Heatwaves and Perimenopause: Why Hot Weather Can Make Your Symptoms Worse (and What You Can Do About It)
- Michaela Newsom
- 1 day ago
- 20 min read
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TABLE OF CONTENTS
Why Heatwaves Are Becoming a Bigger Women's Health Issue
For many women, heatwaves don't simply feel uncomfortable—they can become a genuine health challenge. As our climate changes, periods of extreme heat are becoming more frequent, lasting longer and reaching higher temperatures than we've experienced historically. The UK Met Office predicts that heatwaves similar to those once considered rare are likely to become increasingly common over the coming decades. At the same time, around one in three women in the UK is either perimenopausal or postmenopausal, creating an important but often overlooked public health issue.
Historically, research into heat-related illness has focused on older adults, outdoor workers and people with chronic medical conditions. Far less attention has been given to women experiencing the menopause transition, despite growing evidence that declining oestrogen changes the body's ability to regulate temperature. Emerging research suggests that menopausal women may represent a particularly vulnerable group during periods of extreme heat.
Why Women in Midlife May Be More Vulnerable
Heat places significant demands on almost every physiological system. To maintain a stable core temperature, the body must increase blood flow to the skin, produce sweat, redistribute fluids and work harder to maintain blood pressure and circulation. These adaptations depend upon healthy cardiovascular function, efficient nervous system signalling and adequate hydration.
Perimenopause changes many of these same systems. Declining oestrogen influences:
thermoregulation within the hypothalamus
blood vessel function
autonomic nervous system activity
cardiovascular responses
fluid balance
sleep quality
metabolic flexibility
inflammatory signalling.
This means that women entering midlife may have a reduced physiological reserve when faced with prolonged environmental heat. For many, this doesn't lead to serious illness, but it can significantly increase symptom burden and reduce quality of life.
The Hidden Cost of Heat
The effects of prolonged heat often extend far beyond hot flushes.
Women frequently report:
worsening fatigue
reduced productivity at work
impaired concentration
poorer decision making
increased irritability
disturbed sleep
reduced exercise capacity
less motivation to socialise
lower overall wellbeing.
Sleep disruption deserves particular attention. Night-time temperatures have risen alongside daytime temperatures, making it increasingly difficult for the body to lose the heat required for restorative sleep. Since poor sleep also worsens anxiety, insulin resistance, appetite regulation and cognitive function, many women become trapped in a cycle where one hot night leads to several difficult days. Over weeks of sustained hot weather, this cumulative sleep debt can have a substantial impact on physical and mental health.
Why Summer Can Suddenly Feel So Much Harder
Perhaps you've noticed that you're the only person opening every window in the house. Your family seem perfectly comfortable while you're desperately searching for a fan, throwing off the duvet at 3 am or avoiding sitting outside because the heat feels unbearable.
Or perhaps you've booked a summer holiday only to discover that the destination you've always loved suddenly leaves you exhausted, anxious and unable to sleep. If this sounds familiar, you're certainly not imagining it.
Many women report that their perimenopause symptoms become dramatically worse during periods of hot weather. Heatwaves can intensify hot flushes, night sweats, fatigue, dizziness, headaches, poor concentration, anxiety and disturbed sleep. Even women who have never considered themselves sensitive to heat often find they struggle to tolerate temperatures they previously enjoyed.
This isn't simply because your hormones are changing. It's because those hormonal changes alter one of the brain's most fundamental jobs: regulating your body temperature. Understanding why this happens is important because it explains why seemingly small changes in weather can have such a profound impact on how you feel.
Why Does Hot Weather Affect Perimenopause?
Humans maintain a remarkably consistent core body temperature of around 37°C. Even small deviations can interfere with enzyme activity, energy production and normal cellular function, so the body works continuously to keep temperature within a very narrow range. This process is known as thermoregulation.
Your body is constantly monitoring information from temperature receptors in your skin and internal organs before sending this information to the hypothalamus — the brain's thermoregulatory centre.
When you're too cold it initiates responses such as shivering, narrowing blood vessels in the skin and increasing heat production.
When you're too warm it does the opposite:
widening blood vessels (vasodilation)
activating sweat glands
increasing blood flow to the skin
encouraging behavioural changes such as seeking shade or removing clothing.
Most of the time this system works so efficiently that you're completely unaware of it. During perimenopause, however, that finely tuned thermostat becomes much more sensitive. Although oestrogen does not directly control body temperature, it plays an important modulatory role within the hypothalamus. Oestrogen influences the activity of specialised neurons involved in heat sensing and heat dissipation, helping the body maintain a stable core temperature despite changes in the external environment. As oestrogen levels fluctuate during perimenopause, these neural circuits become more sensitive, making the body more likely to activate heat-loss responses such as skin vasodilation and sweating.
The Hidden Brain Changes Behind Hot Flushes
For many years researchers believed hot flushes were simply caused by falling oestrogen levels.
We now know the story is considerably more interesting.
Modern neuroscience has shown that specialised nerve cells within the hypothalamus—known as KNDy neurons—play a central role in regulating body temperature.
These neurons communicate using three signalling molecules:
Kisspeptin
Neurokinin B
Dynorphin
Together they help regulate reproductive hormones, but they also communicate closely with the brain's temperature control centre.
Oestrogen normally acts as a brake on these neurons. As oestrogen begins to fluctuate during perimenopause, this braking effect weakens. The KNDy neurons become increasingly active and send stronger signals to the thermoregulatory centres of the hypothalamus.
One consequence is that the thermoneutral zone becomes much narrower. The thermoneutral zone is the small temperature range within which your body feels comfortable and doesn't need to activate cooling or warming responses. In younger women this zone is relatively wide. During perimenopause it narrows dramatically. That means even a tiny increase in body temperature—sometimes less than half a degree Celsius—can convince your brain that you're overheating.
Your body responds with an emergency cooling programme:
rapid widening of blood vessels
increased heart rate
sweating
flushing of the face and chest
feelings of intense heat
occasionally chills afterwards as body temperature falls.
Importantly, your core temperature often hasn't risen very much at all. Your brain is simply responding as though it has.
Why Heatwaves Can Make Symptoms Worse
Now imagine this already-sensitive thermostat during a summer heatwave. Instead of starting the day comfortably within your thermoneutral zone, you're much closer to its upper limit before you've even had breakfast. Small additional triggers that previously wouldn't have mattered can now push your brain beyond its threshold. These include:
walking upstairs
drinking a hot coffee
eating a spicy meal
enjoying a glass of wine
feeling stressed
sitting in direct sunshine
exercising
sleeping under a warm duvet.
Each one adds a tiny amount of heat to your body. For someone whose thermoneutral zone has narrowed, those small increases are enough to trigger repeated hot flushes throughout the day. This helps explain why many women experience a vicious cycle during hot weather. The higher the environmental temperature becomes, the more frequently cooling mechanisms are activated, resulting in more flushing, more sweating and greater disruption to everyday life.
It's Not Just Hot Flushes
One of the biggest misconceptions about menopause is that heat only affects hot flushes. In reality, elevated temperatures influence almost every symptom women commonly experience during perimenopause. That's because cooling the body requires major adjustments throughout your physiology.
Blood vessels widen to increase heat loss through the skin.
Your heart pumps harder to maintain blood pressure.
Sweat glands become highly active, increasing losses of water and electrolytes.
The nervous system shifts its priorities towards cooling and maintaining circulation.
If you're already experiencing fluctuating hormones, poor sleep, elevated stress levels or metabolic changes, these additional demands can leave you feeling surprisingly depleted.
Many women therefore notice:
worsening fatigue
poorer concentration
increased irritability
reduced exercise tolerance
headaches
dizziness when standing
faster heart rate
increased anxiety
poorer sleep.
These symptoms are not separate problems. They're often different expressions of the same physiological challenge: maintaining internal balance while trying to regulate body temperature in an already sensitised system.
Why Some Women Struggle More Than Others
Not every woman experiences menopause in the same way. Some barely notice hot weather, while others feel almost incapacitated during a heatwave.
Research suggests several factors influence heat tolerance during the menopause transition, including:
stage of perimenopause
frequency of vasomotor symptoms
cardiovascular fitness
body composition
sleep quality
psychological stress
metabolic health
hydration status
medications
underlying medical conditions.
From a functional medicine perspective, we would also consider factors that influence your body's resilience and ability to adapt to stress. For example, chronic sympathetic nervous system activation, insulin resistance, mitochondrial dysfunction, chronic inflammation and nutrient deficiencies may all reduce your physiological reserve, meaning the body has fewer resources available to cope with additional environmental stress such as extreme heat.
While these factors don't directly cause hot flushes, they can make the overall experience of perimenopause considerably more challenging.
Why Heat Makes You Feel So Tired
Many women tell me they don't just feel hot during a heatwave—they feel completely unlike themselves. They become more anxious. Their heart races. Their sleep deteriorates. Their energy crashes by mid-afternoon, their head feels fuzzy and they struggle to concentrate. Even simple tasks can suddenly feel overwhelming.
These symptoms are closely linked. Once you understand what heat is asking your body to do, it becomes much easier to see why so many aspects of wellbeing can be affected during perimenopause.
One of the biggest surprises for many women is just how exhausting hot weather can be. Cooling the body is actually an energy-intensive process. Every time your body temperature rises, your physiology shifts into cooling mode:
Your heart beats faster to circulate warm blood towards the skin.
Blood vessels dilate to increase heat loss.
Sweat glands become active, producing sweat that evaporates from the skin to remove heat.
Your breathing rate may increase slightly, while your kidneys begin adjusting fluid and electrolyte balance to compensate for sweat losses.
Although these processes are automatic, they all require energy.
During perimenopause, your cells may already be producing energy less efficiently. Oestrogen plays an important role in supporting mitochondrial function—the tiny energy-producing structures inside every cell. As oestrogen levels fluctuate and gradually decline, mitochondrial efficiency may decrease, meaning your cells have to work harder to generate the same amount of ATP (energy).
Adding prolonged heat exposure to this picture is a little like asking a car with a partially worn battery to climb a steep hill with the air conditioning running. The result is often profound physical and mental fatigue.
Why Anxiety Often Feels Worse in Hot Weather
Many women notice that anxiety seems to intensify during the summer months. Again, this isn't "just hormonal." Cooling the body is coordingated byt eh atonomic nervous system, which continuloulsy balances cardiovascular function, sweating and blood flow to maintain a stable core temperature.
During heat expoaure, speacialised aympatheti cholinergic nerve fibrese stimulate eccrine sweat glands to produce sweat, while blood vessels supplying the skin dilate to increase heat loss. At the same time, heart rate rises to maintain cardiac output as a greater poroprtion of blood is redirected towards the skin.
Although these responses are entirely normal, they produce physical ssensations including palpitations, warmth, perspiration and light headedness that closely resemble anxiety. Women who are already experiencing fluctuating stress hormones, poor sleep or heightened nervous system sensitivity during perimenopause may therefore perceive heat as significantly more distressing than they previously would have.
In other words, the body experiences heat as an additional physiological stressor. If you've ever found yourself wondering why your anxiety suddenly spirals on a hot day despite nothing stressful actually happening, this is one possible explanation.
Why Brain Fog Gets Worse During Heatwaves
Brain fog is one of the most common complaints during perimenopause. Many women describe feeling as though they're thinking through treacle. Names disappear. Words won't come. Concentration drifts. Decision-making feels harder. Heat can amplify all of these symptoms.
The brain accounts for only around 2% of total body weight but consumes approximately 20% of the body's energy supply. It is also highly sensitive to even modest changes in temperature and hydration.
Studies have consistently shown that dehydration—even losses of as little as 1–2% of body weight—can impair attention, working memory, executive function and reaction time.
At the same time, increased core temperature alters cerebral blood flow and increases the perception of mental effort.
For women already experiencing hormonal changes affecting neurotransmitters such as dopamine, serotonin and acetylcholine, these additional physiological stresses can noticeably reduce cognitive performance. This is why many women report that brain fog is significantly worse during heatwaves than at other times of the year.
The Hidden Role of Dehydration
One of the simplest—but often overlooked—reasons symptoms worsen during hot weather is dehydration. Sweating is essential for cooling the body, but it comes at a cost. Along with water, we lose electrolytes including:
sodium
potassium
magnesium
chloride.
These minerals are essential for virtually every aspect of cellular function. They help regulate:
nerve signalling
muscle contraction
blood pressure
heart rhythm
hydration inside and outside cells
energy production.
Even mild dehydration can reduce blood volume.
With less circulating blood available, the heart has to work harder to maintain blood pressure and deliver oxygen to tissues. This contributes to symptoms such as:
fatigue
dizziness
headaches
palpitations
reduced exercise tolerance
poor concentration.
Many women assume they're drinking enough because they carry a water bottle throughout the day. However, replacing water without replacing electrolytes can sometimes dilute blood sodium levels further, particularly after prolonged sweating. Hydration isn't simply about water. It's about maintaining the right balance of both fluids and minerals.
Why Blood Sugar Can Become More Unstable
Hot weather also influences metabolism. Many women naturally eat less during periods of extreme heat.
Breakfast may become a coffee.
Lunch becomes a salad.
Dinner might not happen until late evening.
Although this feels intuitive, it can unintentionally create long gaps between meals.
If you're already prone to reactive hypoglycaemia or insulin resistance—a common feature during perimenopause—these prolonged periods without adequate protein or complex carbohydrates can lead to fluctuating blood glucose levels.
Low blood sugar triggers the release of stress hormones such as adrenaline and cortisol.
These hormones increase glucose availability but also produce symptoms that overlap with menopause:
anxiety
shakiness
sweating
palpitations
irritability
poor concentration
waking during the night.
Many women assume their hormones are worsening when, in reality, unstable blood sugar is adding another layer of physiological stress.
Why Alcohol Feels Different During Perimenopause
If you've noticed that one glass of wine suddenly affects you far more than it used to, you're certainly not alone.
Alcohol widens blood vessels, increasing heat loss through the skin. While this initially creates a pleasant cooling sensation, it also makes the body work harder to maintain temperature regulation afterwards.
Alcohol also:
increases dehydration
disrupts sleep architecture
increases night sweats
impairs blood sugar regulation
stimulates cortisol release overnight
reduces REM sleep
increases next-day fatigue.
Combined with hot weather and fluctuating hormones, these effects become much more noticeable than they were previously. This doesn't necessarily mean you can never enjoy a drink.
It simply means your physiology has changed, and your body may no longer tolerate alcohol in quite the same way.
A Functional Medicine Perspective: Why Resilience Matters
From a functional medicine perspective, we don't simply ask why you're experiencing symptoms.
We ask why your body is finding it difficult to adapt.
Every heatwave places additional demands on your physiology. For some women, the body adapts quickly. For others, it struggles. The difference often lies in physiological resilience.
From a systems biology perspective, menopause symptoms arise not only because hormone concentrations change, but because multiple interconnected physiological networks lose resilience simultaneously.
Thermoregulation depends upon effective communication between the brain, cardiovascular system, autonomic nervous system, endocrine system, mitochondria and kidneys. If one or more of these systems is already under strain—for example because of insulin resistance, poor sleep, chronic inflammation, nutrient insufficiency or reduced cardiorespiratory fitness—the additional physiological load imposed by a heatwave may exceed the body's adaptive capacity.
In functional medicine, the goal is therefore not simply to reduce symptoms but to improve the resilience of these interconnected biological systems so that the body can respond more efficiently to future stressors.
How to Support Your Body During Heatwaves
The good news is that while you can't change the weather, you can improve the way your body responds to it. The aim isn't simply to stay cool—it's to reduce the physiological burden that heat places on your brain, nervous system, cardiovascular system and metabolism. Small changes can make a surprisingly large difference.
Improve the Cardiovascular Physiology
Heat dissipation depends largely on cutaneous vasodilation. Blood vessels supplying the skin widen, allowing warm blood to move closer to the bodys's surface where heat can be lost through radiation, convection and evaporation. While highly effective, this temporarily reduces central blood volume, requiring the heat to beat faster to maintain blood pressure and ensure adequate blood flow to vital organs.
In susceptible individuals this may contribute to dizziness, light-headedness or exercise intolerance, particularly when dehydration is also present.
Prioritise Hydration – But Don't Forget Electrolytes
One of the biggest mistakes I see during the summer is women dramatically increasing their water intake without replacing the minerals they lose through sweating. Hydration is about far more than replacing lost water. Sweat is hypotonic - it contains proportionally more water than electrolytes - but prolonged sweating still results in meaningful losses of sodium and chloride together with smaller amounts of potassium, magnesium and calcium.
Sodium plays a particularly important role because it helps maintain extracellular fluid volume, supports nerve impusle transmission and assists glucose and water absorption within the small intestine.
Excessive replacement of sweat losses with plain water alone, particularly during prolonged heat exposure or endurance exercise, can dilute plasma sodium concentration further. Although clinically significant hyponatraemia (low blood sodium levels) is uncommon in everyday circumstances, inadequate electrolyte replacement may contribute to fatigue, headaches, dizziness and reduce exercise capacity.
Practical tips
Drink consistently throughout the day rather than waiting until you feel thirsty.
Include mineral-rich foods such as leafy greens, avocados, tomatoes, cucumber, melon and citrus fruits.
Consider an electrolyte drink during prolonged heat exposure, especially if you are exercising or sweating heavily. For everyday hydration or for recovery from light exercise, coconut water is a good choice as it contains a natural hydrating mix of sodium, potassium, magnesium and calcium. However, for heavier workouts or sweating profuously, you may need higher levels of sodium.
If using electrolyte supplements, choose products with minimal added sugar and appropriate levels of sodium. E-lyte by BodyBio mimics the electrolyte composition of the body and is a great choice for every day use whilst LMNT has a higher sodium content and is suitable for intensive workouts or if following a keto diet.
Eat to Stabilise Blood Sugar
Heat exposure itself can also alter glucose regulation. Dehydration increases circulating concentrations of stress hormones such as cortisol and catecholamines, both of which promote hepatic glucose production. Meanwhile, skipping meals because of reduced appetite may trigger reactive hypoglycaemia in susceptible individuals.
During hot weather it's common to lose your appetite however, aim to include:
protein with every meal
healthy fats
colourful vegetables
high-fibre carbohydrates where appropriate.
Protein is particularly important because it slows glucose absorption, supports muscle maintenance and provides amino acids needed for neurotransmitter production.
Good summer options include:
Greek yoghurt with berries and seeds
grilled salmon and salad
chicken with quinoa and vegetables
lentil salads
eggs with avocado
cottage cheese and fruit
Keeping blood sugar stable is one of the simplest ways to reduce unnecessary physiological stress during periods of extreme heat.
Protect Your Sleep
Unfortunately, the body's natural temperature rhythm already becomes less efficient during perimenopause. Normally, core body temperature falls during the evening, helping initiate sleep.
Heatwaves interfere with this process.
When bedroom temperatures remain high, the brain struggles to enter deep restorative sleep, leading to more frequent waking and increased night sweats.
Evidence-based strategies include:
keeping bedrooms below 18–20°C where possible
using fans to improve air circulation
closing curtains during the day to reduce solar heat gain
taking a cool (rather than cold) shower before bed
wearing breathable natural fibres such as cotton or bamboo
avoiding alcohol close to bedtime
limiting heavy meals late in the evening.
Remember that poor sleep doesn't simply leave you feeling tired the next day. It also increases cortisol, impairs glucose regulation, heightens pain sensitivity and reduces emotional resilience, making the following day feel considerably more difficult.
Exercise Smarter, Not Harder
Exercise remains one of the best tools for supporting metabolic health, bone density, cardiovascular function and mood during perimenopause. However, heatwaves aren't the time to push yourself through intense workouts simply because they're in your training plan.
High temperatures increase cardiovascular strain.
Heart rate rises more quickly.
Sweat losses increase.
Perceived effort becomes higher.
Recovery takes longer.
Rather than stopping exercise altogether, adjust it to match the conditions.
During periods of extreme heat consider:
exercising early in the morning or later in the evening
reducing workout intensity
taking longer recovery periods
prioritising strength training over prolonged endurance sessions
choosing shaded routes or indoor air-conditioned environments
replacing fluids and electrolytes afterwards.
Support Your Nervous System
Perimenopause often narrows the window within which the nervous system feels safe and balanced.
Heat narrows it further. Finding ways to encourage parasympathetic ("rest and digest") activity can improve resilience during hot weather.
Research suggests that slow diaphragmatic breathing, mindfulness practices and time spent in nature can all reduce sympathetic nervous system activity. One particularly helpful technique is physiological breathing. Inhale slowly through your nose for four seconds, exhale gently for six to eight seconds and repeat for five minutes. Extending the exhalation stimulates the vagus nerve, encouraging the body to shift away from a stress response.
While this won't stop hot flushes entirely, it may reduce the intensity of the body's response to heat and improve recovery afterwards.
Nutrients That Support Heat Resilience
Although no supplement can prevent menopause symptoms, ensuring nutritional adequacy can help support the systems most affected by heat.
Depending on your individual needs, nutrients that may warrant assessment include:
Magnesium
Supports nervous system function, muscle relaxation, sleep and hundreds of energy-producing reactions.
Omega-3 fatty acids
Help regulate inflammation, support cardiovascular health and maintain healthy cell membranes.
B Vitamins
Essential for mitochondrial energy production and neurotransmitter synthesis.
Vitamin D
Supports immune function, muscle strength and bone health.
Protein
Arguably the most overlooked "nutrient" during perimenopause. Adequate protein supports muscle mass, blood sugar regulation and recovery.
Supplementation should always be individualised and based on dietary intake, symptoms and, where appropriate, laboratory assessment.
Looking Beyond Symptom Management
If you're finding every summer increasingly difficult, it's worth asking whether heat is exposing deeper imbalances rather than causing entirely new problems.
As a functional medicine practitioner, I often investigate factors that influence a woman's resilience, including:
insulin resistance
thyroid function
iron status
vitamin B12 and folate
vitamin D
magnesium status
inflammatory markers
liver health
mitochondrial function
cortisol regulation
gut health and nutrient absorption.
Improving these areas won't change the weather. However, it can increase your body's ability to adapt to environmental stress, making heatwaves considerably easier to tolerate.
When Should You Seek Medical Advice?
Although worsening menopause symptoms during hot weather are common, certain symptoms should always be assessed promptly.
Speak to your GP or seek urgent medical attention if you experience:
chest pain
fainting
persistent rapid or irregular heartbeat
severe dehydration
confusion
difficulty breathing
weakness affecting one side of the body
symptoms of heat stroke, including high body temperature, confusion or loss of consciousness.
Similarly, if hot flushes, night sweats or other menopause symptoms are having a significant impact on your quality of life, it's worth discussing treatment options with a healthcare professional. Lifestyle strategies are important, but they don't replace appropriate medical assessment or evidence-based treatments when needed.
Climate Change Is Changing the Conversation
Climate change isn't only an environmental issue—it is increasingly recognised as a health issue.
The medical community is beginning to acknowledge that certain population groups experience environmental stress differently, and women in midlife are one of them.
Researchers have highlighted the need for greater awareness of how rising global temperatures may disproportionately affect women experiencing vasomotor symptoms, particularly those who also have cardiovascular disease, obesity, diabetes or other chronic health conditions.
A growing body of research has highlighted the intersection between menopause and environmental heat:
Women experiencing frequent vasomotor symptoms have been shown to report significantly greater discomfort during periods of elevated ambient temperature.
Reviews have proposed that climate change may increase the burden of menopausal symptoms worldwide as heatwaves become more common and more intense.
Researchers have called for menopausal women to be recognised as a population requiring greater consideration in future climate adaptation and public health planning.
Although this is still an emerging field of research, the evidence reinforces what many women have known for years: summer really can feel different during perimenopause, and there's a physiological reason why.
There is also growing recognition that many workplaces, public buildings and healthcare settings are not designed with menopausal women in mind. Simple adjustments—such as improving ventilation, allowing access to drinking water, providing flexible uniforms and creating cooler working environments—can make a meaningful difference to comfort, wellbeing and productivity.
Looking Beyond Cooling Strategies
As temperatures continue to rise, simply relying on fans and cold drinks is unlikely to be enough.
Supporting women's health during hotter summers requires a broader approach that considers both environmental factors and the body's internal resilience. This includes optimising metabolic health, maintaining muscle mass, supporting cardiovascular fitness, improving sleep, stabilising blood sugar and addressing nutritional deficiencies—all areas that influence how effectively the body adapts to heat.
From a functional medicine perspective, increasing resilience means giving the body greater capacity to respond to stress, whether that stress comes from hormonal changes, illness, psychological pressures or a week-long summer heatwave.
The conversation around menopause is evolving. Increasingly, we're recognising that symptoms don't occur in isolation. They are influenced by the interaction between our biology, our lifestyle and the environment around us. Understanding that relationship is empowering. Rather than simply enduring another difficult summer, women can take proactive steps to support their physiology, reduce symptom severity and continue enjoying an active, healthy life—even as temperatures rise.
Frequently Asked Questions
Why do I suddenly feel much hotter than everyone else?
During perimenopause, fluctuating oestrogen alters the brain's temperature regulation centre. This narrows your thermoneutral zone, meaning even small increases in body temperature can trigger cooling responses such as sweating and hot flushes.
Can dehydration make hot flushes worse?
Yes. Dehydration reduces blood volume and places additional strain on the cardiovascular system, which may increase fatigue, dizziness, palpitations and the perception of hot flushes.
Should I drink electrolyte drinks every day?
Most women can obtain sufficient electrolytes from a balanced diet. However, electrolyte replacement may be helpful during prolonged heat exposure, heavy sweating or exercise. If you have kidney disease, heart failure or high blood pressure, seek medical advice before using electrolyte supplements regularly.
Does HRT improve heat intolerance?
Hormone replacement therapy is considered one of the most effective treatments for vasomotor symptoms, including hot flushes and night sweats. Whether it is appropriate depends on your individual medical history and should be discussed with your healthcare provider.
Why does alcohol affect me so much more now?
Alcohol widens blood vessels, increases dehydration, disrupts sleep and can destabilise blood sugar. These effects become more noticeable during perimenopause because your body's temperature regulation and stress response systems are already more sensitive.
References and Further Reading
Freedman RR. Menopausal hot flashes: mechanisms, endocrinology, treatment. Journal of Steroid Biochemistry and Molecular Biology. 2014;142:115–120.
Rance NE, Dacks PA, Mittelman-Smith MA, et al. Modulation of body temperature and LH secretion by hypothalamic KNDy neurons. Endocrinology. 2013;154(9):3203–3211.
Padilla SL, Johnson CW, Barker FD, et al. A neural circuit underlying the generation of hot flushes. Cell Reports.2018;24(2):271–277.
Mittelman-Smith MA, Williams H, Krajewski-Hall SJ, et al. Role of kisspeptin/neurokinin B/dynorphin neurons in menopausal vasomotor symptoms. Current Opinion in Physiology. 2022;25:100482.
Santoro N, Epperson CN, Mathews SB. Menopausal symptoms and their management. Endocrinology and Metabolism Clinics of North America. 2015;44(3):497–515.
Ganio MS, Armstrong LE, Casa DJ, et al. Mild dehydration impairs cognitive performance and mood. Journal of Nutrition. 2011;141(8):1535–1543.
Cheuvront SN, Kenefick RW. Dehydration: physiology, assessment and performance effects. Comprehensive Physiology.2014;4:257–285.
Brinton RD. Estrogen regulation of mitochondrial bioenergetics and neuronal survival. Biochimica et Biophysica Acta.2008;1800:105–115.
Armstrong LE, Ganio MS, Casa DJ, et al. Mild dehydration affects mood and cognitive performance in healthy women. Journal of Nutrition. 2012.
North American Menopause Society. The 2023 Nonhormone Therapy Position Statement.
Armstrong LE, Ganio MS, Casa DJ, et al. Mild dehydration affects mood in healthy young women. Journal of Nutrition.2012.
Cheuvront SN, Kenefick RW. Dehydration: physiology, assessment and performance effects. Comprehensive Physiology.2014.
North American Menopause Society. The 2023 Nonhormone Therapy Position Statement.
Maki PM, Kornstein SG, Joffe H, et al. Guidelines for the evaluation and treatment of cognitive symptoms during menopause. Menopause. 2019.
Santoro N, Epperson CN, Mathews SB. Menopausal symptoms and their management. Endocrinology and Metabolism Clinics of North America. 2015.
Spronk I, Kullen C, Burdon C, et al. Relationship between hydration status and cognitive performance. Nutrients. 2021.
Taylor HS, Pal L, Seli E. Speroff's Clinical Gynecologic Endocrinology and Infertility. 10th Edition.
About The Author
Michaela Newsom
Registered Nutritional Therapist, mBANT, rCNHC
Michaela is a women’s health expert with a specialist interest in the impact of menopause on the female brain. Her mission is to empower women to optimise their cognitive function and mental wellbeing throughout life with a special focus on the challenges that take place during perimenopause, menopause and beyond.
With a Postgraduate qualification in Personalised Nutrition and advanced Functional medicine training with IFM and the Kharrizian Institute Michaela has expertise spanning hormones, brain health, cognitive function and mood disorders.
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