Polycystic ovary syndrome (PCOS) is a long-term hormone and metabolic condition that can affect periods, ovulation, skin, hair, fertility, and health over time. Signs differ from person to person, and having ovarian cysts is not required. A clinician confirms PCOS by looking at a group of signs and ruling out other possible causes.
What is PCOS?
PCOS affects how the ovaries work and how the body handles some hormones. Androgens are hormones that everyone makes, but higher levels or stronger effects can be linked with increased facial or body hair, acne, scalp hair thinning, and changes in ovulation.
Metabolic health is also part of PCOS. “Metabolic” refers to how the body uses and stores energy. Some people with PCOS have insulin resistance, which means body cells do not respond to insulin as well as expected. Insulin helps move sugar from the blood into cells.
The World Health Organization estimates that PCOS affects 10% to 13% of women of reproductive age worldwide. The estimate can differ by population and by the criteria used.
Despite its name, PCOS is not simply a problem of “cysts.” The small follicles sometimes seen on an ultrasound are not the same as harmful ovarian cysts. Some people with PCOS do not have this ultrasound pattern at all.
What signs can PCOS cause?
Possible signs include:
- Periods that are irregular, infrequent, or absent.
- Difficulty knowing whether or when ovulation occurs.
- Increased facial or body hair.
- Acne or oily skin.
- Thinning hair on the scalp.
- Difficulty becoming pregnant.
- Heavy, long, or painful periods for some people.
- Changes linked with insulin resistance, such as darker, thicker patches of skin.
Not everyone has every sign. Symptoms may also change through adolescence, trying to conceive, pregnancy, and later life. The WHO notes that PCOS can affect emotional well-being as well as physical health.
Many of these signs have other possible causes. For example, irregular periods may occur in the first years after periods start, during perimenopause, with thyroid conditions, with major changes in energy intake or exercise, or because of some medicines. A symptom list cannot confirm PCOS.
How do clinicians assess PCOS?
A clinician will usually ask about your cycle, skin and hair changes, medicines, family history, pregnancy plans, and general health. They may check blood pressure and discuss blood tests. An ultrasound may be useful in some situations, but it is not always needed.
The WHO describes three main features used in assessment:
- Signs of higher androgen activity, seen in symptoms or blood results
- Irregular or absent periods linked with irregular ovulation
- A polycystic pattern on an ovarian ultrasound
In adults, PCOS may be confirmed when at least two features are present after other causes have been excluded. Assessment in teenagers needs extra care because irregular cycles and acne can be part of puberty. A clinician may use age-specific guidance rather than applying adult criteria too early.
An ultrasound result alone is not enough. In the same way, having regular periods does not always rule PCOS out. Your full history matters.
What care can involve
Care is based on the signs that matter to you, your health history, and whether pregnancy is a current goal. There is no single plan for everyone.
A clinician may discuss:
- Support for regular bleeding and protection of the uterine lining.
- Medicines that can help with acne or increased hair growth.
- Metformin in some situations to support metabolic health or ovulation.
- Fertility care when pregnancy is a goal.
- Support for sleep, mood, body image, or eating concerns.
- Checks for blood pressure, blood sugar, and cholesterol when appropriate.
No medicine is right for everyone. Some options are not suitable during pregnancy or when trying to conceive. Do not stop a prescribed medicine or begin a supplement because of an online article; discuss it with the clinician who knows your history.
Food, movement, sleep, and stress support may form part of care for overall health. This should not be reduced to blame or a demand to lose weight. ACOG and WHO both describe care as individual and linked to the person's goals.
PCOS and health over time
PCOS is linked with a higher chance of insulin resistance, type 2 diabetes, high blood pressure, sleep apnoea, and changes in the uterine lining. These are population links, not a forecast of what will happen to you. Your clinician can decide which checks fit your age, history, and symptoms.
Long gaps between periods can matter because the uterine lining may build up for longer. Tell a clinician if periods are very infrequent or have stopped. Do not wait for a fertility concern before asking about cycle health.
PCOS can also affect mood, self-esteem, and quality of life. Hair growth, acne, fertility worries, or weight stigma can be distressing. These concerns deserve the same respect as physical symptoms.
When to see a doctor
Book an appointment if periods are often irregular or absent, if new hair or skin changes concern you, or if you are having difficulty becoming pregnant. Also seek support if symptoms affect mood, eating, sleep, school, work, or relationships.
Bring a list of current medicines and a few months of period dates if you have them. Note acne, hair changes, bleeding, pain, and any family history of PCOS or type 2 diabetes. You can use the cycle-length calculator to summarise several logged cycles.
PCOS itself does not usually cause a sudden emergency. Urgent symptoms such as severe sudden pelvic pain, fainting, chest pain, or trouble breathing still need prompt medical help because another cause may be present.
Living with PCOS day to day
Choose goals that match your needs. One person may want more predictable bleeding, another may want support with acne, and another may be focused on pregnancy. It is reasonable for priorities to change.
Write down questions before an appointment. Ask what the clinician thinks is causing each symptom, which checks are being suggested, what each care option aims to change, and when progress will be reviewed.
Avoid comparing your body with before-and-after images or strict plans online. PCOS varies widely, and a plan that fits someone else may not fit your health, culture, budget, or goals.
How to track PCOS in Femio
Track period start and end dates, flow, symptoms, and short notes. Useful context might include acne changes, unwanted hair growth, scalp hair changes, sleep, mood, or when symptoms affect daily life. You choose what to record.
Femio can show cycle estimates as ranges and create a visit summary from your entries. A log can show timing and patterns, but it cannot confirm PCOS or choose clinical care.
Learn more about how the menstrual cycle works. Related guides cover common PCOS signs, how PCOS is assessed, and PCOS and fertility.
Frequently asked questions
Can you have PCOS without ovarian cysts?
Yes. The name can be misleading. A clinician can confirm PCOS without an ultrasound pattern when other criteria are met and other causes have been excluded.
Can you have regular periods and PCOS?
It is possible. Some people have signs of higher androgen activity or irregular ovulation even when bleeding seems regular. A clinician looks at the whole picture.
Does PCOS always cause fertility problems?
No. PCOS can affect ovulation, but fertility experiences vary. If pregnancy is a goal, a clinician can discuss timing, health checks, and care options that fit your situation.