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Is HRT dangerous? Do hot flashes last a year? Does menopause cause weight gain? We check 14 common menopause beliefs against current evidence and guidelines.
Many common beliefs about menopause are outdated or only partly true. Hot flashes often last seven years or more, not one or two. Most people over 45 don’t need a blood test. Hormone therapy is neither dangerous for everyone nor right for everyone. Weight changes at menopause are more about body composition than the number on the scale.
Fact: The World Health Organization notes that natural menopause generally happens between 45 and 55 worldwide, and the US average is 51. It can happen earlier, and around 3.5% of women may reach it before 40. See menopause at 40, 45, 50 and beyond.
Fact: Hot flashes are common, affecting up to 80% of women, but menopause can affect sleep, mood, concentration, joints, skin, the bladder and sexual health. Genitourinary syndrome of menopause, which covers vaginal and urinary symptoms, affects about 55% of postmenopausal women in a systematic review. See what menopause is.
Fact: In the SWAN study, frequent hot flashes (called hot flushes in the UK) and night sweats lasted a median of 7.4 years. They continued a median of 4.5 years after the final period. Vaginal and urinary symptoms often persist without treatment. See how long menopause symptoms last.
Fact: NICE advises that people aged 45 or over with typical symptoms can usually be identified as being in perimenopause or menopause without laboratory tests. Hormone levels fluctuate too much for a single test to be reliable. Tests matter more under 45. See perimenopause tests.
Fact: Ovulation continues unpredictably during perimenopause. UK guidance advises contraception for 2 years after your last period if under 50, or 1 year if 50 or over, and it can stop at 55 for everyone. See pregnancy during perimenopause.
Fact: Only if both ovaries are removed. The NHS explains that if the ovaries are kept, you go through menopause naturally, although possibly sooner than you otherwise would. See surgical menopause.
Fact: Risks depend on your age, health history, and the type, dose and route of hormone therapy. The Menopause Society’s 2022 position statement concludes that the benefits generally outweigh the risks for treating bothersome hot flashes and preventing bone loss in people who:
In November 2025, the US Food and Drug Administration (FDA) began removing statements about cardiovascular disease, breast cancer and probable dementia from the boxed warning on hormone therapy labels. It pointed to studies suggesting hormone therapy has few risks when started before 60 or within 10 years of menopause.
That doesn’t make HRT right for everyone. People with a history of heart attack, stroke, blood clots, hormone-sensitive cancer or active liver disease need careful individual discussion.
Fact: The relationship is more nuanced, and it depends on the type of HRT:
Your personal and family history matter, and this is worth a detailed conversation with your clinician.
Fact: There is no fixed limit. The Menopause Society says hormone therapy does not need to be routinely stopped at 60 or 65. Continuing can be considered for persistent symptoms, quality of life or bone protection, with regular review of benefits and risks.
Fact: Many regulated HRT products contain hormones that are chemically identical to those your body makes. These are sometimes called "body-identical." However, custom-compounded "bioidentical" preparations are a different matter. The 2024 international guideline on premature ovarian insufficiency states they are not recommended, because data on their effectiveness and safety are lacking.
Fact: Low-dose vaginal estrogen works locally and only minimal amounts are absorbed into the bloodstream. An FDA advisory panel in 2025 recommended removing or revising the boxed warning on vaginal estrogen for that reason. NICE recommends offering it for vaginal and urinary symptoms, including to people already using HRT. See vaginal dryness.
Fact: It is more accurate to say menopause changes body composition. In the SWAN study, weight rose steadily with age rather than jumping at the transition. However, the rate of fat gain doubled and lean muscle began to decline, until about two years after the final period. The scale may not show it, but the shift from muscle to fat matters for health. Strength training helps. See weight changes.
Fact: SWAN found a subtle, temporary dip in learning and memory during perimenopause that resolved after menopause. Memory changes that are sudden, getting steadily worse or affecting daily life should still be checked. See brain fog.
Fact: "Natural" doesn’t mean safe or effective. NICE notes there is some evidence that isoflavones or black cohosh may ease hot flashes, but preparations vary and their safety is uncertain. Some supplements can also interact with prescription medicines. Always tell your clinician what you take.
Several reasons:
A good rule of thumb: look for information that names its sources, shows when it was last reviewed, and distinguishes between strong evidence and uncertainty.
If you have read something that worries or confuses you, it is reasonable to bring it to an appointment. Useful questions include:
See your first menopause appointment for more.
For most healthy people with bothersome symptoms who start treatment under 60 or within 10 years of menopause, guidance concludes that the benefits generally outweigh the risks. Safety depends on your health history and the type of HRT, so it needs an individual discussion.
Weight tends to rise gradually with age, but menopause changes body composition. Fat increases and muscle declines around the transition, even if the scale changes little.
For most people, no. Frequent hot flashes last a median of 7.4 years, although some people have them for a shorter time.
Many regulated HRT products already contain body-identical hormones. Custom-compounded "bioidentical" preparations are not recommended by international guidance because of a lack of safety and effectiveness data.
The biology is the same, but experiences differ. A review of international studies found women in East and Southeast Asia generally reported hot flashes less often than women in Western countries. Insomnia, irritability and joint stiffness were more commonly reported. The WHO notes that culture, family and how society views ageing all shape the experience.
Editorial status: evidence-based educational article; not individually medically reviewed. Last evidence check: September 10, 2026.
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