Why Do Hot Flushes Happen, and How Can They Be Eased?
Why menopausal hot flushes happen, how long they last, what makes them worse, and the hormonal and non-hormonal treatment options available.
Short answer: A hot flush is a misfiring of the brain's temperature-control centre in response to falling oestrogen. Around 70-80% of women in the menopause transition experience it, it typically lasts several years on average, and it can be eased with approaches ranging from lifestyle measures to hormone therapy.
Why Do Hot Flushes Happen?
The brain's temperature-control centre (the hypothalamus) keeps body temperature within a narrow "safe zone." When oestrogen drops, the oestrogen brake on certain nerve cells in this centre is lifted, and that safe zone narrows markedly. As a result, even a tiny rise in body temperature gets read by the brain as "overheating." To cool the body quickly, blood vessels in the skin suddenly widen — causing a sudden flush and warmth across the face and upper chest — followed by sweating; as the sweat evaporates and the body loses heat rapidly, chills, shivering and sometimes a racing heartbeat can follow.
How Long Does It Last, and How Common Is It?
Around 70-80% of women in the menopause transition experience hot flushes; in about a third, symptoms are severe enough to disrupt daily life and sleep. A long-running study found the average duration is 7.4 years, continuing for an average of 4.5 years after the final period. Women whose symptoms start before menopause (in perimenopause) can have an even longer total duration. Hot flushes aren't limited to the early years of menopause either — they can persist in around 40% of women over 60, and in 8-9% of women in their seventies.
What Makes It Worse?
- Weight and abdominal fat: can increase the frequency and severity of hot flushes.
- Smoking: speeds up oestrogen breakdown, bringing menopause earlier and worsening flushes.
- Caffeine, alcohol, spicy food and very hot drinks: can trigger an episode by stimulating the temperature centre.
- Stress and anxiety: higher stress levels can make episodes more frequent.
- Surgical menopause: when the ovaries are removed suddenly by surgery rather than tapering off gradually, hot flushes tend to be far more severe.
Lifestyle and Non-Hormonal Options
Dressing in layers, keeping the environment cool, quitting smoking, managing weight, and limiting alcohol and caffeine can all bring relief. Regular exercise and yoga support overall health and sleep, though controlled studies haven't shown they meaningfully reduce hot flush frequency on their own. Cognitive behavioural therapy (a talk-therapy approach that works on thought and behaviour patterns) has the strongest evidence among non-hormonal options and can meaningfully ease the stress and sleep disruption hot flushes cause. Prescription non-hormonal medicines — certain antidepressant classes, nerve-pain medicines, and newer drugs that target the brain's temperature centre — can also be considered under a doctor's evaluation.
When Does Hormone Therapy Come In?
Hormone therapy is considered the most effective option in medicine for easing hot flushes and night sweats, and can reduce symptoms substantially. Bioidentical hormones are chemically identical to what the ovaries naturally produce; usually applied through the skin (gel, spray, patch), they don't burden the liver or raise clot risk. Starting hormone therapy within the first 10 years of menopause or before age 60 can help ease hot flushes while also supporting bone and cardiovascular health. That said, every hormone therapy plan is individual — suitability is determined by a doctor's evaluation.
Outcomes of any treatment decision can vary from person to person. It's recommended to get detailed advice from your doctor before starting hormone therapy.
Frequently Asked Questions
Do all women experience hot flushes with the same intensity?
No. It can vary widely depending on factors like weight, smoking, stress levels and how menopause began (natural or surgical).
Do hot flushes only happen in the first few years of menopause?
For most women they ease within a few years, but for some they can last over a decade — some women still experience them even at an advanced age.