feisty
Hot flushes are the symptom most people picture when they hear the word menopause. The sudden heat, the flushed skin, the sweat that arrives without warning and vanishes just as fast. Up to 80 percent of women experience them during the menopause transition, and yet the explanation most women receive from their doctor amounts to: "It's hormones. It'll pass." That's not enough. Understanding what's actually happening in the body changes how you manage it.
What a hot flush actually is
A hot flush is a sudden episode of intense heat, usually felt across the face, neck, and chest. It typically lasts between 1 and 5 minutes and may come with sweating, a rapid heartbeat, and a feeling of anxiety or unease. When they happen at night, they're called night sweats, though the underlying mechanism is the same.
The trigger is a narrowing of the thermoneutral zone: the temperature band within which your body doesn't need to sweat or shiver. Normally this zone is a few degrees wide. During perimenopause and menopause, falling oestrogen disrupts the hypothalamus, the brain region that regulates body temperature. The zone narrows dramatically. Even a tiny shift in core temperature, the kind you'd never notice otherwise, is enough to set off a full-scale cooling response. Blood vessels in the skin dilate, heat floods the surface, and sweating begins.
The hypothalamus receives its temperature signals partly through a system involving a neuropeptide called neurokinin B, which is affected by oestrogen levels. When oestrogen falls, this system becomes overactive. That's precisely why newer non-hormonal treatments target this pathway directly.
How long do they last?
The honest answer: longer than most women are told. The average duration is around 7 years, and roughly 1 in 3 women experience hot flushes for more than a decade. Some women report them well into their 60s. Women who go through surgical menopause tend to experience more intense and more frequent episodes because the hormonal drop is abrupt rather than gradual.
Frequency varies widely. Some women have 2 or 3 a day. Others have 20. The pattern often shifts over time, peaking in the years immediately before and after the final period.
What makes them worse
Several things narrow the thermoneutral zone further or trigger the heat response more easily:
- Alcohol, particularly wine and spirits
- Caffeine, especially later in the day
- Spicy food
- Hot drinks consumed quickly
- Stress and cortisol spikes
- A warm room or heavy bedding
- Smoking (smokers experience more frequent and more severe flushes)
Stress deserves a specific mention. The same hypothalamic pathways that govern temperature regulation interact with the stress response. Women who are under sustained pressure often notice their hot flushes intensify. This is one reason that CBT for menopause has clinical evidence behind it: it doesn't cool the body directly, but it reduces the cortisol load that makes flushes worse and makes them feel more manageable when they do arrive.
Treatments that work
Relief options range from lifestyle changes to prescription medication. The right choice depends on symptom severity, health history, and personal preference.
Menopausal hormone therapy (MHT). This is the most effective treatment for hot flushes. Oestrogen therapy directly restores the hormone that the hypothalamus is reacting to, and in clinical trials it reduces flush frequency by around 75 percent. For women without a uterus, oestrogen alone is used. For those with a uterus, a progestogen is added. MHT is available as patches, gels, sprays, and tablets. If your GP hasn't raised it as an option, it's worth asking directly.
Fezolinetant. Approved in several markets including Australia, fezolinetant is a non-hormonal prescription medication that works by blocking the neurokinin B receptor in the hypothalamus. In trials, it reduced moderate-to-severe hot flush frequency by around 60 percent at 12 weeks. It's the first non-hormonal drug designed specifically for the thermoregulatory mechanism rather than just the symptom.
Low-dose antidepressants. SSRIs and SNRIs, particularly venlafaxine, paroxetine, and escitalopram, reduce hot flush frequency by roughly 50 to 60 percent in clinical trials. They're not as effective as MHT, but they're a reasonable option for women who can't or don't want to take hormones.
Gabapentin. Originally an anti-epileptic, gabapentin also reduces flush frequency and is sometimes used when other options aren't suitable. Its side effect profile (drowsiness, dizziness) limits use for some women.
Cognitive behavioural therapy (CBT). Two large randomised controlled trials, including the MENOS1 study, found that CBT reduced the problem rating of hot flushes significantly. It won't stop them, but it changes how disruptive they feel. The online CBT programme Mindfulness and CBT for Menopause symptoms has been validated in clinical trials.
Phytoestrogens and black cohosh. Evidence here is mixed. Some women report improvement with soy isoflavones or red clover extracts. Black cohosh has a small body of trial data supporting modest benefit. Neither is reliably effective, and neither is a substitute for treatment in women with severe symptoms.
Practical things that actually help day-to-day
Medication aside, some practical changes reduce frequency and severity for most women. Dressing in layers makes it easier to cool down fast. Natural fabrics, particularly linen and merino wool, regulate temperature better than synthetics. Keeping a small fan at a desk or bedside makes a measurable difference at night. Cold water on the wrists cools core temperature quickly during a flush.
Exercise is worth its own mention. Regular aerobic activity doesn't eliminate hot flushes, but women who exercise consistently tend to report them as less severe. The mechanism isn't fully understood, but cardiovascular fitness improves thermoregulatory efficiency overall. HIIT workouts built for menopausal women can be a useful starting point if you're not sure how to structure training around your symptoms.
Alcohol is worth cutting before anything else. Even moderate drinking reliably worsens flush frequency for most women, and the effect is dose-dependent. Two glasses of wine at dinner will almost certainly produce a worse night than none.
When to push harder for answers
If hot flushes are disrupting sleep, affecting work, or making daily life difficult, that's a clinical threshold worth taking seriously. Many women normalise severe symptoms because they've been told this is just part of the transition. It doesn't have to be. There are effective treatments. If your current GP isn't engaging with the options, a menopause specialist is worth seeking out. The gap between what's available and what women are being offered remains wide, and closing it starts with asking better questions in the consulting room.