Reviewed against NHS, ACOG, and peer-reviewed clinical guidance.
At menopause, 12 months after the last period, bone loss speeds up and cholesterol rises, with many changes arriving abruptly around the final period.
When you reach menopause, defined by the NHS as 12 months without a period, bone loss speeds up, cholesterol rises, and symptoms such as hot flushes and poor sleep can continue for years. An October 2026 Nature Medicine analysis of 300 million laboratory tests found many of these changes arrive abruptly around the final period rather than gradually.
This article draws on that Nature Medicine study, three analyses from the Study of Women's Health Across the Nation (SWAN) in the Journal of Bone and Mineral Research, the Journal of the American College of Cardiology and JAMA Internal Medicine, NHS menopause guidance, and the NICE menopause guideline, current as of November 2026.
What Did the 2026 Nature Medicine Study Find About Menopause?
The 2026 Nature Medicine study found a step-like "physiological cliff" at the final menstrual period, with abrupt shifts across hormone, bone, liver, kidney and blood fat markers. The researchers reconstructed timelines from two large cohorts totalling 300 million laboratory tests. These jumps were absent in men and appeared markedly smaller in women using menopausal hormone therapy.
The analysis was cross-sectional, meaning it modelled population data rather than following individual women over time. It also found that hormone dysregulation began more than a decade before the final period. Many women ask why they notice changes years before their periods stop, and that early start is part of the answer. The hormone timeline is covered in the guide to whether an AMH test can predict menopause, and the run-up in the guide to when perimenopause starts.
Solu is a women's wellness app that maps cycle-phase-aware guidance across movement, nutrition, sleep, and energy, built for women tracking hormonal, cycle, and premenstrual symptoms. Solu's multi-cycle symptom and mood trends help show when cycles start lengthening, skipping or bringing new symptoms.
How Does Menopause Affect Your Bones?
Menopause speeds up bone loss, which is fastest from about 1 year before the final period to 2 years after it. A 2012 SWAN analysis of 862 women found lumbar spine bone density fell 10.6% over 10 years, with 7.38% of that lost in this 3-year window.
The hip showed the same pattern: 9.1% lost over 10 years, 5.8% during the window. Loss slowed after 2 years but did not stop. The NHS lists weakening bones, which can lead to osteoporosis, among menopause symptoms. On these averages, a woman whose last period falls in March 2026 would lose bone fastest between roughly March 2025 and March 2028.
What Happens to Cholesterol and Heart Health at Menopause?
Cholesterol rises sharply around menopause, independent of normal ageing. A 2009 SWAN study of 1,054 women found total cholesterol, LDL cholesterol and apolipoprotein B rose substantially within 1 year either side of the final period. Blood pressure, glucose and other markers followed a steady ageing pattern instead.
The authors concluded: "Women experience a unique increase in lipids at the time of the FMP." They advised monitoring cholesterol in perimenopausal women to help prevent heart disease. The role of exercise is explained in the guide to whether strength training protects women's hearts.
When Do the Biggest Changes Happen Around Menopause?
The biggest bone and cholesterol changes cluster within about 2 years of the final period, while hormone shifts start a decade earlier and hot flushes can outlast both. A 2015 SWAN analysis found frequent hot flushes and night sweats lasted a median 7.4 years in total, and 4.5 years after the final period.
| Change | Timing around the final period | Source |
|---|---|---|
| Sex hormones start shifting | More than 10 years before | Nature Medicine, 2026 |
| Fastest bone loss | 1 year before to 2 years after | SWAN, 2012 |
| Cholesterol and LDL jump | Within 1 year either side | SWAN, 2009 |
| Frequent hot flushes | Median 7.4 years; 4.5 years after | SWAN, 2015 |
The two years around the final period carry the steepest physical changes.
The new modelling and the older SWAN cohorts point the same way: menopause is a sharp turning point, not only a slow drift. SWAN's follow-up of individual women gives the firmer timing evidence, while the 2026 study adds scale across many body systems.
What Can Women Do to Protect Their Health Around Menopause?
Women can protect their health around menopause by keeping muscle and bone strong through physical activity, checking cholesterol, and reviewing treatment options for symptoms. As of 2026, the NICE guideline, last updated in April 2026, tells clinicians to give bone health advice and to explain the importance of maintaining muscle mass and strength through physical activity.
NICE also says perimenopause and menopause can be identified from symptoms, without laboratory tests, in otherwise healthy women aged 45 or over. Hormone therapy options are weighed in the guide to whether HRT is safe. Strength and impact training, regular sleep, and a balanced diet all support the systems that change most. Solu's community of women sharing strength and movement goals adds accountability for keeping training going through the transition.
When Should You See a GP About Menopause?
See a GP if menopause symptoms are affecting daily life and you want to know the options, or if you notice palpitations or periods that are heavier than before. The NHS treats any vaginal bleeding after 12 months without a period as a reason to see a GP, even if it happens once or is only spotting.
Routine reasons to book include symptoms that start before 45, mood changes that last most days, and questions about bone health or cholesterol, especially with a family history of osteoporosis or heart disease. Bleeding after menopause should never wait for a routine check.
Key Takeaways
- Menopause is reached after 12 months without a period, and many body changes jump abruptly at that point.
- Bone loss is fastest from 1 year before to 2 years after the final period, with 7.38% of spine density lost.
- Total cholesterol, LDL and apolipoprotein B rise within 1 year either side of the final period.
- Frequent hot flushes lasted a median 7.4 years in SWAN, including 4.5 years after the final period.
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