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Hot flashes affect up to 80% of women around menopause and often last seven years or more. Learn the causes, common triggers and treatments that work.
Hot flashes are sudden waves of heat, usually across the face, neck and chest, often with flushing, sweating and a racing heart. They affect up to 80% of women during the menopause transition and typically last a few minutes. For many, they continue for seven years or more. Hormone therapy, newer non-hormonal medicines and CBT can all help.
A hot flash usually starts as a sudden feeling of heat in the chest, neck or face that spreads upward. You might notice:
Most last between one and five minutes. Some people have an occasional mild warmth; others have many intense episodes a day. When they happen during sleep, they're called night sweats.
Hot flashes are a "vasomotor" symptom, meaning they involve the widening and narrowing of blood vessels. Falling and fluctuating estrogen affects the hypothalamus, the part of the brain that controls body temperature.
As estrogen drops, the brain's comfortable temperature range appears to narrow. A small rise in core temperature can then trigger the body's cooling response: blood vessels in the skin widen, you flush and sweat, and your heart rate rises. Newer medicines work by calming the brain cells involved in this pathway.
Up to 80% of women experience hot flashes during the menopause transition. In the Study of Women's Health Across the Nation (SWAN), women with frequent hot flashes had them for a median of 7.4 years in total, including a median of 4.5 years after their final period.
Duration varies:
The NHS notes that women from a Black ethnic background are more likely to have hot flashes that are severe and last longer. A review of international studies found women in East and Southeast Asia generally report hot flashes less often. See how long menopause symptoms last.
Not every hot flash is menopause. Other causes include:
See perimenopause or something else.
Triggers vary from person to person. Commonly reported ones include:
A simple trigger diary for two or three weeks can reveal patterns. Remember that avoiding triggers may reduce hot flashes, but it rarely stops them completely. Our private Symptom Explorer can help you track them.
A clinician may ask about:
For people over 45 with typical symptoms, NICE advises that no blood tests are needed to identify perimenopause or menopause. Tests may be used to check other causes, such as thyroid problems.
The Menopause Society describes hormone therapy as the most effective treatment for hot flashes. NICE recommends offering HRT for hot flashes linked to menopause, after discussing the benefits and risks.
NICE recommends considering menopause-specific CBT for hot flashes, alongside HRT or as an alternative. The evidence shows its biggest effect is on how much hot flashes bother people, and it can also reduce their frequency and severity. It's available face to face, online, in groups or as self-help.
NICE notes some evidence that isoflavones or black cohosh may relieve hot flashes. However, preparations vary, their safety is uncertain, and interactions with other medicines have been reported. If you've had breast cancer, NICE advises caution with St John's wort because of serious interactions, including with tamoxifen.
| Option | How it helps | Worth knowing |
|---|---|---|
| Hormone therapy | Most effective treatment for hot flashes | Benefit-risk depends on age, time since menopause and health history; skin-applied estrogen isn't linked with increased stroke risk |
| Menopause-specific CBT | Reduces how much hot flashes bother you; may reduce frequency | Can be used alone or alongside other treatments; available online |
| Fezolinetant or elinzanetant | Act on the brain's temperature-control pathway | Newer medicines; availability, cost and monitoring vary by country |
| SSRIs, SNRIs, gabapentin, clonidine | Can reduce hot flashes | Not routinely first-line for hot flashes alone under NICE guidance; side effects vary |
| Lifestyle and cooling strategies | Reduce triggers and help you cope in the moment | Useful for everyone, but rarely enough on their own for frequent hot flashes |
This table is a general guide, not a recommendation for any individual.
Book an appointment if:
Seek prompt medical advice if hot flashes come with:
- Fever, unexplained weight loss or swollen glands
- Palpitations with chest pain, fainting or breathlessness
- Diarrhea, tremor or weight loss, which can suggest an overactive thyroid
Seek emergency care for chest pain, severe breathlessness or fainting.
SWAN research has also linked frequent or persistent hot flashes with higher later cardiovascular risk. It's a good reason to check your blood pressure and cholesterol. See heart health after menopause.
See your first menopause appointment for more.
Night sweats · Sleep problems · Heart palpitations · Anxiety
For the bigger picture, see what perimenopause is and what menopause is.
Usually one to five minutes, though some people have longer episodes.
Yes. Some episodes mainly cause internal heat or facial flushing without much sweating.
They aren't usually dangerous in themselves, but they can seriously affect quality of life. Research links frequent hot flashes with higher heart disease risk, so it's worth keeping an eye on heart health.
Yes. They often begin during perimenopause, while periods are still happening.
Cooling down quickly helps. Remove a layer, use a fan and sip a cold drink. Slow breathing may help you feel calmer. For frequent hot flashes, treatment is more effective than in-the-moment measures.
Editorial status: evidence-based educational article; not individually medically reviewed. Last evidence check: September 10, 2026.
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