Symptom · Cardiac & vasomotor
A racing heart out of nowhere. Skipped beats. The 3 a.m. thud.
Palpitations are one of the most under-named perimenopause symptoms. Most women are sent straight to a cardiologist (rightly), get a clean bill of health (good), and are then sent home with no explanation (the part we can fix). The hormone story usually wasn't on the table.
Educational · not medical advice
An estimated 40 to 60 per cent of women report new palpitations across perimenopause. They tend to arrive in clusters: a few weeks of skipped beats and a thudding chest, then quiet for months. They're often loudest at night, when the room is silent and there's nothing to drown them out. Most are benign and hormonally driven, but 'most' is not 'all' — palpitations are one of the few midlife symptoms where it's worth getting a baseline cardiac workup early, then coming back to the hormone conversation with the heart cleared.
Why this is happening now
Estrogen and progesterone modulate the autonomic nervous system, the heart's electrical conduction, and vascular tone. As they swing, so does the rhythm.
- 01
Estrogen swings change autonomic tone
Estrogen has a calming effect on the sympathetic nervous system. As levels rise and fall unpredictably in perimenopause, the balance between sympathetic (fight-or-flight) and parasympathetic (rest) tone shifts, and the heart feels every shift.
- 02
Palpitations often travel with hot flashes
A vasomotor episode is a sympathetic surge. The heart rate jumps 8 to 16 beats per minute during a hot flash and can stay elevated for several minutes after. If your palpitations cluster around flushes, that's the mechanism.
- 03
The 3 a.m. wake-up cluster
Many women describe waking at 3 a.m. with a thudding heart, often after a night sweat. Cortisol naturally rises in the second half of the night; in perimenopause that climb is steeper and the heart goes along for the ride.
- 04
Anxiety and palpitations feed each other
A skipped beat is alarming. The fear amplifies the next one. A loop forms. Naming the loop usually shrinks it; the palpitations are still hormonal, the spiralling is the part you can interrupt.
- 05
Thyroid and iron deserve a check
Perimenopause is also the typical age for new thyroid disease, and many women run low on iron from heavy bleeding. Both cause palpitations. A basic panel (TSH, ferritin, full iron studies) should be part of the workup before anything is blamed on hormones alone.
- 06
Caffeine, alcohol and stimulants hit harder
The same coffee that didn't bother you at 38 can now buy you an afternoon of skipped beats. Alcohol is a common trigger, especially the second drink and especially before bed. Decongestants and some asthma inhalers do the same.
What tends to help
Most palpitations settle when the autonomic system is settled and the obvious provokers are removed. The cardiac workup comes first; everything below assumes a clean baseline.
Get the baseline cardiac check, then come back to hormones
A resting ECG and a one-week event monitor (or a smartwatch ECG capture during an episode) is the standard first move. Most reports come back as benign ectopic beats. Once that's documented, the conversation can shift to hormones, sleep and stimulants without the cardiac question still hanging.
Slow exhale, twice as long as the inhale
A 4-second inhale, 8-second exhale, repeated for 90 seconds, activates the vagus nerve and drops heart rate within a couple of cycles. It's the single most reliable in-the-moment tool. Not a cure; a circuit-breaker.
Splash cold water on the face during an episode
The mammalian dive reflex slows the heart by 10 to 25 per cent within seconds. Sounds gimmicky, works. A cold flannel across the eyes and forehead does the same.
MHT (HRT) helps for many
When palpitations cluster with hot flashes and night sweats, treating the vasomotor symptoms with menopausal hormone therapy often quiets the heart symptoms too. Not a primary indication on its own, but a real downstream benefit worth raising with a menopause-trained doctor.
3 more practices, plus podcasts, books and research, live in Go deeper below.
03When to get help nowWhen it's not just menopause
Emergency red flags, same-week signs, and where to find a menopause-trained practitioner.
When it's not just menopause
5 more signs it needs a doctor this week
Chest pain, breathlessness or fainting with the palpitations
Same-day care, not next week. Could be an arrhythmia that needs treating, could be cardiac ischaemia, could be something else entirely. Don't drive yourself; call for help.
A racing, regular, very fast rhythm that won't stop
Sustained tachycardia (over 150 bpm at rest) lasting more than a few minutes deserves a same-day ECG. Often supraventricular tachycardia, which is treatable.
An irregular rhythm in someone over 50, especially with breathlessness
Atrial fibrillation becomes more common after menopause and the symptoms (irregular pulse, fatigue, breathlessness on exertion) overlap with vasomotor symptoms. A 30-second smartwatch trace plus a doctor's review is the easy path to a clear answer.
Personal or family history of cardiac disease, sudden death, or a known heart condition
The threshold for investigation is lower. Mention the family history at the first appointment so the workup is appropriately thorough rather than reassuring-by-default.
Palpitations interfering with sleep most nights
Even when benign, a heart that won't let you sleep is a treatment problem. Bring it back to the menopause-trained doctor; addressing vasomotor symptoms or trialling MHT is often the answer.
Go deeper
One place for everything else.
Practices to try this week, voices worth hearing, books worth your bedside table, rooms where members are talking, the candid tips Nila would share over a cup of tea, and the research the editorial team is watching.
When in the cycle (if you still have one)
Many women's palpitations cluster in the late luteal phase (the week before a period) and around ovulation. Tracking for two cycles makes the pattern visible and points toward the hormone story rather than the cardiac one.
What was happening just before
Hot flash, night sweat, coffee, wine, big meal, lying down, standing up, a stressful email, nothing at all. The trigger column is what tells the cardiologist whether they're looking at a rhythm problem or an autonomic one.
Duration and rhythm
Seconds and irregular = usually ectopic beats. Minutes and regular and very fast = worth a same-week ECG. A smartwatch single-lead ECG taken during an episode is gold for the cardiologist.
Ferritin, TSH, and a recent blood pressure reading
Bring numbers, not adjectives. If ferritin is below 50 ng/mL or TSH is outside range, palpitations have a better answer than 'it's perimenopause'.
Related