Most women expect menopause somewhere in their mid to late 40s. So when periods become irregular or stop in your 30s or early 40s, it can come as a shock. Early menopause is more common than many people realise, and it deserves proper medical attention, not just because of the symptoms, but because of what lower hormone levels mean for your long-term health. This guide explains the early menopause signs to look out for, the main causes, how it is tested and why treatment matters.
Early menopause and POI: what do the terms mean?
- Early menopause is when periods stop before the age of 45.
- Premature ovarian insufficiency (POI), also called premature menopause, is when the ovaries stop working normally before the age of 40.
“Insufficiency” is used because, in POI, the ovaries do not always stop completely. Some women with POI have occasional periods, and a small number can still become pregnant. This is one reason why a proper diagnosis matters.
For comparison, the average age of natural menopause for Indian women is about 46 years, according to an Indian Menopause Society survey. You can read more in our article on menopause age in India.
How common is it?
An international guideline on POI published in 2024 by ESHRE and other societies, including the International Menopause Society, estimates that around 3.5% of women develop POI, higher than was previously thought. In India, an analysis of the National Family Health Survey (2019–21) estimated that about 2.2% of women under 40 had experienced premature menopause, and about 16.2% of women aged 40 to 44 had experienced early menopause.
In other words, if this is happening to you, you are far from alone.
Early menopause signs to look out for
The signs of early menopause are much the same as those of menopause at any age. The difference is that they appear sooner, and women and doctors sometimes put them down to stress or a busy life.
Changes in your periods
- Periods that become irregular, lighter or much further apart
- Periods that stop for four months or more (if you are not pregnant)
- Periods that stop after stopping the contraceptive pill and do not come back
Hot flashes and night sweats
Sudden waves of heat, flushing and sweating, by day or at night. See our guide to hot flashes.
Sleep, mood and memory changes
- Waking during the night and feeling tired all day
- Anxiety, low mood, irritability or feeling overwhelmed
- Poor concentration and forgetfulness, often called brain fog
Physical changes
- Vaginal dryness, discomfort during sex and lower sex drive
- Needing to pass urine more often
- Joint aches, dry skin and hair changes
- Difficulty getting pregnant
For a fuller list, see our A to Z of menopause symptoms. If you are in your early 40s and your periods are only changing, our guide to menopause signs at 40 may also help.
What causes early menopause?
Sometimes the cause is clear. Often it is not. According to an International Menopause Society white paper, no cause is found in 70–90% of women diagnosed with POI. The known causes include:
1. Surgery
Removing both ovaries (bilateral oophorectomy), for example during a hysterectomy or for endometriosis or cancer risk, causes immediate menopause. A hysterectomy that leaves the ovaries in place stops periods but is not the same as menopause, although some women may go on to have an earlier menopause afterwards.
2. Chemotherapy and radiotherapy
Cancer treatments, especially some types of chemotherapy and radiotherapy to the pelvis, can damage the ovaries. Menopause may happen during treatment, soon after, or some years later. NuHer co-founder Lisa Ray has spoken openly about this: “At 37, cancer treatment pushed my body into menopause overnight.” You can read more about NuHer and its founders.
3. Autoimmune conditions
In autoimmune conditions, the immune system attacks the body's own tissues, and sometimes this includes the ovaries. POI is linked with conditions such as autoimmune thyroid disease and Addison's disease. The IMS white paper reports that spontaneous POI is associated with autoimmune disease in between 4% and 30% of cases.
4. Genetic causes
Some genetic conditions affect the ovaries. These include Turner syndrome, where all or part of one X chromosome is missing, and the fragile X premutation, which carries about a 20% chance of POI. The 2024 international guideline recommends testing for the fragile X premutation in all women diagnosed with POI.
5. Family history
Early menopause can run in families. If your mother or sister had an early menopause, let your doctor know.
6. Lifestyle factors
Smoking is linked with an earlier menopause. In India, the NFHS-5 analysis also linked lower education, poorer economic conditions, smoking, frequent fried food and early first periods with premature and early menopause.
How is early menopause tested?
Testing is based on your age, your symptoms and your periods. The NICE menopause guideline (NG23), used widely by doctors, recommends:
| Your age | What NICE recommends |
|---|---|
| Under 40 | POI is diagnosed from menopause symptoms, including no or infrequent periods, plus raised FSH (follicle-stimulating hormone) levels on two blood samples taken 4 to 6 weeks apart. It should not be diagnosed from a single blood test. |
| 40 to 45 | An FSH blood test may be considered if you have menopause symptoms, including a change in your periods. |
| Over 45 | Perimenopause and menopause can usually be identified from symptoms alone, without blood tests. |
NICE also advises against routinely using the AMH (anti-Müllerian hormone) test to diagnose POI. The newer 2024 international guideline says that a single raised FSH level, together with at least four months of missing or irregular periods, can be enough in many cases, with repeat or AMH testing when the picture is unclear. Your doctor will also consider your medical and family history, and may suggest tests for thyroid function, pregnancy, prolactin, bone density or genetic causes.
Why treatment matters for your bones and heart
Estrogen helps keep bones strong and blood vessels healthy. When it falls years earlier than usual, these protective effects are lost sooner.
- Bones: early menopause raises the risk of osteoporosis and fractures. Read our article on menopause and osteoporosis.
- Heart: a 2019 analysis of more than 300,000 women in The Lancet Public Health found that, compared with menopause at 50 to 51, menopause before 40 was linked with a 55% higher risk of heart disease events, and menopause at 40 to 44 with a 30% higher risk.
- Brain and overall health: the IMS white paper notes that long-term low estrogen is linked with higher risks of cognitive impairment and stroke, and that untreated POI is linked with higher mortality.
This is why NICE recommends offering hormone treatment, either hormone replacement therapy (HRT) or a combined hormonal contraceptive, to women with POI unless there is a medical reason not to, such as a hormone-sensitive cancer. Treatment is usually continued at least until the average age of natural menopause. Importantly, NICE explains that for women under 40 the baseline risks of breast cancer and heart disease are very low, and that HRT is not a contraceptive.
Alongside medical treatment, weight-bearing exercise, enough calcium and vitamin D, not smoking and regular heart health checks all help. For general symptom support, some women also use MENOVITA, a supplement for hot flashes, night sweats, sleep and mood support. It does not replace hormone treatment where that is recommended.
Emotional support matters too
An early menopause can bring grief, especially if you had hoped to have children or more children. Feeling shocked, sad or angry is normal. Speaking with a doctor who understands early menopause, and with a counsellor if needed, can make a real difference. Our menopause care at NuHer looks at both physical and emotional wellbeing, and you can meet our gynaecologists, physicians and counsellors on our Our Doctors page.
Questions women ask
What are the first signs of early menopause?
Usually changes in your periods, such as irregular cycles or periods stopping for several months, along with hot flashes, night sweats, poor sleep or mood changes, appearing before the age of 45.
Can I get pregnant if I have POI?
It is less likely, but possible. The ovaries may still work occasionally, so a small number of women with POI do conceive naturally. If you do not want to get pregnant, use contraception, and talk to a fertility specialist if you do.
Does a hysterectomy cause menopause?
Only if both ovaries are removed. If your ovaries are left in place, your periods stop but your ovaries continue to make hormones, although menopause may come somewhat earlier.
Is HRT safe if I go through menopause early?
For most women with POI or early menopause, guidelines recommend hormone treatment at least until the usual age of menopause, because the benefits for bones and heart are significant and baseline risks at a young age are low. Your doctor will check whether it is right for you.
Will one blood test confirm early menopause?
Not always. Hormone levels can fluctuate, so NICE recommends two FSH tests 4 to 6 weeks apart for women under 40. Your doctor will look at your test results together with your symptoms and history.
If you are noticing early menopause signs, you do not have to wait and wonder. Take our free menopause test, or book a consultation with a NuHer doctor in person at Nariman Point, Mumbai, or by video from anywhere in India.
