Premature Ovarian Insufficiency (POI)

Menopause before 40 — diagnosis, treatment, and the unique considerations for younger women.

Key takeaways

POI affects 1% of women under 40 and 0.1% under 30 — it is NOT early menopause but a distinct condition
Unlike natural menopause, POI may have intermittent ovarian function — periods may restart unpredictably
HRT is strongly recommended for POI unless contraindicated — benefits clearly outweigh risks (NICE, ESHRE)
Fertility options should be discussed early — egg freezing and donor eggs are possibilities
POI increases long-term risks for osteoporosis and cardiovascular disease — proactive monitoring is essential

Premature Ovarian Insufficiency (POI), formerly called premature menopause, is a distinct condition with its own guidelines.

What is POI? It is the loss of ovarian function before age 40. It affects 1% of women under 40 and 0.1% under 30. Unlike natural menopause, ovarian function may be intermittent — some women resume periods and even conceive spontaneously.

Diagnosis: Two elevated FSH measurements (>25 IU/L) taken 4-6 weeks apart in a woman under 40 with oligo/amenorrhea for at least 4 months.

Treatment: NICE and ESHRE strongly recommend HRT for POI unless contraindicated — the benefits far outweigh the risks at this age. Hormone therapy should continue until the average age of natural menopause (around 51).

Fertility: Egg freezing should be discussed at diagnosis. Spontaneous pregnancy is possible but rare. Donor eggs with IVF are the most reliable fertility option.

Long-term health: Women with POI have higher risks of osteoporosis, cardiovascular disease, and cognitive decline. Regular bone density scans, cardiovascular monitoring, and lifelong HRT (until ~51) are recommended.

Sources

NICE NG23; ESHRE Guidelines; The Menopause Society

This content is strictly informational and does not substitute professional medical advice. Consult your doctor for any clinical decisions.

Back to guides

Premature Ovarian Insufficiency (POI)

Key takeaways

Sources

Related guides

What Is Perimenopause?

Stages of the Transition: From Perimenopause to Postmenopause

When to See a Doctor About Menopause