PCOS symptoms ultrasound explained

Overview

PCOS stands for polycystic ovary syndrome. It is a common hormonal condition that affects the way the ovaries work. The name sounds alarming, but 'polycystic' simply means 'many small sacs'. On an ultrasound scan, the ovaries can be seen to contain many small follicles (immature eggs), which collect like a string of pearls. These are not harmful cysts. PCOS changes the balance of hormones and can affect periods, skin, hair, weight, and fertility.

Yes. PCOS is one of the most common hormonal conditions, affecting an estimated 1 in 10 women and people assigned female at birth in the UK and around the world.

PCOS affects women and people with ovaries. Symptoms often begin during the teenage years or early twenties, and the condition can be different for each person. People of every weight, ethnicity, and background can be affected.

Symptoms

Common symptoms

• Irregular, infrequent, or missing periods (often fewer than 8 periods a year)
• Signs of higher androgen levels, such as excess facial or body hair (doctors call this hirsutism), acne, or thinning scalp hair
• Difficulty getting pregnant, due to irregular ovulation
• Weight gain that is hard to explain, or trouble losing weight
• Ultrasound finding of one or both ovaries with many small follicles

Symptoms in children

• For teenagers, PCOS may first appear as periods that do not come regularly, acne that is difficult to treat, excess body hair, or weight gain.
• Many of these signs are also normal during puberty, so a diagnosis is usually made over time, after other causes have been ruled out.

Symptoms in older adults

• After menopause, the symptoms tied to hormone cycles — like irregular periods — naturally stop.
• But the metabolic effects of PCOS (higher risks of type 2 diabetes and heart problems) remain, so healthy lifestyle habits and regular blood tests continue to matter.

Causes

Main causes

• The exact cause of PCOS is not fully understood, but it often runs in families, which points to genetics.
• Many people with PCOS have insulin resistance: their cells do not respond normally to insulin, so the body produces extra insulin, which can push the ovaries to make more androgens.
• Higher levels of androgens disrupt ovulation, which leads to irregular periods and the classic ultrasound picture of follicles lining up in the ovaries.

Risk factors

• A close family member (mother, sister) with PCOS or type 2 diabetes
• Being overweight or living with obesity can make insulin resistance and symptoms worse, though PCOS also affects people at a healthy weight
• Having insulin resistance or pre-diabetes

When to see a doctor

See a doctor urgently if:

• Sudden or severe pelvic pain, especially with fever, vomiting, or faintness — call your local emergency number or go to urgent care
• Heavy bleeding that keeps you from daily life or soaks through protection quickly — get same-day medical advice

Book a routine appointment if:

• Your periods are irregular, missing, or very heavy most months
• You have acne or excess hair that bothers you
• You have been trying to conceive for a year (or six months if over 35) without success
• You are gaining weight without a clear reason

Diagnosis

Doctors usually diagnose PCOS using what is called the Rotterdam criteria. You need to have at least two of the following three findings: 1) Periods that are irregular, infrequent, or absent (a sign that ovulation is not happening regularly). 2) Physical signs or blood-test evidence of higher-than-normal androgen hormones. 3) An ultrasound scan reporting polycystic ovaries — meaning at least one ovary has 20 or more follicles, or is enlarged. Your doctor will also rule out other conditions that can cause similar symptoms, such as thyroid problems or high prolactin.

Tests that may be done

• A detailed chat about your periods, symptoms, and family history
• Blood tests to measure hormone levels (including testosterone), and often fasted glucose and cholesterol
• A pelvic ultrasound scan — transvaginal (a small probe inside the vagina gives the clearest view) or abdominal (over your belly)
• A physical examination, including blood pressure measurement

What to expect at your appointment

The ultrasound is usually arranged by your doctor or a specialist clinic. It is quick — roughly 15 to 30 minutes — and does not hurt. For the transvaginal scan you will lie on your back with your knees bent; a slim, lubricated probe is gently inserted into the vagina. For an abdominal scan, the ultrasound technician will slide a probe over your lower belly, and you may be asked to arrive with a full bladder. The operator counts the follicles and measures the size of your ovaries. You may not hear the result at the scan; the report goes to your doctor, who explains what it means and how it fits with your symptoms.

Treatment

There is no cure for PCOS, but it is very treatable. The right plan depends on your priorities: regulating periods, improving skin and hair, supporting fertility, or reducing long-term health risks. Your doctor should help you set realistic goals and review the plan over time.

Self-care at home

• Move your body regularly — aim for at least 30 minutes of moderate activity most days (about 150 minutes a week in total)
• Keep regular meal times and choose balanced meals with protein, fibre, and vegetables
• Get enough sleep and manage stress, as both affect hormones and blood sugar
• If you smoke, think about stopping; your pharmacist or practice nurse can help

Medical treatments

This is a general overview only — no treatment should be started without talking to your healthcare team. Hormonal contraception (for example the combined pill, patch, ring, or a hormonal coil) is commonly used to make periods regular and help with acne and excess hair. Medicines that improve how the body responds to insulin can encourage ovulation and improve metabolic health. If you are trying to conceive, doctors may suggest a medicine that stimulates the ovaries to release eggs, taken under specialist supervision. Androgen-lowering medicines can also help with hair and skin symptoms for some people. Your doctor will explain the expected benefits, risks, and side effects of any option they recommend.

When is surgery considered?

Surgery is rarely needed for PCOS. In specific situations — most often when fertility medicines have not worked — a specialist may offer a keyhole procedure called laparoscopic ovarian drilling, which creates tiny punctures in the ovary to lower androgen production and encourage ovulation. It is not a first-line treatment, and your specialist will explain why it might or might not be right for you.

Living with this condition

PCOS is a lifelong condition, but it does not define your life. Building gentle, consistent habits — tracking your cycles, eating well, moving regularly, taking any prescribed medicine — usually matters more than any single clinic appointment. Give yourself time; improvements build gradually.

Lifestyle tips

• Use a period tracker or calendar to spot patterns in your cycle length and symptoms
• Choose physical activities you genuinely enjoy, so you stay consistent
• Eat regular meals with protein and fibre at every meal to steady blood sugar
• Aim for a consistent bedtime, and avoid screens for an hour before sleep
• Limit ultra-processed foods and sugary drinks as much as you can — but allow yourself flexibility

Diet and exercise

There is no one-size-fits-all PCOS diet. The evidence generally backs a balanced, lower-glycaemic approach — plenty of vegetables, whole grains, legumes, fish, eggs, and lean meat, with limited added sugar. Combine it with regular activity. UK guidance recommends about 150 minutes of moderate exercise (such as brisk walking or cycling) per week, but any amount of movement is better than none. If weight loss is a goal, even losing 5% of your body weight can meaningfully improve ovulation and symptoms — but weight loss is not a requirement for deserving care or trying to conceive.

Mental health and emotional wellbeing

PCOS can affect confidence, body image, and mood, and the risk of anxiety and depression is higher than average. This is understandable — living with visible symptoms like hair and acne, or fertility worries, is genuinely hard. If you are struggling, please talk to your doctor. Mental health support (counselling or talking therapies) can be very helpful. If you ever feel that you might harm yourself, please do not wait — contact a mental health crisis line in your country, or call your local emergency number.

Prevention

PCOS itself cannot be prevented — it has a strong genetic component, and the hormonal pattern establishes early in life. However, many of its long-term complications, including type 2 diabetes, high blood pressure, and unhealthy cholesterol, can be meaningfully reduced with a balanced diet, regular activity, and maintaining a healthy weight if needed.

Screening programmes

If you have PCOS, many doctors recommend regular checks of your blood pressure, cholesterol, fasting blood sugar, and sometimes HbA1c (a longer-term glucose marker). The usual starting point is once a year or as advised by your doctor, particularly if you have other risk factors.

Complications

If left untreated

• Type 2 diabetes
• High blood pressure and high cholesterol (cardiovascular risk)
• Sleep apnoea (breathing pauses during sleep linked to heavier snoring and fatigue)
• A thickened womb lining (endometrial hyperplasia) if you have very few periods year after year — this can carry a cancer risk
• Anxiety and depression
• Fertility difficulties (though many people conceive)

Long-term outlook

It is important to hold two facts at once: PCOS is a lifelong condition, and its outlook is genuinely good. With routine medical care, healthy habits, and the right support, most people with PCOS manage their symptoms well and protect their long-term health. Many people conceive without help, and many others do so with fertility treatment. You deserve care, and good care is available.

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