The science
Fempower's advice comes from a curated clinical knowledge base: 19 perimenopausal symptoms, five hormone drivers, and over ninety specific things to try — each written to be checked, followed up and, if it doesn't work for you, dropped.
symptoms, each with an explanation, timing note and GP script
hormone drivers, weighted per symptom
suggestions across GP, food, movement, sleep, supplements, mind and lifestyle
categories, so advice is never only “try to relax”
Almost everything people call “perimenopause symptoms” traces back to one of these — usually more than one at once.
Usually the first thing to fall in perimenopause, often years before oestrogen. Progesterone is calming — it works on the GABA pathway, the same one that makes you drowsy.
Shows up as
Not simply low — erratic. Levels can spike far above premenopausal peaks and then crash within days. It's the swing, not the level, that produces the worst weeks.
Shows up as
Oestrogen receptors are everywhere — brain, joints, skin, bladder, vaginal tissue. As the baseline drops, symptoms show up in places nobody warned you about.
Shows up as
Cortisol naturally climbs from around 3am. With less progesterone to buffer it, that ordinary rise starts to feel like being jolted awake — and daytime stress hits harder.
Shows up as
Women make and need testosterone. It declines gradually from the thirties and is the driver most often left out of the conversation entirely.
Shows up as
A symptom rarely has one cause. Waking at 3am is weighted 0.9 to low progesterone, 0.6 to cortisol and 0.3 to an oestrogen dip. Fempower leads with the most likely driver and tells you about the others.
The same symptom means different things on day 3 and day 26. The late luteal phase — the week before a period — is treated as the symptom-peak window throughout the app.
The language model reads what you wrote and picks the right entries from the knowledge base. It cannot invent a symptom, a hormone or a suggestion that isn't in there. When it's unavailable, a rule-based engine uses the identical data and the app carries on.
Each one has a follow-up interval and a recorded outcome. Over time your own results outrank the general case — which is the only way personalisation means anything.
Limits
Being clear about the edges is part of being trustworthy. Fempower is a wellbeing and information tool. It is not a medical device and it has not been through regulatory approval as one.
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