If hormones feel like a black box, this is the page to start with. There are three worth knowing well.
Oestrogen — the one that does almost everything. Oestrogen is the headline hormone of the female body, and its reach is enormous. It builds the womb lining each cycle, but it also supports bone strength, keeps skin and tissues supple, influences mood and memory, helps regulate body temperature, and supports heart and blood-vessel health. When people talk about menopause symptoms, they're often describing what happens as oestrogen becomes scarce: hot flushes, drier skin, mood shifts, thinning bones. Oestrogen isn't "the period hormone" — it's closer to a whole-body maintenance hormone.
Progesterone — the calming counterbalance. Progesterone rises in the second half of your cycle, after ovulation. Its job is to prepare and steady the womb lining, but it also has a gentle, calming effect on the brain and supports sleep. When progesterone is low — as it often is early in perimenopause, or in cycles where you don't ovulate — many women notice anxiety, irritability, and lighter, more broken sleep. Think of progesterone as oestrogen's steadying partner.
Testosterone — yes, yours too. It surprises many women to learn they produce testosterone, but they do — in smaller amounts than men, yet it's far from trivial. In women, testosterone contributes to libido, energy, mood, motivation, and muscle and bone strength. It declines gradually with age, and that quiet decline can be part of why drive and vitality dip in midlife.
The three above are the reproductive hormones, but two others shape how well you feel day to day, and a guide to hormone health is not complete without them.
Cortisol is your main stress hormone. In short bursts it is useful, it gets you up and moving, but when stress never lets up, chronically high cortisol disrupts sleep, appetite, mood and even how your body handles blood sugar. It also interacts with the reproductive hormones above, which is part of why a stressful stretch can throw your cycle or worsen perimenopause symptoms. See cortisol, stress and your hormones.
Thyroid hormones set the pace of your metabolism — your energy, temperature, weight, mood and heart rate. An underactive or overactive thyroid is common in women, becomes more likely in midlife, and produces symptoms that overlap almost exactly with perimenopause: tiredness, low mood, weight change, brain fog. That overlap is precisely why the thyroid is worth checking rather than assuming everything is "the change."
How they change over a lifetime. In your reproductive years, oestrogen and progesterone rise and fall in a monthly rhythm. In perimenopause that rhythm becomes erratic — the source of so many confusing symptoms. After menopause, oestrogen and progesterone settle at low levels, while testosterone has usually been tapering gently for years.
Here's the empowering part: once you can name what each hormone does, your own experience stops feeling random. The 3 a.m. wake-ups, the mood that turns before your period, the dip in drive — each starts to make sense. And what makes sense is something you can finally do something about.
It is the natural next question, and the honest answer is: sometimes, but not always, and rarely in the way the private testing adverts suggest. In perimenopause, hormone levels swing so much from day to day that a single blood test often says very little, which is why diagnosis usually rests on your symptoms and cycle pattern rather than a number. Testing earns its place for specific questions — ruling out thyroid problems, checking testosterone if libido has dropped, investigating very irregular cycles — and it is far more useful when you know what question you are asking. Our guide on whether to get your hormones tested walks through when it helps and when it is money better kept.
Do women have testosterone?
Yes — in smaller amounts than men, and it supports libido, energy, mood and muscle and bone strength.
What does progesterone do?
It steadies the womb lining after ovulation and has a calming effect that supports sleep.
Keep reading: The first signs of perimenopause · Cortisol and your hormones · Should you get your hormones tested? · 5 habits to balance hormones naturally · Take the free Hormone Quiz