Why Menopause Affects Your Whole Body — Where Oestrogen, Progesterone and Testosterone Work

You wake up sore. Your sleep is broken. Your fuse is short. Your brain feels foggy. Your bladder is more urgent. Your joints ache for no reason. Your hair is thinner. You feel like you are dealing with a different problem every day of the week.

You are not. You are dealing with one problem, showing up in many places.

First — what are hormones?

Hormones are your body's chemical messengers. They are made in one place — usually a gland — and travel through your bloodstream to act on cells elsewhere. The cells that respond are the ones with a matching receptor for that hormone, like a lock that only opens to the right key.

Oestrogen, progesterone, and testosterone are not just reproductive hormones. They reach receptors in tissues across almost every system of your body. When the hormones change in menopause, every tissue with a receptor for them changes too. Once you see how interconnected they are, the chaos starts to make sense.

Oestrogen — the most wide-reaching hormone

Oestradiol, your main oestrogen during your reproductive years, is made primarily in the ovaries, with smaller amounts produced by the adrenal glands and fat tissue. It has receptors in over 400 tissues throughout your body. The ones that matter most for menopause symptoms:

Brain — mood, memory, sleep, and the blood flow that supplies your thinking. (Brinton 2009.) This is the science behind brain fog.

Bones — oestrogen keeps the constant process of bone breakdown and rebuilding in balance. The fastest rate of bone loss happens in the two years before your final period.

Heart and blood vessels — oestrogen supports the production of nitric oxide, a small molecule your blood vessels use to relax and stay flexible. When oestrogen falls, nitric oxide production decreases, and arteries become stiffer. (Mendelsohn & Karas 1999.) This is part of why women lose their cardiovascular protection after menopause.

Joints, muscles, and tendons — oestrogen supports collagen production, which gives strength and structure to your tissues. It also influences how your nervous system processes pain. When oestrogen falls, collagen slows and pain perception can shift — which is why so many women in perimenopause develop unfamiliar joint pain and frozen shoulders. (Chidi-Ogbolu & Baar 2019.)

Vagina, vulva, bladder, and urethra — these tissues depend on oestrogen for thickness, elasticity, and lubrication. When they thin and dry in menopause, the condition is called the genitourinary syndrome of menopause, or GSM. (NAMS 2020.)

Progesterone — the calming hormone

Progesterone is made in the ovaries after ovulation, with smaller amounts produced by the adrenal glands. It has two main areas of action. The uterus is one — it stabilises the lining, which is why women with a uterus who take oestrogen also take progesterone.

The brain is the other. Progesterone acts on GABA receptors, the same receptors targeted by many anti-anxiety and sleep medications. (Schussler 2008.) This is why so many women describe progesterone at night as calming — not just a hormone, but a sleep aid that happens to be a hormone.

Testosterone — not just a "male" hormone

Testosterone is made in three places: your ovaries, your adrenal glands, and out in your body's tissues from another hormone called androstenedione. (Jones 2024.) Molecule for molecule, women produce more testosterone than oestrogen — something most women have never been told.

Testosterone receptors sit in your bones, your muscles, your brain, and your pelvic floor — as well as the tissues involved in libido and sexual response. (Casperson 2024.) This is why many women in mid-life feel a quieter, harder-to-name loss — less drive, less strength, less get-up-and-go — alongside the more obvious oestrogen-driven symptoms.

Did you know?

When a woman describes broken sleep, mood changes, joint pain, brain fog, vaginal dryness, and low libido all at the same time, she is not exaggerating. She is describing a single hormonal shift, showing up in every tissue with a receptor for the hormones that are changing.

Three takeaways

1. Hormones are chemical messengers. They act on any cell in the body with a matching receptor — which is why one hormonal shift can show up in many places at once.

2. Oestrogen has receptors in over 400 tissues. Progesterone acts powerfully on the brain via GABA. Testosterone is made in three places, not one — and matters for women across bones, muscle, mood, libido, and pelvic floor.

3. When these hormones change in menopause, every tissue with a receptor for them changes too. That is why symptoms appear everywhere at once.

This is not your body failing you. It is your body changing — and asking for a different kind of support.

Start by noticing which body systems your symptoms cluster in. There are over 40 documented symptoms of perimenopause — most women have never seen the full list.

Want the full symptom list?

Download the free Menopause Hub Symptom Checklist:

This information is educational only and does not constitute personal medical advice. Always consult a qualified health professional about your individual circumstances.

© 2026 Menopause Hub | Anna Pattison | menopausehub.com.au

References

Brinton RD. Estrogen-induced plasticity from cells to circuits. Trends Pharmacol Sci 2009;30(4):212-22.

Mendelsohn ME, Karas RH. Protective effects of estrogen on the cardiovascular system. N Engl J Med 1999;340(23):1801-11.

Manson JE, et al. WHI extended follow-up. JAMA 2017;318(10):927-938.

Chidi-Ogbolu N, Baar K. Effect of estrogen on musculoskeletal performance. Front Physiol 2019;9:1834.

NAMS. Genitourinary syndrome of menopause position statement. Menopause 2020;27(9):976-992.

Schussler P, et al. Progesterone in sleep EEG. Psychoneuroendocrinology 2008;33(8):1124-31.

Jones C. Hello Hormones podcast (2024).

Casperson K. You Are Not Broken podcast (2024).