Menopause & Midlife
Hot Flashes: What Causes Them, How Long They Last and How to Get Relief
Hot flashes are sudden waves of heat, flushing and sweating caused by changes in the brain's temperature control as estrogen falls during perimenopause and menopause. They're the most common menopause symptom. Hormone therapy is the most effective treatment, and several proven non-hormonal options work too.
Clinicians call hot flashes and night sweats vasomotor symptoms. If you've been told to just ride them out, know this: you don't have to.
What a hot flash actually feels like
Many people describe it as a switch flipping. A typical one goes something like this:
- A few seconds before: a sense of unease, pressure in the head, or a flicker of anxiety. Some people learn to recognize it.
- The wave: heat rises over the chest, neck and face. Skin may turn red and blotchy.
- The sweat: sometimes a light sheen, sometimes enough to soak a shirt.
- The heart: it may race or pound.
- Afterward: a chill as the sweat cools, sometimes a shiver.
Most hot flashes last a few minutes. Some people get one a week; others get several an hour. At night they're called night sweats, and they can soak your sheets and wreck your sleep. Our guide to menopause night sweats and insomnia covers that side.
What causes hot flashes?
The hypothalamus, a small area deep in the brain, works like a thermostat, and estrogen helps keep it steady. As estrogen drops, certain nerve cells there become overactive. The thermostat's comfort zone narrows, so even a tiny rise in core temperature triggers the full cooling response:
- Blood vessels in the skin widen (flushing)
- You sweat
- Your heart rate may speed up
You're not imagining it, and it's not "just stress." It's a real change in how your brain regulates heat.
When do hot flashes start, and how long do they last?
They often begin in perimenopause, sometimes years before the final period, and tend to peak around the last period and the first years after.
How long they last varies widely. The NIH-funded Study of Women's Health Across the Nation (SWAN) found that many women have hot flashes for several years, and for some they continue for a decade or more. People whose hot flashes start earlier in the transition tend to have them longer. SWAN also found differences by race and ethnicity, with Black women reporting hot flashes for longer on average.
Common triggers
Triggers don't cause hot flashes, but they can set one off:
- Alcohol
- Caffeine
- Spicy food
- Hot drinks
- Warm rooms or hot weather
- Stress
- Smoking
Try a two-week diary on your phone: time, place, what you'd just eaten or drunk, and how bad it was (1 to 5). Patterns show up faster than you'd think.
Quick relief in the moment
- Take off a layer; wear breathable fabrics you can peel
- Turn on a fan (a handheld one fits in any bag)
- Sip cold water
- Run cold water over your wrists
- Keep the bedroom cool, with light, layered bedding
These help you get through an episode. They usually don't reduce how many you have.
Surviving a hot flash in New York City
- On the subway in August: stand near the doors at stops for a blast of air, carry a cold water bottle, and dress in layers so you're not stuck in a sweater on a packed car.
- In a steam-heated apartment: many prewar buildings blast heat all winter. Crack a window, run a fan, and ask the super whether your radiator can be turned down.
- At the office: keep a desk fan, a water bottle and a cardigan you can take off. Ask to sit near a window or vent if your floor runs warm.
- In meetings: pick a seat near the door. A hot flash usually passes in a few minutes, and most people around you won't notice as much as you think.
- At night: try moisture-wicking sleepwear, a cooling pillow and layered bedding.
If hot flashes are affecting your work or confidence, that's reason enough to talk with a clinician about treatment instead of only coping.
Treatments that actually reduce hot flashes
| Option | How well it works | Notes |
|---|---|---|
| Hormone therapy | Most effective | Generally favorable benefit-risk for healthy people under 60 or within 10 years of menopause |
| Fezolinetant | Effective | Non-hormonal; requires liver blood tests |
| SSRIs/SNRIs (incl. low-dose paroxetine) | Moderately effective | Can help mood; some interact with tamoxifen |
| Gabapentin | Moderately effective | Can cause drowsiness; may help sleep |
| Oxybutynin | Effective in studies | Use with caution in older adults |
| CBT and clinical hypnosis | Reduce bother; hypnosis reduces frequency | No drug side effects |
| Weight loss | May help | For people with overweight or obesity |
Hormone therapy
Estrogen, plus a progestogen if you have a uterus, reduces hot flashes more than any other treatment, according to The Menopause Society. It also helps prevent bone loss. Many people notice a difference within a few weeks. Read about menopause hormone therapy benefits and risks.
Non-hormonal prescriptions and therapies
If hormones aren't right for you, there are several evidence-based choices. Our guide to non-hormonal treatment for hot flashes compares them.
Myth vs. fact
- Myth: "Black cohosh or soy will fix it." Fact: The Menopause Society doesn't recommend herbal supplements like black cohosh, soy isoflavones, acupuncture, yoga or paced breathing specifically for hot flashes, because studies haven't shown consistent benefit. Be wary of products sold online as menopause cures.
- Myth: "Hormone therapy is too dangerous for anyone." Fact: for healthy people under 60 or within 10 years of menopause, the benefits generally outweigh the risks. Your own history matters, so it's a conversation worth having.
- Myth: "It'll be over in a year." Fact: for many people it lasts several years, sometimes more than a decade.
Hot flashes and your long-term health
Hot flashes aren't dangerous on their own, but they matter:
- Sleep: night sweats can cause chronic sleep loss, which hits mood, focus and work.
- Quality of life: frequent hot flashes can affect confidence and relationships.
- Heart health: some studies have found frequent or persistent hot flashes are associated with markers of higher cardiovascular risk. That doesn't mean they cause heart disease, but it's a reason to check blood pressure, cholesterol and blood sugar.
When it might not be menopause
Flushing and sweating can have other causes:
- An overactive thyroid
- Medicines (some antidepressants, opioids, tamoxifen, aromatase inhibitors and others)
- Infections, which may cause night sweats with fever
- Anxiety or panic attacks
- Alcohol flushing
- Rarely, certain tumors or blood cancers
When to see a doctor
Talk to a gynecologist, OB/GYN or women's health nurse practitioner if:
- Hot flashes disrupt your sleep, work or daily life
- You have hot flashes before age 40, or they start long after menopause with no earlier symptoms
- Night sweats come with fever, unexplained weight loss or swollen lymph nodes
- You have a racing heartbeat with chest pain, shortness of breath or fainting (get urgent care)
- You want to discuss hormone or non-hormonal treatment
Bring your hot flash diary and a list of every medicine and supplement you take.
Getting help in New York
You don't need to tough it out. Ask when you call whether the clinician regularly treats menopause symptoms; not every practice focuses on it. Search the directory, or browse gynecologists in Manhattan and women's health nurse practitioners across the five boroughs, Long Island and the Hudson Valley.
Frequently asked questions
What does a hot flash feel like?
A sudden wave of heat, usually in the face, neck and chest, often with flushing, sweating and a fast heartbeat. It may be followed by chills and usually lasts a few minutes.
How long do menopause hot flashes last?
It varies a lot. Many people have hot flashes for several years, and research such as the SWAN study found that for some women they continue for a decade or longer.
What is the fastest way to stop a hot flash?
In the moment, cool down fast: take off a layer, use a fan, sip cold water. For lasting relief, hormone therapy and several non-hormonal medicines reduce how often hot flashes happen.
Can hot flashes be caused by something other than menopause?
Yes. Thyroid problems, some medicines, infections, anxiety, alcohol and, rarely, certain tumors can cause flushing or sweating. See a clinician if your hot flashes don't fit the typical pattern.
Are hot flashes linked to heart health?
Research suggests frequent or persistent hot flashes may be associated with higher cardiovascular risk markers. That's a good reason to keep up with blood pressure and cholesterol checks.
Sources
- The Menopause Society — 2022 Hormone Therapy Position Statement
- The Menopause Society — 2023 Nonhormone Therapy Position Statement
- NIH — Study of Women's Health Across the Nation (SWAN)
- NIH National Institute on Aging — Hot Flashes: What Can I Do?
- ACOG — The Menopause Years (Patient FAQ)
This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.