I'm suddenly burning up, what's going on?

This wave is real and it has a physical cause. It often starts in your chest, spreads to your face and neck, your skin flushes, sweat beads, sometimes your heart races. Then it fades, sometimes leaving you chilled. At night it's the same story: you wake up with soaked sheets.

Up to 80% of women go through these vasomotor symptoms (the medical name for hot flashes and night sweats) during the transition to menopause ^[1]. About one in four affected women report a strong impact on their quality of life ^[2]. You're not exaggerating.

If you've been told "it's in your head" or "it's just stress," the science says otherwise. A hot flash is measurable: the widening blood vessels, the rise in skin temperature, the sweating ^[3]. Stress can make it worse, but it isn't the cause.

Another surprise: your periods don't have to stop first. These waves can appear as early as 35 to 40, while your cycles are still regular ^[4][5]. Perimenopause, the transition before periods stop, lasts about 4 to 8 years on average ^[1]. The waves last a median of 7.4 years, sometimes over 11 when they start early ^[6]. You're not too young, and nothing is "wrong" with you.

Picture a thermostat, like the one for your heating. A small brain region does that job for your body: it decides when to cool you down. Estrogen is a bit like its remote control.

In perimenopause, that remote gets glitchy. Estrogen doesn't drop steadily: it rides a rollercoaster, swinging up and down without warning ^[5]. It's these swings, more than the decline, that throw the system off ^[5].

The result: your "thermal comfort zone" shrinks ^[3]. Now the smallest warm-up (a hot room, a coffee, a spike of stress) is enough to cross the line. Your brain thinks you're overheating, when your temperature barely moved, and slams on emergency cooling: dilated vessels, flushed skin, sweat. That's the wave.

Neighboring cells called KNDy neurons fire off false alarms when estrogen swings ^[7]. This is exactly the mechanism targeted by a newer non-hormonal drug, fezolinetant, worth discussing with a doctor depending on your situation ^[7].

Here's how to take back control when a wave rises. No single move is magic, but together they add up.

• Breathe slowly: in for about 4 to 5 seconds, out even more slowly. Paced breathing acts on the nerve circuit that precedes a flush ^[3].
• Work your temperature: dress in layers you can peel off, keep cold water within reach, sleep in a cool room.
• Spot your triggers: alcohol, caffeine, spicy food, an overheated room and stress are the usual suspects ^[8].

Beyond these reflexes, longer-term options exist. Menopausal hormone therapy (MHT) is the first-line and most effective treatment for hot flashes; the transdermal route (a gel or patch on the skin) is preferred for its lower clotting risk, at the lowest effective dose ^{[1][9][12][13]}. When hormones are contraindicated, non-hormonal medicines can be offered ^[9]. Cognitive behavioural therapy (a structured talking approach) eases the distress of the waves, even without lowering their frequency ^[9][14]. You don't have to grit your teeth in silence: a doctor can weigh the option that fits you best.

The vast majority of hot flashes between 40 and 55 are hormonal. But not all, and telling them apart is a form of calm vigilance.

An overactive thyroid, infections or certain medications can mimic a hot flash ^[10]. See a doctor rather than blaming hormones if you notice:

• fever alongside the sweats;
• unexplained weight loss, with no change to your diet;
• drenching night sweats that soak your bedding, unrelated to your cycle;
• marked, lingering palpitations.

A note on age, too. Over 45, a doctor can diagnose perimenopause from your symptoms alone, with no blood test ^[9]. Between 40 and 45, a blood test (FSH) can help ^[9]. Before 40, persistent hot flashes warrant a workup, because premature ovarian insufficiency (the ovaries stopping early, which affects about 1 in 100 women under 40) should be ruled out ^[11].