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Vasomotor Symptoms and Why They Happen

Clinically reviewed and approved by Effica's Health Strategy Team
Content last revised January 14, 2026

Key Facts about Vasomotor Symptoms

Vasomotor symptoms (VMS), including hot flashes and night sweats, are the most common symptom of menopause, affecting up to 75–80% of women.1,4,6

Symptoms often last on average 7–8 years, but in some women, they persist for 10 years or more.3

VMS are linked not only to discomfort and sleep disruption, but long-term studies suggest a higher risk of heart disease with frequent, persistent symptoms.6

There are effective treatments (hormonal and non-hormonal), as well as lifestyle and self-care strategies to reduce frequency and severity.1,2,4,7

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What Every Woman Should Know About VMS

Very common

Up to 75–80% of women experience hot flashes and night sweats during menopause3,5

Can last for years

On average, symptoms continue for 7–8 years, but some women have them for more than a decade.3

What they feel like

Sudden waves of heat in the face, neck, or chest, lasting 1–5 minutes, often with flushing, sweating, palpitations, anxiety, or chills.5

Night sweats

Hot flashes during sleep that can cause waking, sweating, and difficulty getting back to sleep.5

Why they happen

Fluctuating or declining estrogen affects the brain’s thermostat (hypothalamus), making the body more sensitive to temperature changes.5,7

Who is more affected

Women who smoke, carry extra weight, go through early or surgical menopause, or who are Black or Hispanic are more likely to have frequent/severe symptoms.5

Impact on life

VMS can cause sleep disruption, fatigue, mood changes, embarrassment, and limitations on social life, work productivity, or daily activities.5,8

Triggers

Heat, hot rooms, spicy foods, alcohol, caffeine, stress, smoking, and excess weight can make symptoms worse.5,9

What helps

Cool environments, layered clothing, relaxation techniques, good sleep habits, exercise, maintaining a healthy weight, and avoiding triggers.7,9

Treatment options

Menopausal hormone therapy (MHT) is the most effective; non-hormonal medicines (SSRIs, SNRIs, gabapentin, clonidine, oxybutynin, fezolinetant or elinzanetant), behavioural therapies (CBT, mindfulness), and some complementary approaches may also help1,4,7,9

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Here's what to know about VMS

Symptoms of VMS

Hot flashes are sudden waves of heat, usually felt in the face, neck, or chest. They last 1–5 minutes and may cause flushing, sweating, anxiety, a racing heartbeat, or sometimes chills. Night sweats are hot flashes that occur during sleep, often waking women up and leaving them uncomfortable.5 

Up to 75–80% of women experience these symptoms during menopause. For most, they last 7–8 years, but in some women, they persist for more than a decade. About a quarter of women report moderate to severe symptoms that disrupt daily life, sleep, mood, and concentration.3,5,8 

The main cause is falling or fluctuating estrogen levels during menopause. These hormonal changes affect the hypothalamus (the brain’s thermostat), making it more sensitive to small shifts in body temperature. The result is flushing, sweating, and sometimes chills as the body works to rebalance.5 

Symptoms may be more frequent or severe in women who smoke, carry extra weight, or enter menopause early (naturally or after surgery/medical treatments). Race and ethnicity also play a role as some studies suggest African American and Hispanic women often report more severe symptoms, while East Asian women may experience fewer.5,8 

Treatment

Menopausal hormone therapy (MHT)

The most effective treatment for moderate to severe symptoms.2

Non-hormonal medicines

SSRIs, SNRIs, gabapentin, oxybutynin, clonidine, and newer drugs like fezolinetant or elinzanetant can help when hormones aren’t suitable.1,4

Non-drug options

Cognitive behavioral therapy (CBT), mindfulness, and hypnosis can make symptoms less bothersome and improve sleep and mood.1,4

Complementary therapies

Acupuncture, yoga, soy products, and herbal remedies are used by some women, but evidence is mixed, and safety can vary.7,9

When to Seek Help6,7

See your healthcare provider if: 

  • Symptoms are severe, frequent, or interfering with daily life. 

  • Night sweats repeatedly disturb your sleep. 

  • You notice unusual symptoms such as fever, rash, weight loss, or bleeding. 

  • You have medical conditions like breast cancer, heart disease, or clotting disorders that affect treatment decisions. 

  • You are considering hormone or non-hormone therapies and want to review risks and benefits. 

Many women find simple strategies help reduce discomfort: 

  • Keep rooms cool, dress in layers, and use fans. 

  • Avoid triggers like hot drinks, spicy food, alcohol, caffeine, and smoking. 

  • Stay active and maintain a healthy weight. 

  • Practice paced breathing, relaxation, or mindfulness. 

  • Improve sleep hygiene by keeping a consistent schedule and creating a cool, comfortable bedroom. 

  • Track symptoms in a diary to identify personal triggers. 

  • Seek support from family, healthcare providers, or menopause groups. 

Summary

Hot flashes and night sweats are common during menopause and can affect quality of life. While they may last for years, there are many ways to manage them—from lifestyle adjustments to medical treatments. The right approach depends on your symptoms, health, and preferences, and your healthcare provider can help you find the best plan.

Here's the full picture

Vasomotor symptoms (also called hot flashes, hot flushes, night sweats, or temperature dysregulation) are mini “heat waves” most commonly experienced by women during the menopause transition. They affect around 80% of women, with certain groups, such as smokers, and those with obesity, reporting more frequent or more severe symptoms.5 There is also some variation by race/ethnicity with African American and Hispanic women in some studies reporting more frequent or more severe symptoms whereas some evidence suggest East Asian populations report fewer.5

Hot flashes are usually felt as a sudden wave of heat in the upper body, especially the face, neck, and chest. They may last 1–5 minutes, and can be accompanied by flushing, sweating, anxiety, palpitations, or chills (“cold flashes”). Episodes vary in frequency with some people having a few per week, whereas others may have many per day.5,7  

Night sweats are hot flashes that occur during sleep, often leading to waking, sweating, and difficulty falling back to sleep. 

The exact cause of vasomotor symptoms isn’t fully understood, but declining and fluctuating estrogen levels disrupt the hypothalamus, the brain’s temperature regulator, making it overly sensitive to small changes in body temperature. This triggers peripheral blood vessel dilation (flushing), sweating, and sometimes chills as the body tries to restore balance.5 Recent research shows that overactive KNDy neurons in the hypothalamus play a key role in this process by sending excessive neurokinin B signals, leading to hot flashes and night sweats.  This has led to the development of new treatments that block this pathway to reduce these symptoms without the use of hormones.7 

Women with severe VMS appear to be more sensitive to small changes in body temperature. 

Hot flashes often start in perimenopause and may continue for an average of 7–8 years, with some women experiencing them for over a decade.3 

Recent studies show that women with frequent, persistent VMS may be at increased risk of cardiovascular disease over the long term.6 

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Impact of Vasomotor Symptoms

Hot flashes and night sweats may be mild, moderate, or severe. About 25% of women experience moderate to severe hot flashes which can significantly disrupt daily life. Night sweats can cause frequent waking, sleep deprivation, fatigue, lowered mood, and difficulty concentrating. VMS can lead to embarrassment (flushing, sweating), avoidance of warm environments, and work performance issues. May lead to avoidance of certain social situations, clothing styles, or activities to reduce risk of triggers possibly leading to limited physical or social interaction.5,8 

Persistent bothersome VMS have been linked to higher cardiovascular risk and may contribute to mood disorders making management important for both quality of life and overall health.6 

In menopause and perimenopause, the natural decline of ovarian hormone production is the primary cause. Surgical menopause (removal of ovaries), treatments like chemotherapy or radiation can cause sudden and more severe symptoms due to abrupt hormonal changes. 

Smoking, obesity, Black or Hispanic ethnicity is associated with higher risk and more severe symptoms.  Early menopause (natural or induced by surgery or medical treatments) can lead to more prolonged and severe symptoms.5 

What Makes It Worse? Heat, hot rooms, spicy food, alcohol, caffeine, stress, smoking and excess weight.5,9 

What Makes It Better? Cool environments, dressing in layers, paced breathing, relaxation, healthy sleep hygiene, weight management, smoking cessation and avoiding known triggers.7,9 

Vasomotor Symptom Management

Lifestyle & Self-Care

Lifestyle strategies such as keeping rooms cool, dressing in layers, and avoiding triggers like spicy foods, alcohol, and caffeine are commonly recommended and supported by practical experience, though scientific evidence for directly reducing hot flashes is limited. Regular exercise, stress management, and paced breathing have shown some benefit in small studies, but results are inconsistent. Even so, these approaches are safe, low-cost, and beneficial for overall health, making them a worthwhile first step or complement to other treatments. 4,7,9 

Non-Drug/Behavioural Therapies

Non-drug approaches such as cognitive behavioural therapy (CBT) and clinical hypnosis have the strongest evidence for reducing the distress and severity of hot flashes and improving sleep and mood. Mindfulness, relaxation techniques, and paced breathing may also help some women, but the scientific evidence for their effectiveness is weaker and less consistent. Acupuncture and certain herbal products have been studied with mixed or limited results. While these approaches may not completely stop symptoms, they are generally safe when guided by a qualified practitioner and can enhance overall well-being..1,4 

Complementary Therapies

Complementary approaches such as phytoestrogens (like soy or isoflavones) and black cohosh have been studied for hot flashes, but results are mixed and generally show only modest or inconsistent benefit. Acupuncture has shown some positive effects in clinical trials, though evidence remains variable, while yoga and tai chi may improve overall well-being and stress but have weaker evidence for directly reducing hot flashes. Because research is limited and herbal products can vary in safety and quality, it’s best to discuss these options with your healthcare provider before trying them.1,7 

Medical Treatments

Menopausal Hormone Therapy (MHT) is the most effective treatment for VMS and is best for moderate to severe symptoms when quality of life is significantly affected. Non-hormonal options (SSRIs/SNRIs, gabapentin, oxybutynin, clonidine, fezolinetant or elinzanetant) can also be effective options for those who cannot or prefer not to use hormones. Treatment should be personalized, and the benefits and risks of any treatment should be discussed with your provider.12,4 

When to Seek Help1,2,3,4,6,7,9

Women should seek medical attention if vasomotor symptoms become severe, frequent, or interfere with daily functioning, such as work, sleep, or mood. Night sweats that are so intense they repeatedly wake an individual and cause significant sleep disturbance are also a reason for evaluation. Medical consultation is particularly important if symptoms occur alongside unusual or concerning signs, such as fever, rash, unexplained weight loss, or abnormal bleeding. In addition, women with risk factors or medical conditions that may complicate treatment decisions, such as a history of breast cancer, heart disease, or clotting disorders, should be carefully assessed before starting therapy.3,9 Finally, those considering either hormone or non-hormonal treatment options should work with a healthcare provider to weigh the potential risks and benefits in the context of their personal health profile.

Here are some practical steps you can try yourself to reduce the impact of vasomotor symptoms

  • Keep a symptom diary to track triggers and frequency. 

  • Use cooling strategies: fans, cold drinks, breathable clothing, dress in layers. 

  • Avoid known triggers (spicy foods, caffeine, alcohol, hot drinks, tight clothing).

  • Stay hydrated.

  • Improve sleep hygiene (consistent sleep schedule; avoiding large meals, caffeine or alcohol before bed; make bedroom dark, cool and comfortable).

  • Practice relaxation and stress management techniques. 

  • Quit smoking.

  • Exercise and maintain a healthy weight.

  • Seek support from healthcare providers, family or menopause support groups. 

Summary

Vasomotor symptoms (hot flashes, night sweats, and sometimes chills) are a hallmark of menopause, experienced by most women. They can be mild and manageable, or severe and life-disrupting.

The good news is there are many strategies, from self-care and lifestyle changes to medications, that can help significantly reduce the frequency and severity of symptoms. What works best depends on your health, preferences, how bothersome symptoms are, and your personal risk profile.

If the symptoms are mild and manageable, non‐medical strategies may be enough. If symptoms affect your sleep, mood, work, or health, consult your healthcare provider to explore options tailored to you.

If you’d like to read more, please check out other resources we trust:

Canadian Menopause Society – Menopause Symptoms

The Menopause Society – Hot Flashes Triggers, Symptoms & Treatments

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  1. The Menopause Society- The 2023 nonhormone therapy position statement of The North American Menopause Society. Menopause: Vol. 30, No. 6, pp. 573-590  https://menopause.org/wp-content/uploads/professional/2023-nonhormone-therapy-position-statement.pdf
  2. The Menopause Society- The 2022 hormone therapy position statement of The North American Menopause Society. Menopause: Vol. 29, No. 7, pp. 767-794  https://menopause.org/wp-content/uploads/professional/nams-2022-hormone-therapy-position-statement.pdf
  3. Avis NE, Crawford SL, Greendale G, et al. Duration of menopausal vasomotor symptoms over the menopause transition. JAMA Internal Medicine. 2015;175(4):531-539.
  4. Freedman RR, et al. Nonhormone therapies for vasomotor symptom management. Cleveland Clinic Journal of Medicine. 2024;91(4):237-244. https://www.ccjm.org/content/91/4/237
  5. Thurston RC, Joffe H. Vasomotor Symptoms and Menopause: Findings from the Study of Women’s Health Across the Nation. Obstetrics and Gynecology Clinics of North America. 2011;38(3):489-501
  6. Thurston RC, Aslanidou-Vlachos HE, Derby CA, Jackson EA, Brooks MM, Matthews KA, Harlow SD, Joffe H, El Khoudary SR. Menopausal Vasomotor Symptoms and Risk of Incident Cardiovascular Disease Events in SWAN. Journal of the American Heart Association. 2021 Feb2;10(3): e017416.
  7. Society of Obstetricians and Gynaecologists of Canada (SOGC). Clinical Practice Guideline No. 422a: Menopause: Vasomotor Symptoms, Prescription Therapeutic Agents, Complementary and Alternative Medicine, Nutrition, and Lifestyle. 2025. https://sogc.org/common/Uploaded%20files/ACSC/ACSC2025/gui422aCPG2110E.pdf
  8. Yuksel N et al. Prevalence and impact of vasomotor symptoms due to menopause in Canada: A subgroup analysis from an international cross-sectional survey of Women with Vasomotor Symptoms Associated with Menopause (WARM Study) Menopause. 2025;32(1):50-59.
  9. Reed SD, et al. Managing menopause Part 1: Vasomotor symptoms. BC Medical Journal. 2021;63(4):157-162. https://bcmj.org/articles/managing-menopause-part-1-vasomotor-symptoms
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