Early Menopause and Bone Health: Why It Raises Osteoporosis Risk

Does early or premature menopause raise your risk of osteoporosis?

Yes — an early or premature menopause is a recognised osteoporosis risk factor, because your bones lose the protective effect of oestrogen sooner and for longer. Oestrogen helps keep bone density stable by slowing the natural breakdown of bone, so when it falls, bone loss speeds up.

The Royal Osteoporosis Society explains that with an early menopause "before 45 and especially before 40", the normal loss of bone density that happens at low oestrogen simply carries on for longer, increasing the risk of osteoporosis in later life. The Endocrine Society describes the underlying mechanism: because oestrogen slows the natural breakdown of bone, its reduction at menopause significantly speeds up bone loss — up to about 20% of bone loss can happen around these stages. Reach that point years earlier than average, and the skeleton spends more of your life under that accelerated loss.

The longer-term picture bears this out. In a 23-year longitudinal analysis, 49.7% of women with POI or early menopause had osteoporosis or a fracture, compared with 36.6% of women who reached menopause at the usual age — with POI/early menopause raising the odds of osteoporosis (OR 1.37, 95% CI 1.07–1.77) and of fracture (OR 1.45, 1.15–1.81). These are single-study figures, so read them as one strong signal rather than a fixed population rate, but the direction is clear and consistent with the biology. For the wider picture of how the menopause transition affects the skeleton, see our guide to menopause and bone loss.

What counts as early menopause versus premature ovarian insufficiency (POI)?

The two are defined simply by age: early menopause is when periods stop before 45, and premature menopause — or premature ovarian insufficiency — is before 40. The NHS defines early menopause as periods stopping before the age of 45, and premature menopause as before 40, and notes that before 45 there is a higher chance of problems with the bones (osteoporosis) and the heart. A Leeds Teaching Hospitals NHS Trust patient resource uses the same thresholds — menopause under 45 is early and under 40 is premature — and explains that a lack of oestrogen over several years can lead to osteoporosis.

The point of the labels is not the terminology but the timing: the earlier oestrogen falls away, the more years your bones spend without it.

Why does surgical menopause (having your ovaries removed) affect bones?

Removing both ovaries is a recognised cause of early or premature menopause, and it drops oestrogen abruptly rather than gradually — so the bone impact can be more sudden. The NHS lists surgery to remove the ovaries among the causes of early or premature menopause, and the Leeds NHS resource likewise names surgical removal of the ovaries as a cause.

Where natural menopause is a gradual decline, surgical menopause removes the ovarian oestrogen supply at once. Because oestrogen slows the natural breakdown of bone, losing it speeds up bone loss — so an abrupt fall means the accelerated-loss phase can begin immediately. No single source we opened states "surgical menopause causes rapid bone loss" in exactly those words, so treat this as a mechanistic explanation rather than a quoted finding. If you have had, or are considering, surgery to remove your ovaries, it is worth discussing bone protection with your clinician in advance.

How much impaired bone health is already present at diagnosis?

Often more than you would expect — many women already have low bone density by the time an early menopause or POI is diagnosed, and delays make it worse. This is what makes the condition easy to miss: bone loss is silent, with no symptoms until a fracture.

In one cohort, at the point of POI or early-menopause diagnosis, 43.1% of women already had osteopenia and 10.3% had osteoporosis — meaning only 46.6% had normal bone density — and a longer delay to diagnosis correlated with lower bone density at the lumbar spine. Again, this is a single cohort rather than a universal figure, but it underlines a practical message: the sooner the situation is recognised and bone is assessed, the more of it can be protected.

Can HRT protect my bones if I have early menopause or POI?

Generally, yes — for early menopause and POI, replacing oestrogen is usually recommended until around the normal age of menopause, partly to protect bone, unless there is a medical reason not to. This is a different calculation from HRT started for symptoms at the usual menopausal age, because here it is largely restoring hormones the body would ordinarily still be producing.

The NHS notes that HRT or the combined contraceptive pill is used to replace the missing hormones in early or premature menopause. The Leeds NHS resource is more specific on duration: HRT is recommended until at least the average age of menopause, which is 51 years in the UK. A 2018 review in Menopause Review similarly advises that HRT should be started at recognition of POI and continued at least to the age of natural menopause, and that sex-steroid replacement restores bone density in young patients. And in the long-term analysis above, menopausal hormone therapy taken before or at study entry was protective, with lower odds of osteoporosis or fracture (OR 0.65, 95% CI 0.45–0.96).

The Royal Osteoporosis Society adds that HRT taken for menopausal symptoms also protects bone. Whether HRT is right for you depends on your history and any contraindications, so this is a decision to make individually with a clinician. We look at the hormone side in more depth in our guide to oestrogen, HRT and bone density.

What else helps protect bone health after an early menopause?

Alongside HRT where appropriate, the everyday levers are exercise, adequate calcium and vitamin D, and not smoking. These do not replace lost oestrogen, but they support the skeleton through the years it is most vulnerable.

The Endocrine Society highlights calcium and vitamin D, resistance, balance and weight-bearing exercise, and avoiding smoking as ways to help reduce bone loss. On nutrients specifically, the 2018 Menopause Review noted that 1200 mg of calcium and 800–1000 IU of vitamin D per day is recommended in addition to hormonal replacement in women with POI — treat that as general information from one review, not a dose to self-prescribe, and confirm your own needs with a clinician, as UK sources may frame the amounts differently. For a fuller routine, see our guide on how to prevent osteoporosis after menopause.

Should you have a bone-density scan if you've had an early or premature menopause?

A bone-density baseline is worth establishing after an early or premature menopause — it captures your starting point so any change can be monitored over time. Because bone loss is silent, the only way to know where you stand is to measure it, and the Leeds NHS resource notes that bone strength (density) can be measured with a special scan.

The case for measuring early is strong given how often low bone density is already present at diagnosis, and how longer diagnostic delays track with lower bone density. A baseline answers the question that matters most: is my bone density holding, or falling, and do I need to act?

REMS (Radiofrequency Echographic Multi Spectrometry) is a radiation-free way to establish that baseline and monitor bone health over the years that follow — which suits repeat checks through the long window after an early menopause. It complements, rather than replaces, care from your GP or specialist. You can read more about our bone health assessment or book a radiation-free bone health assessment.

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This article is part of our bone health series. If you're navigating the wider transition, see our guide to menopause and bone loss.