Hot flushes and night sweats
What a hot flush actually is, how long they typically last, why they are longer and more frequent for Black women, and what genuinely reduces them.
A hot flush is a sudden feeling of intense heat, usually across the face, neck and chest, often with sweating, a racing heart and a chill afterwards. Most last two to four minutes. They are caused by the brain's temperature-regulating centre becoming hypersensitive as oestrogen falls, so a tiny rise in core temperature triggers a full cooling response.
What to hold on to
- They typically last two to four minutes, and the chill afterwards is part of the same event rather than something separate.
- For most women they persist for years, not months. The SWAN cohort found a median of around seven and a half years across all women.
- Black women in SWAN experienced them roughly 50% more often and for around ten years rather than six and a half. This is not a minor variation and it is rarely reflected in the advice given.
- Night sweats are the same mechanism while asleep, and they are one of the main reasons sleep breaks in this decade.
- Hormone therapy remains the most effective treatment. Non-hormonal options exist and have real evidence, including a newer class of drug that targets the mechanism directly.
What is actually happening
Your hypothalamus keeps your core temperature inside a narrow comfortable band. As oestrogen falls, that band narrows, so a rise in temperature that would previously have passed unnoticed now reads as overheating.
The body responds the way it responds to genuine overheating: it dilates the blood vessels near the skin, which produces the flush and the heat, and it sweats. Then, having overcorrected, you are cold.
Understanding this makes the practical advice less arbitrary. Layers work because you can shed the outer one in the ninety seconds before the peak. A cool bedroom works because it widens the margin before the trigger. None of it is willpower.
The part that gets left out
Most published guidance describes hot flushes as a symptom of menopause lasting a year or two. The longitudinal data does not support that, and the difference between groups of women is large.
In the SWAN cohort, total duration of frequent vasomotor symptoms had a median of around seven and a half years. Black women reported them roughly 50% more frequently than white women and for a substantially longer total duration, around ten years.
Black women are also prescribed hormone therapy at roughly half the rate.
If you are a Black or Caribbean woman who has been told this will pass shortly and has now been dealing with it for six years, the data is on your side rather than yours being an unusual case.
What helps
Hormone therapy is the most effective treatment available, and the labelling changed materially in November 2025. Non-hormonal prescription options exist and work, including a drug class that targets the specific brain pathway involved rather than working around it.
Cognitive behavioural therapy reduces the impact of flushes even where it does not reduce their number.
Cooling strategies, trigger identification, weight management and reducing alcohol all have a place, and none of them are a reason to accept ten years of it without discussing treatment.
What else could cause this
Not everything in your forties is hormonal. These are the other explanations worth ruling out, and how they usually differ.
- Thyroid dysfunction
- An overactive thyroid produces heat intolerance and sweating, but tends to be constant rather than arriving in discrete waves that pass in minutes.
- Medication side effects
- Some antidepressants, tamoxifen, aromatase inhibitors and opioids all cause flushing. Worth reviewing what you take before assuming.
- Infection
- Sweats with fever, weight loss or feeling generally unwell is a different picture and needs assessment rather than management.
- Anxiety and panic
- Panic produces heat and sweating too, but usually with fear leading rather than following, and the heat is less clearly a wave from the chest upwards.
- Alcohol, caffeine and spicy food
- Common triggers rather than causes. If your flushes cluster after wine or coffee, that is worth two weeks of testing before anything else.
When to speak to a professional
- They are disrupting your sleep or your working day.
- They come with fever, unexplained weight loss or feeling generally unwell.
- You want to discuss treatment and have been told to wait until your periods stop, which is not a rule.
Seek care urgently, not an appointment next month, if: sweats with fever, weight loss or feeling systemically unwell.
Is this one thing, or part of a pattern?
Most women arrive noticing one change and find four more they had filed under stress or a bad week.
Four minutes. Your result appears before anything is asked of you.
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How long will this go on?
Longer than most women are told. The SWAN cohort, which followed women for years rather than months, found a median total duration of around seven and a half years, and around ten years for Black women. The common advice that it lasts a year or two does not match the data.
Do I have to wait until my periods stop to be treated?
No. Treatment is based on symptoms, not on whether you have reached a particular milestone. Many women are treated during perimenopause while still having periods.
What works if I cannot take hormones?
There are non-hormonal prescription options with real evidence, including certain antidepressants used at lower doses for this purpose and a newer class of drug that acts on the brain pathway responsible for the flush itself. Cognitive behavioural therapy has evidence for reducing how much flushes bother you, which is a different and still valuable outcome. This is a prescribing conversation, so it belongs with a clinician.
Things that often come together with this
Sources
Updated 27 August 2026
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