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A hot flush is a sudden wave of heat that spreads across the chest, neck, and face, often followed by sweating, a rapid heartbeat, and a chill as the body tries to cool down. It can last anywhere from 30 seconds to 5 minutes. For some women it's a passing inconvenience. For others it's 10 or more episodes a day, including several at night, that erode sleep and concentration over months or years. The experience is real, it's physiological, and it doesn't have to be something you just endure.
What's actually causing a hot flush
Hot flushes are triggered by a narrowing of the thermoneutral zone, the range of body temperatures the brain considers normal and leaves alone. In the years around menopause, falling oestrogen levels affect the hypothalamus, the brain region that controls body temperature. The hypothalamus becomes hypersensitive, interpreting small rises in core temperature as overheating and firing off a heat-dissipation response: blood vessels near the skin dilate, sweat glands activate, and the heart rate climbs. None of that is actually necessary. The body isn't overheating. The signal is a false alarm.
The trigger is hormonal, but the intensity varies. Stress, caffeine, alcohol, spicy food, and warm rooms can all make the alarm fire more easily. So can tight clothing, hot showers, and emotional arousal. Identifying personal triggers doesn't eliminate hot flushes, but it can reduce their frequency in a meaningful way.
How common they are and how long they last
Around 75% of women going through menopause experience hot flushes. For most, they begin during perimenopause, sometimes years before the final period. They tend to peak in frequency in the 2 years after the last period, then gradually taper. The average duration across the whole episode is around 7 years, though studies have found that some women continue having hot flushes into their 60s and 70s. Women who enter menopause earlier, or who go through surgical menopause (removal of the ovaries), often experience more severe and longer-lasting hot flushes because the hormonal drop is sharper and faster.
Night-time hot flushes, often called night sweats, are the same physiological event happening during sleep. They're particularly disruptive because they pull women out of deep sleep stages repeatedly, contributing to fatigue, mood changes, and cognitive fog that can be mistaken for unrelated problems. If you want a fuller picture of how symptoms overlap and compound, the menopause symptoms nobody warns you about covers the less-discussed ways hot flushes interact with other changes.
Treatments that have genuine evidence
Hormone replacement therapy (HRT) is the most effective treatment for hot flushes. Clinical trials consistently show a 75–90% reduction in frequency and severity. HRT works by restoring enough oestrogen to widen the thermoneutral zone again, so the hypothalamus stops firing false alarms. Not everyone can take it, and decisions should be made with a GP who knows your history, but the evidence for its effectiveness is not in dispute. For a detailed breakdown of how HRT works and who it's appropriate for, the article on HRT for menopause covers the mechanism, the options, and how to have the conversation with your doctor.
For women who can't or don't want to take HRT, several non-hormonal options have solid evidence. NPS MedicineWise notes that low-dose SSRIs and SNRIs (antidepressants used at lower doses than those prescribed for depression) can reduce hot flush frequency by around 50% in some women. Gabapentin, a nerve-pain medication, has similar evidence. Neither is approved specifically for hot flushes in Australia, but both are used off-label with genuine clinical support.
Cognitive behavioural therapy (CBT) doesn't reduce the number of hot flushes, but it does reduce how disruptive women find them. Trials run through the British Menopause Society found that CBT improved quality of life and reduced the distress associated with hot flushes even when the frequency stayed the same. It's not a first choice for severe symptoms, but it works well alongside other approaches.
What the "natural" options can and can't do
Phytoestrogens, plant compounds that weakly mimic oestrogen, are the most studied natural approach. Red clover isoflavones and soy isoflavones both show modest reductions in hot flush frequency in clinical trials, typically in the range of 20–30%. That's meaningful for mild symptoms. It's not a substitute for HRT in severe cases. Black cohosh has a longer folk history but weaker clinical evidence, and questions about liver safety mean it's not universally recommended. For a closer look at the supplement evidence, see the 7 natural menopause treatments with real evidence behind them.
Lifestyle adjustments don't eliminate hot flushes but they reduce their load. Keeping rooms cool, sleeping in moisture-wicking fabrics, reducing alcohol, and practising slow, paced breathing during a flush (6 breaths per minute) each have at least some clinical backing. They work best as a foundation, not a complete solution.
When to see a doctor
Hot flushes don't require a GP visit if they're mild and manageable. They do warrant a conversation if they're affecting sleep more than 3 nights a week, if they're significantly disrupting work or daily life, or if they're accompanied by other symptoms like heart palpitations, unexplained weight changes, or irregular bleeding. A GP can assess whether the pattern fits perimenopause or warrants further investigation, and can discuss the full range of treatment options rather than leaving you to manage it alone.
The most important thing to understand is that a hot flush is not a minor inconvenience women should accept without question. It's a treatable symptom with multiple evidence-based options, and the best choice depends on severity, health history, and personal preference. Getting a clear picture of the options is the first step toward finding what actually works.