Premature ovarian insufficiency (POI) affects women who experience a loss of normal ovarian function before the age of 40. This can have a significant impact on physical health, emotional wellbeing, fertility, and long-term health. With the right assessment, support, and treatment, many of the effects can be managed effectively, and long-term health protected.
In this article
What is premature ovarian insufficiency (POI)?
Premature ovarian insufficiency (POI) occurs when ovarian function declines before the age of 40. POI affects around 2 to 4 percent of women under 40:
- Around 2 to 4 in 100 under 40
- Around 1 in 1,000 under 30
Emotional and psychological impact
An early diagnosis can bring feelings of grief, loss, shock, anger, or uncertainty about identity and the future.
Support is just as important as medical treatment.
Many women benefit from
- Space to process the diagnosis
- Understanding how hormones affect mood and emotional regulation
- Practical strategies to support confidence, energy, and wellbeing
Fertility considerations
Fertility concerns are often one of the most distressing aspects of POI.
- Spontaneous ovulation and pregnancy can still occur in POI, although this is unpredictable
- Fertility preservation or assisted reproductive options may be appropriate
- In some cases, the right HRT regime can support conditions for successful IVF
- Emotional support and counselling can be invaluable
We take a sensitive, supportive approach to these conversations and can help guide next steps or referrals if needed.
Hormone replacement therapy (HRT)
For most women with POI, HRT is strongly recommended unless there is a medical reason not to use it.
HRT in this context is considered hormone replacement, not symptom treatment alone. The aim is to replace hormones the body would naturally be producing until at least the average age of menopause (around 51).
Benefits include
- Symptom relief
- Protection of bone and heart health
- Support for cognitive and emotional wellbeing
Guidance suggests that higher or different dosing may be needed compared to women who experience menopause later in life, and treatment should be individualised and reviewed regularly.
You can read more about how HRT works in our About HRT article.
Why diagnosis and treatment matter
POI is not just about symptoms.
Oestrogen plays a crucial role in long-term health, including
- Bone health and fracture prevention
- Cardiovascular health
- Cognitive health
- Muscle strength and joint health
- Urogenital and sexual health
Without appropriate treatment, women with POI are at increased risk of osteoporosis and cardiovascular disease.
Causes of POI
In many cases, no clear cause is identified.
Possible contributing factors include
- Genetic factors
- Autoimmune conditions
- Medical treatments such as chemotherapy or radiotherapy
- Surgery involving the ovaries
- Certain chromosomal conditions
- Viral or metabolic causes (rare)
You can read more about ovary-removal surgery in our Surgical menopause article.
Symptoms of POI
Symptoms are similar to those experienced during perimenopause and menopause.
Symptoms may include
- Irregular or absent periods
- Hot flushes and night sweats
- Sleep disturbance
- Mood changes, anxiety, or low mood
- Brain fog, poor concentration, or memory difficulties
- Vaginal dryness or discomfort
- Reduced libido
- Fatigue and low energy
Read more about brain fog and why it happens in our Brain fog and menopause article.
Our approach
We offer specialist, individualised care that considers:
- Your symptoms and medical history
- Long-term health protection
- Emotional wellbeing and life context
- Fertility concerns where relevant
- Lifestyle factors including stress, sleep, nutrition, and movement
Our aim is not just symptom control, but helping you feel supported, informed, and confident in your care.
When to seek medical advice
You should seek assessment if you:
- Have irregular periods with menopausal symptoms under 40
- Experience menopausal symptoms after cancer treatment or ovarian surgery
Helpful resources
- British Menopause Society (BMS)
- Daisy Network (support for POI)
- NICE menopause guidance
- Surgical menopause
- About HRT
Frequently asked questions
What is premature ovarian insufficiency (POI)?
Premature ovarian insufficiency (POI) is a condition where ovarian function declines before the age of 40. Ovarian activity may fluctuate, periods may stop and start, and ovulation can occasionally still occur.
Do I still need contraception with POI?
Yes. Ovulation can still occur intermittently, even if periods are irregular or absent, so contraception is recommended until the age of 55. We can help discuss suitable contraception alongside HRT if needed.
Can you still get pregnant with POI?
Yes. Pregnancy can still occur in POI, although it is unpredictable. Referrals to a fertility clinic are often required for expert input with this.
How long should I take HRT for?
HRT is usually recommended until at least the average age of natural menopause, around 51. Continuing beyond this may be beneficial and can be discussed and reviewed on an individual basis.
Will I need a higher dose of HRT?
Many women with POI require higher doses of oestrogen than those who experience menopause later in life.
Is HRT safe in POI?
For the majority of women, the benefits of HRT far outweigh risks when started at a younger age. Treatment is individualised and reviewed regularly in line with current guidance.
Should I take HRT if I have POI?
For most women who experience POI, HRT is recommended unless there is a medical reason not to. HRT is replacing hormones the body would normally produce until the average age of menopause, around 51, and is important for long-term health as well as symptom control. This is different to women going through menopause at 45+, when HRT is recommended where symptom control is required, not for future health protection alone.
What are the symptoms of POI?
Symptoms can include irregular or absent periods, hot flushes and night sweats, sleep disturbance, low mood or anxiety, brain fog or memory changes, vaginal dryness or discomfort, reduced libido, and fatigue.
How is POI diagnosed?
POI is diagnosed based on symptoms, menstrual history, and blood tests showing raised follicle stimulating hormone (FSH) levels. Further tests may be needed to assess possible causes or associated conditions.
What is the difference between early menopause and POI?
Early menopause occurs between 40 and 45. POI occurs under 40.
Does POI affect bone health?
Yes. Loss of oestrogen at a younger age increases the risk of osteoporosis. HRT plays a key role in protecting bone health, alongside lifestyle measures such as weight-bearing exercise and adequate calcium and vitamin D intake. A baseline DEXA scan is often recommended.
Does POI affect heart health?
Yes. Early loss of oestrogen is associated with an increased long-term risk of cardiovascular disease. Hormone replacement, alongside addressing blood pressure, cholesterol, activity levels, and stress, helps reduce this risk.
Can lifestyle changes help manage POI?
Lifestyle measures can support wellbeing and work alongside medical treatment. These include supporting sleep and stress, regular movement and strength-based exercise, balanced nutrition, and reducing smoking and excess alcohol. Lifestyle changes alone cannot replace oestrogen but are an important part of holistic care.
How can POI affect mood and mental health?
Hormonal changes can affect mood, anxiety, concentration, and emotional regulation. There may also be emotional responses such as grief or loss related to the diagnosis itself. Support may include HRT, psychological support, and wellbeing strategies.
When should I seek specialist advice?
You should seek assessment if menopausal symptoms occur under 40, symptoms are not well controlled, or you have concerns about fertility or long-term health.
POI can feel overwhelming.
At Manchester Menopause Hive, we have experience supporting women with POI and complex symptom presentations. If this page has resonated with you, a specialist conversation can be a helpful next step.
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