Hot Flushes and Night Sweats: Why They Happen and How to Cool Them

By the Fit and Healthy Being Editorial Team · Updated 10 July 2026

A wave of heat climbs your chest and neck out of nowhere. Your face flushes, your heart picks up, and a minute later you are clammy and cold. At night it is worse — you wake drenched, throw off the covers, and sleep splinters. Hot flushes and night sweats are the most recognisable signs of the menopause transition, and while they are harmless in themselves, they can be genuinely miserable. Here is why they happen and what the evidence says actually helps — beyond “dress in layers”.

What a hot flush actually is

Deep in the brain sits your temperature thermostat, the hypothalamus. Normally it tolerates a comfortable range of body temperatures without reacting. As oestrogen fluctuates through the transition, that tolerant range narrows, so the thermostat becomes twitchy: a tiny rise it would once have ignored now reads as “too hot”, and it fires the body’s full cooling routine — blood vessels near the skin open (the flush), you sweat, and your heart rate lifts. A few minutes later, cooled down, you can feel chilled. Nothing is actually wrong with your temperature; the alarm is simply over-sensitive.

Why they happen now

The trigger is falling, fluctuating oestrogen, which shifts the brain chemistry that sets the thermostat’s sensitivity. That growing understanding is exactly why a newer group of non-hormonal medicines, which act on those brain signals directly, can reduce flushes. For some women the flushes are mild and occasional; for others they are frequent and drenching — both are within the normal range.

Find your triggers

Flushes often have personal triggers that pour petrol on the fire. The usual suspects are external heat, hot drinks, spicy food, caffeine, alcohol and stress. For a week or two, jot down when flushes hit and what came just before — many women spot a clear pattern (the evening glass of wine, the rushed hot coffee) and can head some off simply by adjusting that trigger.

What genuinely helps

Start with the practical, then layer on the evidence-based options:

• Cool the environment. A fan, a cooler bedroom, breathable natural fabrics, layers you can shed, and cold water to hand.
• Use paced breathing at the first sign. Slow breaths from the belly can take the edge off a rising flush.
• Protect sleep aggressively. The night-sweats to poor-sleep to worse-days loop is where flushes do the most damage.
• Consider cognitive behavioural therapy (CBT). It will not stop the flushes, but it has good evidence for reducing how much they bother you and disrupt your sleep — and it is drug-free.

For medical options, hormone therapy is the most effective treatment for flushes in women who are suitable, and there are also several non-hormonal prescription options, including a newer class developed specifically for this symptom. Which, if any, suits you depends on your health and preferences — so it is a conversation to have with a professional, not a decision to make from an article.

The honest truth about supplements

Herbal remedies are heavily marketed for flushes, but the evidence is underwhelming. Black cohosh — the most popular — has produced mixed and largely unconvincing results in good-quality trials, and in rare cases has been linked to liver problems, so it is not generally recommended. Other favourites such as evening primrose oil have little supportive evidence. If you still want to try something, tell a professional first, especially if you take other medication: “natural” does not automatically mean safe or effective.

When to see a professional

See a professional if flushes are disrupting your sleep, work or wellbeing, or if you want to discuss treatment. It is also worth a check if anything is unusual — flushes alongside unexplained weight loss, a racing or irregular heartbeat, or flushes that begin long after menopause — because occasionally other conditions can mimic them.

Frequently asked questions

How long do hot flushes last?

A single flush usually lasts a few minutes. As a phase, vasomotor symptoms often persist for several years — for some women more than a decade — though they typically ease over time. Managing triggers and sleep can improve things long before they stop on their own.

What triggers hot flushes?

Common triggers include heat, hot drinks, spicy food, caffeine, alcohol and stress. They are individual, so a short two-week diary is the fastest way to find yours.

Does black cohosh work for hot flushes?

The evidence is mixed and mostly unconvincing, and it has rare links to liver problems, so it is not generally recommended. Discuss it with a professional before trying it, particularly alongside other medicines.

Can I manage night sweats without hormone therapy?

Often, yes — a cool bedroom, breathable bedding, trigger changes, paced breathing and CBT all help, and non-hormonal prescription options exist too. Hormone therapy is the most effective medical route for those suited to it, but it is not the only one.

Are hot flushes ever a sign of something else?

Usually they are simply menopausal, but flushes with unexplained weight loss, palpitations, or that begin well after menopause are worth a professional check, as other conditions can occasionally cause similar symptoms.

What helps fastest in the moment?

Cool air or a fan, sips of cold water, shedding a layer, and slow paced breathing. Catching a flush early with breathing can blunt how intense it becomes.

Products we think are worth a look

Fit and Healthy Being is reader-supported. Some links below are affiliate links: if you buy through them we may earn a small commission at no extra cost to you. This is education, not medical advice. See our affiliate disclosure.

A menopause-focused supplement made for women moving through the perimenopause-to-menopause transition. If you and your doctor are weighing supplement options for energy, mood and hormone balance, it is one to review.