If a wave of anxiety has shown up in your 40s seemingly from nowhere — a racing mind at 4 a.m., a shorter fuse, dread without a clear cause — it's worth knowing this is a recognised feature of perimenopause, not a personal failing.
Why it happens. Oestrogen helps regulate serotonin and dopamine — the brain chemicals tied to mood and a sense of calm. As oestrogen swings unpredictably through perimenopause, those systems wobble too. Progesterone matters just as much: it has a naturally soothing, almost sedative effect, and as it falls, many women lose a layer of built-in calm. Add broken sleep and a more reactive stress response, and anxiety has the perfect conditions to flare.
It often feels different from earlier anxiety. Women frequently describe it as more physical (a thudding heart, tight chest) and more sudden — sometimes tied to the days before a period, when hormones dip most steeply.
A pounding heart and a tight chest at 4 a.m. frighten many women into wondering whether it is their heart rather than their hormones. It is a fair question, and worth knowing how the two usually differ. A panic attack tends to come on suddenly, peak within about ten to twenty minutes, and ease as it passes, especially with slow breathing. A heart problem more often feels like pressure or squeezing, may spread to the arm, jaw, neck or back, and tends to persist or worsen rather than settle.
One thing matters specifically for women: a woman’s heart symptoms can be quieter and less "classic" than a man’s, showing up as jaw or back pain, nausea, or breathlessness rather than dramatic chest pain, and women are more often under-diagnosed as a result. So the safe rule is simple: if symptoms are new, severe, different from any anxiety you have had before, or you are simply unsure, treat it as urgent and seek medical help. No clinician will mind. When it turns out to be anxiety, that is good news, not wasted time.
What helps:
One thing worth checking before assuming anxiety is purely hormonal: the thyroid. An overactive thyroid produces almost the same picture — a racing heart, restlessness, poor sleep, irritability — and it becomes more common in midlife, so it is easily mistaken for perimenopausal anxiety. It is a simple blood test, and if it is the cause, it is very treatable. Worth asking your GP to include it.
The long-term habits above lower the baseline, but they do not help at 3 a.m. when your heart is racing. In the moment, the aim is to signal safety to an over-revved nervous system, and slow breathing is the most reliable way to do it: breathe in gently for a count of four, out for a count of six or more, so the out-breath is longer than the in-breath, and repeat for a few minutes. A longer exhale nudges the body out of fight-or-flight. Cool air on the face, naming five things you can see, or getting up and moving gently can all help the wave pass. It will pass.
When to seek more. If anxiety is affecting your daily life, talk to a clinician. For some women, treating the underlying hormonal shift — including HRT — eases mood symptoms significantly; for others, talking therapies or other support are the right path. This is treatable, and you deserve to feel like yourself.
Can perimenopause cause anxiety even if I've never been anxious before?
Yes — new-onset anxiety in the 40s is common and often linked to fluctuating oestrogen and falling progesterone.
Does anxiety improve after menopause?
For many women it eases as hormones settle into a steadier postmenopausal baseline, though good sleep and stress habits help throughout.
Keep reading: The first signs of perimenopause · How hormones hijack your sleep · Cortisol and your hormones · Take the free Hormone Quiz