Hot Flushes & Night Sweats in Perimenopause: Why They Happen (And What Helps)
Hot Flushes & Night Sweats in Perimenopause
One minute you’re fine.
The next — a wave of intense heat rises through your chest, neck and face.
Your heart races.
You start sweating.
You need layers off immediately.
That’s a hot flush.
At night, the same thing can wake you up — sometimes soaking nightwear and bedding.
That’s night sweats.
They are one of the most recognised symptoms of perimenopause.
And they are hormonal.
What Is a Hot Flush?
A hot flush is:
▫️A sudden feeling of intense heat
▫️Often starting in the chest or face
▫️Lasting from seconds to several minutes
▫️Sometimes accompanied by sweating and a racing heart
Night sweats are the same mechanism — just happening during sleep.
They fragment sleep and contribute to fatigue.
Why Do Hot Flushes Happen in Perimenopause?
The exact mechanism isn’t fully understood. But falling and fluctuating oestrogen plays a key role.
Oestrogen helps regulate the hypothalamus — the brain’s temperature control centre. When oestrogen levels fluctuate:
▫️The brain becomes more sensitive to small temperature changes
▫️The “thermostat” narrows
▫️Minor changes trigger a heat response
Your body reacts as if it needs to cool down urgently — even when it doesn’t.
Why Do Night Sweats Disrupt Sleep So Much?
Night sweats:
▫️Raise heart rate
▫️Trigger adrenaline
▫️Activate the nervous system
Even if you fall back asleep, the stress response fragments deep sleep. This contributes to:
▫️Morning fatigue
▫️Brain fog
▫️Mood instability
It’s not just about heat — it’s about nervous system activation.
Practical Ways to Reduce Hot Flushes & Night Sweats
You cannot always eliminate them instantly.
But you can reduce frequency and intensity.
1. Dress in Layers
Light layers allow quick adjustment.
Natural fabrics such as cotton are more breathable.
Avoid tight synthetic materials that trap heat.
2. Keep Your Environment Cool
▫️Use fans or open windows
▫️Lower bedroom temperature
▫️Choose breathable bedding
A cool sleep environment makes a measurable difference.
3. Identify Triggers
Common triggers include:
▫️Alcohol
▫️Caffeine
▫️Spicy food
▫️Stress
▫️Overheated rooms
Tracking patterns can help identify personal triggers.
4. Stay Hydrated
Dehydration worsens temperature instability.
Drink water consistently throughout the day.
5. Manage Stress
Stress increases cortisol. Higher cortisol increases hot flush frequency in some women. Helpful tools:
▫️Walking outdoors
▫️Strength training
▫️Breath work
▫️Yoga
▫️Meditation
Reducing stress lowers nervous system reactivity.
6. Stabilise Blood Sugar
Large glucose swings can increase sympathetic nervous system activation.
Balanced meals and adequate protein support stability.
7. Consider Hormone Replacement Therapy (HRT)
HRT is one of the most effective treatments for hot flushes and night sweats. By stabilising oestrogen levels, many women experience:
▫️Fewer flushes
▫️Reduced night sweats
▫️Improved sleep
This is a medical decision to discuss with your GP.
What If You Cannot or Choose Not to Use HRT?
Some women explore non-hormonal options. Evidence varies, but options sometimes discussed include:
▫️Cognitive behavioural therapy (CBT) for menopause
▫️Certain prescription non-hormonal medications
▫️Magnesium
▫️Phytoestrogens (plant-based compounds)
Always consult your GP before starting supplements.
Underlying causes must be ruled out first.
When to Speak to Your Doctor
Seek medical advice if:
▫️Hot flushes are severe
▫️Night sweats are soaking regularly
▫️Symptoms are affecting daily life
▫️You have additional symptoms such as unexplained weight loss or persistent fever
Your GP can rule out other causes and discuss treatment options.
FAQ Section
Are hot flushes normal in perimenopause?
Yes. They are one of the most common symptoms caused by fluctuating oestrogen levels.
Why do night sweats wake me up?
They activate your nervous system and raise heart rate, fragmenting sleep.
Can HRT stop hot flushes?
HRT is one of the most effective treatments for reducing flushes and night sweats.
How long do hot flushes last?
Duration varies. For many women, they improve once hormones stabilise post-menopause.
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