs no treatment.

  • Rotterdam criteria

    Any 2 of 3: irregular or absent ovulation, clinical or blood-test signs of high androgens, polycystic ovarian morphology. Other causes are excluded first.

  • AMH blood test

    The 2023 international guideline allows anti-Müllerian hormone (AMH) as an alternative to ultrasound in adults. It is not advised for adolescents.

  • Why the label matters

    PCOS carries long-term links with insulin resistance, type 2 diabetes, endometrial thickening and mood - so it deserves a proper assessment.

The primary guide

Looking for everything on PCOS in one place?

Our full guide covers causes, tests, fertility, long-term health and treatment in depth.

Full PCOS guide PCOS overview

How the diagnosis is made

From a scan report to a clear answer.

The steps a UK GP or gynaecologist will normally follow - so you know what to expect and why the scan is only one part of it.

  1. 01

    Assessing

    A pattern or a scan finding

    Long or missing periods, acne, unwanted hair - or polycystic ovaries noted incidentally on a pelvic scan.

  2. 02

    Assessing

    Exclude other causes

    Pregnancy, thyroid disease, raised prolactin and rarer adrenal or pituitary conditions can mimic PCOS.

  3. 03

    Assessing

    Blood tests

    Testosterone with SHBG, TSH and prolactin; FSH and LH if periods have stopped. HbA1c and lipids for metabolic screening.

  4. 04

    Confirming

    Ultrasound or AMH

    Needed only if fewer than two criteria are met. Ultrasound is not used within 8 years of a first period; AMH is not advised in adolescents.

  5. 05

    Confirming

    Rotterdam criteria applied

    Two of the three features, with other causes excluded, confirms PCOS. Scan appearances alone do not.

  6. 06

    Planning

    Metabolic and mood screen

    Weight, blood pressure, glucose or HbA1c, lipids, and a check for anxiety, low mood and sleep problems.

  7. 07

    Planning

    An individualised plan

    Cycle control, skin, fertility and long-term health priorities decide which treatments come first.

Typical timeline: blood tests within days, and a confirmed answer at one or two visits.

Symptoms

What PCOS can look and feel like.

Polycystic ovaries alone cause no symptoms. These features point towards PCOS - and no two people have exactly the same mix.

  • Irregular or absent periods

    Long gaps or fewer than 8 periods a year - the most common sign of irregular ovulation.

  • Acne

    Persistent or adult acne, often along the jaw and chin, driven by androgens.

  • Excess hair (hirsutism)

    Coarse hair on the face, chest, back or abdomen - a clinical sign of high androgens.

  • Scalp hair thinning

    Thinning at the crown or widening parting - androgenic hair loss can occur in PCOS.

  • Weight gain

    Weight gain, especially around the middle, and difficulty losing it - linked to insulin resistance.

  • Insulin resistance

    Dark, velvety patches of skin (acanthosis nigricans) and a higher lifetime risk of type 2 diabetes.

  • Difficulty conceiving

    Infrequent ovulation can make pregnancy slower to happen - and it is usually very treatable.

  • Low mood and anxiety

    Depression and anxiety are more common in PCOS and deserve screening in their own right.

Treatment

How PCOS is treated in the UK.

Treatment follows your priorities - cycle, skin and hair, fertility or long-term health. If your only finding is polycystic-appearing ovaries, none of this is usually needed.

  • Lifestyle and modest weight loss

    Even around 5 percent weight loss can improve cycles, symptoms and metabolic risk. Focus on sustainable habits, not crash diets.

  • Combined oral contraceptive

    Regulates bleeding, protects the womb lining and reduces androgen effects on skin and hair. First-line for many who do not want to conceive.

  • Metformin

    Improves insulin resistance and can help cycle regularity and weight. Used off-label in PCOS, most often for metabolic features.

  • Cyclical progestogen

    Where periods are infrequent, a course every few months triggers a bleed and protects the endometrium. A levonorgestrel coil is another option.

  • Anti-androgens

    Spironolactone or cyproterone for hirsutism and hair thinning, only with effective contraception because of the risk to a male fetus.

  • Letrozole or clomifene

    Ovulation induction when trying to conceive. Guidelines favour letrozole, which is used off-label in the UK, under specialist supervision.

  • Laparoscopic ovarian drilling

    A keyhole procedure used selectively when drugs to induce ovulation have not worked, or are not suitable.

  • IVF

    Considered when ovulation induction has not led to pregnancy or another fertility factor is present. Ovarian hyperstimulation risk is managed carefully.

  • Mental health support

    Screening for anxiety, depression and body-image distress is part of good care, with talking therapy or medication where needed.

For the detail behind each option, including doses, monitoring and pregnancy planning, see the full PCOS guide. Acne is often the first concern - our acne guide covers skin treatment.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and international consensus, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or gynaecologist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • International Evidence-Based Guideline for the Assessment and Management of Polycystic Ovary Syndrome (2023).

  • NICE. Polycystic ovary syndrome (Clinical Knowledge Summary).

  • RCOG. Long-term consequences of polycystic ovary syndrome (Green-top Guideline 33).

  • NICE. Fertility problems: assessment and treatment (CG156).

  • Rotterdam ESHRE/ASRM-Sponsored PCOS Consensus Workshop Group (2004). Revised diagnostic criteria for PCOS.

Red flags

When to seek advice promptly.

Most people with polycystic ovaries or PCOS are managed well in primary care. These are the situations that need a quicker review.

  • No period for 3 to 6 months or more

    A long gap without bleeding can allow the womb lining to thicken. Ask about cyclical progestogen or a coil.

  • Very heavy or prolonged bleeding

    Especially after a long gap - the lining may need assessing for endometrial hyperplasia.

  • Rapid hair growth or deepening voice

    Fast-onset virilisation is unusual in PCOS and needs prompt investigation to exclude an androgen-secreting tumour.

  • Bleeding after the menopause

    Any postmenopausal bleeding needs urgent GP assessment, particularly with a history of irregular periods.

  • Sudden severe pelvic pain

    Especially with nausea or fainting - may signal a ruptured or twisted ovarian cyst and needs urgent care.

  • No pregnancy after 12 months of trying

    Ask for a fertility assessment earlier if you are over 36 or already know your cycles are irregular.

  • Raised blood sugar

    Increased thirst, passing lots of urine or an HbA1c in the prediabetes range warrants review.

  • Persistent low mood or hopelessness

    Do not wait. Speak to your GP, or seek urgent help if you have thoughts of harming yourself.

Living with it

Understood, monitored, and very treatable.

Whether you have polycystic ovaries with no symptoms or a full PCOS diagnosis, a few habits and the right support make the biggest difference.

A quiet reminder

Your scan report is not the whole story.

Symptoms, blood tests and how you feel matter more than the wording of one ultrasound. Related reading: ovarian cysts and absent periods.

  1. 01 Perspective

    A scan finding is not a sentence

    Polycystic-appearing ovaries with regular periods and no symptoms usually need no treatment - just awareness.

  2. 02 Health

    Small changes carry weight

    Regular movement, balanced meals and good sleep support insulin sensitivity, mood and cycle regularity.

  3. 03 Fertility

    Most people can conceive

    With ovulation induction or, if needed, IVF, most people with PCOS go on to have children.

  4. 04 Support

    Ask for the whole picture

    Skin, hair, weight and mood matter as much as periods. Ask for care that covers all of them.

Frequently asked

Everything we get asked about polycystic ovaries.

Quick answers on scans, the PCOS criteria and fertility.

  • Are polycystic ovaries the same as PCOS?

    No. Polycystic ovaries describe how the ovaries look on ultrasound - many small follicles. PCOS is a syndrome diagnosed when at least two of three features are present: irregular or absent ovulation, signs of high androgens, and polycystic ovarian morphology, after other causes are excluded.

  • Can I have polycystic ovaries and not have PCOS?

    Yes. Polycystic-appearing ovaries are seen in a sizeable minority of women with regular periods and no other symptoms. Without irregular ovulation or high androgens, this does not meet the criteria for PCOS.

  • Are polycystic ovaries full of cysts?

    No. The follicles seen on a scan are normal, immature egg sacs that have not matured or released an egg. They are not the fluid-filled cysts that can occasionally cause pain, and they do not need removing.

  • Do I need an ultrasound to be diagnosed with PCOS?

    Not always. If irregular ovulation and high androgens are already present, the diagnosis can be made without one. In adults, the 2023 guideline allows an AMH blood test as an alternative to ultrasound when a third criterion is needed.

  • Do polycystic ovaries affect fertility?

    Polycystic ovaries alone may not. When PCOS causes infrequent ovulation, conceiving can take longer, but ovulation induction with letrozole or clomifene, ovarian drilling and IVF are all effective options.

  • What should I do if my scan report says polycystic ovaries?

    Look at the whole picture. If your periods are regular and you have no acne, excess hair or hair thinning, it is often an incidental finding. If not, see your GP for blood tests and a review of your cycle, skin, weight and mood.

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