Your Body

PCOS: what it actually is, and what genuinely helps

Polycystic ovary syndrome is a hormonal and metabolic condition affecting roughly one in ten women and people with ovaries. The name is genuinely unhelpful: the “cysts” are not cysts at all, they are ordinary egg-containing follicles that started developing and then stalled because ovulation did not happen, and you can have PCOS with completely normal-looking ovaries. What is actually going on is a loop between three things: ovulation that happens irregularly or not at all, slightly raised androgens such as testosterone, and, for many but not all people, insulin resistance. Once you can see the loop, the treatments make a lot more sense.

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Sound like you?

PCOS shows up differently in different people, which is part of why it gets missed for years.

📆Your periods are unpredictable, very far apart, or have stopped without an obvious reason.

🪒Acne, hair growing where you would rather it did not, or thinning at your temples.

⚖️Your weight has changed in a way that does not match what you are eating, or will not shift however carefully you try.

😔Anxiety or low mood that seems tangled up with all of it, because it often is.

💜PCOS is common, manageable, and not a verdict on your future. Most people with it who want children go on to have them.

How it is actually diagnosed

There is a proper set of criteria, and you need two out of three: irregular or absent ovulation (usually shown by irregular or missing periods), raised androgens (either visible, such as acne or excess hair, or on a blood test), and polycystic-looking ovaries on an ultrasound. Two out of three. That means you can be diagnosed without a scan, and a scan showing polycystic ovaries on its own does not mean you have PCOS. Other things that mimic it, thyroid problems, raised prolactin, and rarer hormone conditions, need excluding first, which is why the blood tests matter.

The insulin part nobody explains

For a large proportion of people with PCOS, cells respond poorly to insulin, so the body makes more of it to compensate. High insulin pushes the ovaries to produce more testosterone and lowers the protein that normally keeps testosterone bound and inactive. More free testosterone then further disrupts ovulation. That is the loop. It also explains why the symptoms respond to things that improve insulin sensitivity, and why it can be genuinely harder to lose weight with PCOS rather than a matter of willpower. Importantly, this happens in slim people with PCOS too.

Why the androgen symptoms happen

Acne along the jaw and chin, coarser hair on the face, chest or stomach, and thinning hair at the temples are all driven by raised androgens, not by hygiene, diet or anything you have done. They are also the symptoms that tend to affect people most and get taken least seriously. They are treatable, and asking for treatment for them specifically is completely reasonable, not vanity.

The mood side is part of the condition

Rates of anxiety and depression are meaningfully higher in PCOS, and it is not simply a reaction to the symptoms. Irregular cycles mean less of the progesterone that normally has a calming effect, insulin swings affect mood directly, and living with unpredictable periods, visible symptoms and fertility uncertainty is hard on its own. If your mood is struggling, that is a legitimate part of the conversation, not a separate problem to feel embarrassed about.

A diagnosis is a map, not a verdict. It tells you where you are, not how far you can go.

What to ask for, and what actually moves the needle

A mix of what to request medically and what genuinely helps day to day. None of this requires an overhaul of your life.

The tests worth requesting

Testosterone and SHBG, LH and FSH, prolactin, thyroid function, and HbA1c or a glucose tolerance test to look at insulin handling. A pelvic ultrasound if the picture is unclear. If you have been given a PCOS label without bloods, it is fair to ask for them, both to confirm it and to rule out the conditions that look similar.

Eat in a way that steadies insulin, not a diet

This is the intervention with the best evidence, and it is not about restriction. Pair carbohydrates with protein, fat or fibre rather than eating them alone, do not go long stretches on coffee and nothing, and build meals around something substantial. People often notice steadier energy and mood within a couple of weeks, well before anything else changes. Restrictive dieting tends to backfire in PCOS, partly because it raises cortisol, which makes the whole loop worse.

Resistance training, specifically

Any movement helps, but building muscle improves insulin sensitivity more than cardio does, and muscle keeps improving it between sessions. Two short strength sessions a week is enough to matter. Body weight at home counts. This is one of the few things that treats the underlying mechanism rather than the symptoms.

Medical treatments, by what they are for

For irregular periods and androgen symptoms: the combined pill is usually first line. For excess hair and acne: co-cyprindiol, spironolactone, or topical treatments, and hair-reduction treatments are legitimate. For insulin resistance: metformin. For trying to conceive: letrozole is now first-line ovulation induction, ahead of clomifene. Inositol supplements have some supporting evidence and are low risk, though the quality of studies varies, so treat it as maybe-helpful rather than essential.

The long-term things to keep an eye on

PCOS raises the risk of type 2 diabetes, so periodic glucose checks are sensible, and of high blood pressure and cholesterol. If you are having fewer than three or four periods a year, the womb lining can thicken without the regular shedding it normally gets, so it is worth asking your GP about protecting it, usually with a hormonal treatment. None of this is cause for alarm, it is just the monitoring that comes with the diagnosis, and knowing it means you can ask rather than hope someone remembers.

🧰Your PCOS tool kit

Verity The UK charity for PCOS. Reliable information, an online community, and the reassurance of people who have been through the same appointments.

The NHS PCOS pages Accurate, brief, and a good grounding before an appointment so you recognise the terms being used.

A three-month symptom and cycle log Period dates, skin, hair, mood, energy. It shows whether something is working, which matters because most PCOS treatments take two to three months to show an effect and it is easy to give up at week six.

A realistic first change Pick one: protein at breakfast, or two short strength sessions a week. One change held for three months beats five changes abandoned in a fortnight, and this condition rewards consistency more than intensity.

✨Try this: one appointment, three asks

PCOS appointments go better when you arrive with specifics, because the condition has several separate strands:

Write down your period dates for the last six months, or note that they have stopped.
List which strand bothers you most: irregular periods, skin and hair, weight and energy, mood, or fertility. Lead with that one.
Ask for the bloods by name: testosterone, SHBG, LH, FSH, prolactin, thyroid, HbA1c.
Ask one direct question about what bothers you most, for example: “What are my options for the hair growth?” or “If I want to try for a baby in the next year, what should I be doing now?”

Going deeper: PCOS is a metabolic condition with reproductive symptoms

The name is one of the most misleading in medicine. Understanding what is actually driving it changes which treatments make sense, and why the usual advice so often fails.

The name is wrong, and that matters

Polycystic ovary syndrome suggests a condition of cysts on the ovaries. What scans actually show is a larger than usual number of small immature follicles, each an egg that started developing and stalled. They are not cysts in the ordinary sense, they are not dangerous, and you can have PCOS with completely normal looking ovaries. You can also have the follicle appearance with no PCOS at all.

Diagnosis in the UK usually follows the Rotterdam criteria: two of three features are required. Irregular or absent ovulation, signs of raised androgens either on examination or on a blood test, and the polycystic ovary appearance on ultrasound. Two out of three means several quite different-looking people all hold the same diagnosis, which is why generic PCOS advice frequently misses.

Why PCOS looks so different from person to person, and why one-size advice tends to disappoint.

Insulin resistance, the engine underneath

For a large proportion of people with PCOS, the driver is insulin resistance. Insulin's job is to move glucose out of the blood and into cells. When cells respond sluggishly, the body compensates by producing more insulin, and blood insulin levels run high even while blood glucose looks unremarkable on a routine test.

High insulin does two things in the ovary. It pushes the ovary to produce more testosterone, and it lowers a carrier protein in the blood called sex hormone binding globulin, which normally keeps some testosterone bound and inactive. Less carrier protein means more free, active testosterone. That combination is what produces the recognisable cluster: acne along the jaw, hair growth on the face and body, thinning at the temples, and disrupted ovulation. This is also why the symptoms feed each other, and why treating insulin rather than only the skin and hair often shifts more.

Crucially, insulin resistance occurs in lean people with PCOS too. Being slim is not evidence against it, which is why lean PCOS is so often dismissed and so often undertreated.

The words worth knowing

Insulin resistance. Cells responding poorly to insulin, so more is produced. The central mechanism for many people with PCOS, and independent of body size.

Androgens. Hormones including testosterone, present in everyone. When raised, they drive acne, unwanted hair growth and scalp thinning, and they interfere with ovulation.

SHBG. Sex hormone binding globulin, the carrier protein that keeps some testosterone inactive. High insulin lowers it, so free testosterone rises even without dramatic total testosterone.

Anovulation. Cycles without ovulation. The reason for irregular or absent periods in PCOS, and the reason for reduced fertility, which is usually about timing and frequency of ovulation rather than an inability to conceive.

Metformin. A medication that improves insulin sensitivity. Used in PCOS precisely because the metabolic side is often the driver, not because of blood sugar alone.

Three things that cause real harm when got wrong

The beliefPCOS means I cannot have children.

Closer to the truthPCOS is one of the most common causes of reduced fertility and also one of the most treatable. Many people conceive without help, many with ovulation induction, and the problem is usually irregular ovulation rather than absent fertility. It also means contraception still matters if you do not want to conceive, because unpredictable does not mean impossible.

The beliefI just need to lose weight and it will resolve.

Closer to the truthInsulin resistance makes weight loss harder, so this advice hands you a task the condition itself has made more difficult and then treats the difficulty as a personal failing. Modest changes can meaningfully improve symptoms, but weight loss is not a cure, lean people get PCOS, and being told to come back lighter is not a treatment plan.

The beliefIt is a period problem, so once my periods are managed I am done.

Closer to the truthPCOS carries a raised long-term risk of type 2 diabetes, including during pregnancy, along with associations with cholesterol changes and with depression and anxiety. That is why periodic metabolic checks are part of proper care, and why asking about them is sensible rather than alarmist.

What genuinely helps, and what to ask for

Because insulin is central, the changes with the best return tend to be the ones that reduce insulin spikes rather than the ones that reduce calories hardest. Protein and fibre with every meal, carbohydrates eaten alongside protein and fat rather than alone, and walking after eating all reduce the insulin response to food. Resistance training makes muscle more insulin sensitive and does more here than long punishing cardio. Sleep matters more than it sounds: short sleep worsens insulin resistance directly, so a consistent bedtime is not a soft extra.

In an appointment, ask what your care should include rather than waiting to be offered it: a discussion of insulin resistance and whether metformin is relevant to you, whether treatment for skin and hair symptoms is available, how often your blood pressure, cholesterol and blood sugar should be checked, and what the plan would be if and when you want to conceive. If low mood or anxiety has come with it, say so in the same appointment. It is a recognised part of the condition, not a separate complaint, and treating it is part of treating PCOS properly.

Why this matters

A lot of people with PCOS spend years being told to lose weight, with no explanation of why it is harder, no acknowledgement that slim people get it too, and no treatment for the symptoms they actually mind. That is a demoralising place to live. Understanding the loop, ovulation, androgens, insulin, changes the story from personal failure to a mechanism with several points you can act on. It is a long-term condition, and it is one of the most treatable ones there is.

This is general information, not a diagnosis. PCOS is diagnosed against set criteria and only after ruling out conditions that look similar, so please see a GP rather than self-diagnosing from a list. See a GP if your periods have stopped for three months or more without an obvious reason, and note that pregnancy is still possible with irregular cycles, so contraception still matters if you do not want to conceive.

Understand it

PCOS is a common condition involving ovulation, higher androgen activity and, for many, insulin resistance. You do not need to have ovarian cysts to have PCOS, and no single symptom or test confirms it. Care should consider periods, fertility, metabolic health, skin and emotional wellbeing.

You might also notice:

Your periods are unpredictable, very far apart, or have stopped without an obvious reason.
Acne, hair growing where you would rather it did not, or thinning at your temples.
Your weight has changed in a way that does not match what you are eating, or will not shift however carefully you try.
Anxiety or low mood that seems tangled up with all of it, because it often is.
A gentle place to start: How it is actually diagnosed.
Another thing worth trying: The insulin part nobody explains.

In real life

Irregular cycles, acne or facial hair can affect confidence as well as physical health. Asking for both medical treatment and emotional support is reasonable; neither concern is superficial.

Other ways this can show up:

Your weight has changed in a way that does not match what you are eating, or will not shift however carefully you try.
Anxiety or low mood that seems tangled up with all of it, because it often is.
Your periods are unpredictable, very far apart, or have stopped without an obvious reason.
Acne, hair growing where you would rather it did not, or thinning at your temples.
One small thing to try: Why the androgen symptoms happen.
You might also try: The mood side is part of the condition.

Trusted next step: NHS PCOS guidance