Menopause and Bone Loss: Why It Accelerates and What to Do

Why does oestrogen loss cause bones to weaken so quickly?

Oestrogen is one of the main brakes on bone breakdown — and when it drops at menopause, that brake comes off. Your skeleton is constantly remodelled: cells called osteoclasts break old bone down, and osteoblasts build new bone up. Oestrogen keeps these two in balance, partly by limiting how long bone-resorbing cells survive.

The mechanism is well described. Laboratory research has shown that oestrogen directly triggers the death (apoptosis) of bone-resorbing osteoclasts, reining in resorption. When oestrogen falls, those cells live and work longer: reviews of post-menopausal bone biology describe increased osteoclast activity alongside reduced bone formation, so breakdown outpaces rebuilding.

The result, in the NHS's words, is that after menopause "oestrogen levels fall," which can lead to a rapid decrease in bone density. That imbalance is the engine behind menopause-related bone loss.

When does menopause-related bone loss actually begin — and does it start before your periods stop?

It usually starts before your last period — not after. This catches many women out, because they assume bone loss is a "post-menopausal" problem that begins once periods have stopped for good.

Detailed cohort research on the menopause transition shows that bone mineral density begins to decline around one year before the final menstrual period, with a marker of bone resorption rising about two years before that final period and peaking roughly a year and a half afterwards. In other words, the skeleton is already losing ground while periods are still happening, if increasingly erratic.

A separate review of the perimenopause reaches the same conclusion: bone loss accelerates dramatically during late perimenopause. The practical message is simple — perimenopause, not just post-menopause, is when the clock starts.

How much bone density can you lose during the menopause transition, and which sites are most at risk?

The spine and hip take the biggest hit, and the loss can be steep during the rapid phase. During the menopause transition, studies have measured spine and hip bone density falling year on year, with the spine generally losing fastest.

In one well-known analysis, White women lost around 2.5% per year at the lumbar spine and 1.8% per year at the femoral neck during the rapid transmenopause phase (these specific rates were reported for White women, so they should not be read as identical across all ethnic groups). A perimenopause review reported similar figures — around 1.8–2.3% per year at the spine and 1.0–1.4% at the hip, with spine loss reaching about 3.3% per year in the two years immediately after the final period before easing off.

Added up across the whole transition, patient-education guidance from the Endocrine Society estimates that up to 20% of bone loss can happen during these stages. That is why the 2024 UK clinical guideline reports that approximately one in two women (and one in five men) will sustain one or more fragility fractures in their lifetime.

Who is most at risk of significant bone loss — and what makes some women lose bone faster than others?

Some women lose bone faster, and certain factors raise the stakes. The biggest single driver is how much oestrogen exposure you lose and when.

Risk is higher if you go through menopause early. The NHS specifically flags early menopause before the age of 45, and having your ovaries removed before 45 as factors that can lead to lower bone density, because they shorten lifetime oestrogen exposure. Body weight matters too: perimenopause research found the rate of bone loss was 35–55% higher in the women with the lowest body weight, so being very lean is a disadvantage for bone.

Low vitamin D is another flag — in the menopause-transition cohort, a serum vitamin D below 20 ng/mL was associated with an 85% higher hazard of non-traumatic fracture. Family history, smoking, heavy alcohol use and some long-term medications add further risk. None of these can be read in the mirror, which is exactly why measuring matters.

What can you do to protect your bones during and after menopause? (exercise, diet, supplements)

Exercise is the standout lever you fully control — but it works alongside diet, not instead of it. The right kind of training loads bone and muscle hard enough to signal the skeleton to hold onto density.

A 2025 review of postmenopausal exercise found that supervised high-intensity resistance and impact training (HiRIT) improved spine bone density by roughly 2–4% across trials such as LIFTMOR and MEDEX-OP, and was associated with around a 23% reduction in the rate of falls — with the LIFTMOR programme not precipitating new or progressive vertebral fractures when properly supervised. Falls matter because most fragility fractures happen when bone loss and a fall coincide.

In practice, the protective toolkit is:

• Resistance training — progressive weights or bands two to three times a week, ideally with qualified supervision if you are new to it.
• Weight-bearing and impact activity — brisk walking, stairs, dancing, hopping where safe.
• Enough protein to defend muscle, which works hand in hand with bone.
• Calcium and vitamin D sufficiency — vitamin D shortfalls are linked to higher fracture risk in the menopause data above.
• A baseline bone scan so your effort is measured against a real number, not guesswork.

Does HRT help with bone loss, and who should consider it?

Hormone replacement therapy directly addresses the cause — falling oestrogen — and the bone evidence is consistent. Because oestrogen is the missing brake on bone breakdown, replacing it slows that loss.

A 2025 systematic review found that HRT raised bone density by about 3.2% at the lumbar spine and 2.9% at the hip, with oestrogen-only HRT associated with reduced hip and vertebral fracture risk; crucially, it also found that bone density declined significantly after HRT was discontinued. The 2024 UK clinical guideline reflects this, recommending HRT as a first-line treatment option in younger postmenopausal women (age 60 or under) with high fracture risk and a low baseline risk of adverse events.

How do you find out where your bones stand? (DEXA, REMS, and the FRAX risk checker in the UK)

You cannot feel bone loss — there are no symptoms until a fracture — so the only way to know is to measure. Three tools work together in the UK.

A risk calculator estimates your fracture probability from factors like age, weight and history; the 2024 UK guideline endorses a case-finding strategy — identifying higher-risk people for assessment rather than scanning everyone. A bone density scan then measures the actual numbers.

DEXA is the long-standing scan and uses a small dose of X-ray radiation. REMS (Radiofrequency Echographic Multi Spectrometry) is radiation-free, which makes it well suited to checking in repeatedly through and after the menopause transition — exactly the window when bone is changing fastest. Because it uses no ionising radiation, a REMS scan can be repeated safely to track whether your density is holding or falling.

There is no routine bone check built into standard menopause care, so for many women a baseline scan is the first time they learn where they stand. You can book a radiation-free bone health assessment, read more about our bone health assessment and BioDensity scan, or see where we screen across the UK.

What happens if bone loss is already significant — what treatments are available?

If a scan shows significant loss or osteoporosis, it is treatable — and knowing early gives you the most options. Diagnosis usually combines your fracture-risk assessment with bone density, after which your GP or a specialist can discuss treatment.

For higher-risk women, the 2024 UK clinical guideline supports identifying and treating those at risk through a structured assessment pathway, with HRT a first-line option for some younger postmenopausal women and other bone-protective medicines available where appropriate. The context for taking it seriously is stark: the same guideline reports around 549,000 new fragility fractures each year in the UK, including 105,000 hip fractures, costing the NHS more than £4.7 billion a year.

The encouragement is this: the earlier you measure, the more of your bone you can protect — and the more of those treatment options remain genuinely preventive rather than reactive.

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This article is part of our menopause and bone health series. If you are also weighing up weight-loss injections, see our guide on Ozempic and bone loss, and explore the science behind our approach.