Premature Ovarian Insufficiency (POI)

Premature ovarian insufficiency (POI)

This is not medical advice — it is general information based on what you searched for that may help.

General information based on published sources and the symptoms you searched for. This isn't medical or legal advice, a diagnosis or a treatment plan. Please consult a doctor about your own symptoms. If your symptoms are severe or sudden, seek urgent care.

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POI applies specifically to people under age 40; standard midlife STRAW+10 cycle rules do not diagnose POI

Premature ovarian insufficiency (POI) occurs when ovarian function declines before age 40, causing infrequent or absent periods (oligomenorrhoea or amenorrhoea) and low estrogen levels. Because POI happens years before the average age of natural menopause, both diagnosis and treatment follow specialist rules that differ from standard midlife perimenopause guidance.

How clinicians diagnose POI (unlike menopause at 45+)

Whereas NICE guideline NG23 advises against routine hormone blood tests at age 45 and over, under age 40 laboratory testing is essential. Clinicians assess both your menstrual history (such as 4 or more months of absent or irregular periods) and elevated follicle-stimulating hormone (FSH) levels on two blood samples taken weeks apart, while ruling out pregnancy and other endocrine causes. Read more in Is there a blood test for perimenopause?.

Protecting bone, heart, and symptom health

Without hormone replacement, years of early estrogen deficiency increase the risk of rapid bone mineral loss (osteoporosis) and cardiovascular disease. Unless there is a specific medical contraindication (such as a hormone-sensitive cancer), guidelines recommend continuing hormone replacement at least until the average age of natural menopause. Check our Does It Work? evidence directory for what trial evidence says about exercise and non-hormonal support alongside medical care.

Emotional support and when to get help now

Being told in your 20s or 30s that your ovaries are not working normally — especially when fertility is affected — can feel overwhelming. Ask your clinician for a referral to a specialist POI clinic and psychological support.

Questions to take to your appointment

You can customize and print these prompts in our treatment conversation builder:

Could my missed periods and symptoms be signs of premature ovarian insufficiency, and when should we schedule the two FSH blood tests?
What hormone replacement options (transdermal HRT vs combined hormonal contraception) best protect my bones and cardiovascular health, and how do they differ if I need contraception?
Should we arrange a baseline DEXA bone density scan and a referral to a menopause or reproductive endocrinology specialist?

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Questions people ask

Why is hormone therapy viewed differently in POI (under 40) than in menopause after 50?

Under age 40, hormone therapy (or combined hormonal contraception) replaces estrogen that the ovaries would normally produce until the average age of natural menopause, helping protect long-term bone mineral density and cardiovascular health unless medically contraindicated.

Can you still ovulate or get pregnant with premature ovarian insufficiency?

Unlike natural menopause after 50, ovarian activity in POI can be intermittent. Spontaneous ovulation and pregnancy can occasionally occur, so discuss contraception or fertility specialist referral with your clinician.

References

Menopause: identification and management (NG23). National Institute for Health and Care Excellence (UK), 2026.

Menopause: identification and management (NG23), Recommendations. National Institute for Health and Care Excellence (UK), 2026.

The 2022 Hormone Therapy Position Statement Advisory Panel. The 2022 hormone therapy position statement of The North American Menopause Society. Menopause (The North American Menopause Society, now The Menopause Society), 2022. Funding: Funded by donations to the NAMS Education & Research Fund; the statement reports no commercial support. Individual panel disclosures not yet reviewed..

988 Suicide & Crisis Lifeline. 988 Lifeline, 2026.

Contact Samaritans. Samaritans, 2026.