Understanding your hormones during menopause

Hormones

Understanding your hormones during (peri)menopause

Your reproductive hormones do not simply switch off at menopause. They shift gradually, across years, influencing mood, sleep, energy, and more. Here is what is actually happening and when.

Four hormones shape the menstrual cycle and the transition to menopause: oestradiol, progesterone, luteinising hormone (LH) and follicle-stimulating hormone (FSH). Each has its own role. Each changes as the ovaries become less active.

These changes rarely follow a straight line. Hormone levels can swing widely during perimenopause before settling lower after menopause. Knowing how hormones change during menopause, and when, can help you make sense of your body and recognise when to ask for support.

Sex hormone levels change throughout the menstrual cycle.

Hormones during the menstrual cycle

The menstrual cycle has two main phases, each with its own hormonal pattern. The follicular phase starts on the first day of your period. The luteal phase follows ovulation. Timing and experience vary from woman to woman.

The follicular phase

FSH stimulates follicles in the ovaries to grow, each holding an immature egg. Usually one becomes dominant and matures, producing more and more oestradiol.

Oestradiol, the main form of oestrogen during the reproductive years, rebuilds the uterine lining. It also acts on the brain, where it influences mood and cognitive function. Some women notice changes in energy, motivation or mood as it rises. These experiences vary and cannot be predicted from hormone levels alone [1, 2].

Towards mid-cycle, rising oestradiol triggers a surge in LH. This surge leads to ovulation, when the mature egg is released.

The luteal phase

After ovulation, the empty follicle becomes the corpus luteum. It produces progesterone and some oestradiol. Progesterone prepares and maintains the uterine lining. Its metabolites also act on brain receptors involved in sleep and mood. Effects differ between individuals, and higher progesterone does not necessarily mean better sleep or a steadier mood [3].

Without a pregnancy, the corpus luteum breaks down. Progesterone and oestradiol fall, the uterine lining sheds, and a new cycle begins.

Premenstrual changes in mood, sleep, appetite and concentration often coincide with this drop. They depend on how a woman responds to hormonal fluctuations, not simply on whether levels are high or low [3, 4].

What changes during perimenopause

Perimenopause is the transition leading up to menopause. The ovaries respond less consistently to the signals that regulate the cycle, and perimenopause hormones become harder to predict [5, 6].

Ovulation happens less regularly, so progesterone production varies. Oestradiol can rise and fall sharply, sometimes reaching levels as high as or higher than in earlier years before declining later in the transition. FSH often rises, sometimes considerably, as the brain keeps signalling the ovaries to develop follicles. LH can fluctuate too. This is why cycles may become shorter, longer, heavier, lighter or less predictable [5, 6].

Some women experience hot flashes, night sweats, and changes in sleep, mood, concentration or sexual health. Others notice little. Age, individual sensitivity and other health factors shape the experience alongside hormones. Perimenopause can last several years, and it feels different for everyone [8, 9].

Oestrogen levels change throughout perimenopause, menopause and postmenopause.

Menopause and postmenopause

Menopause is a single point in time. It is confirmed after twelve consecutive months without a period, when no other cause explains the absence. For most women it occurs naturally between the ages of 45 and 55 [6, 8].

By then, the ovaries have largely stopped releasing eggs and producing oestradiol and progesterone at reproductive levels. FSH and LH stay high because the brain keeps signalling ovaries that no longer respond in the same way [5, 6].

For women over 45 with typical symptoms and menstrual changes, menopause is usually identified from their history rather than a blood test. Hormone levels fluctuate so much during perimenopause that a single result says little about where someone is in the transition [7].

Postmenopause covers the years that follow. Oestradiol and progesterone stay low, and FSH and LH stay elevated. Other tissues continue to produce small amounts of oestrogens [8]. Some symptoms ease over time. Others persist or first appear after the final period, such as vaginal and urinary symptoms linked to low oestrogen. There is no fixed timeline [8, 10].

What these shifts mean for the body

Hormones act across many systems, so the menopause transition can affect far more than your cycle. Changes in oestrogen signalling are involved in hot flashes and night sweats. Lower oestrogen affects vaginal and urinary tissues, skin and bone. Sleep, mood, concentration and sexual wellbeing may also change, although several factors contribute [8, 9].

None of this is a personal failing. For some women, symptoms barely touch daily life. For others, poor sleep, hot flashes or mood changes make work, relationships and routines harder. Understanding the process helps you choose the support that fits.

Bone deserves particular attention, as bone loss accelerates around the menopause transition [11]. Age and other risk factors also shape cardiovascular and metabolic health in the years after [12]. Vitamin D contributes to the normal absorption and utilisation of calcium and phosphorus, and vitamin K contributes to the maintenance of normal bones [13]. Calcium intake, physical activity and individual risk factors also matter. If you are concerned about your bones or considering supplements, speak with a healthcare professional.

Regular movement, enough protein, a varied diet, restorative sleep and ways to manage stress all support general health through this transition. They do not prevent every symptom or replace treatment when it is needed.

In short

Oestradiol, progesterone, LH and FSH regulate the menstrual cycle and change throughout the menopause transition. During perimenopause, hormone levels fluctuate and cycles become less predictable. Menopause is confirmed after twelve months without a period. Postmenopause brings lower oestradiol and progesterone and higher FSH and LH. These hormonal changes during menopause explain much of what women notice, but symptoms vary widely. Understanding them is a starting point for finding care that suits you.

FAQ

Which hormone is most responsible for hot flashes? Changes in oestrogen play a central role. Fluctuating and declining oestrogen affects the brain's temperature-regulation centre. Other factors influence how often hot flashes occur and how intense they feel [9].

Why do FSH levels rise during menopause? FSH is made by the pituitary gland and signals the ovaries to develop follicles. As ovarian function declines, the ovaries respond less to this signal. The brain produces more FSH in response, so levels rise during the transition and stay high afterwards [5, 6].

Can I test my hormone levels? Blood tests can measure FSH, LH and oestradiol, but results need context. Levels fluctuate during perimenopause, so one test may not reflect the wider picture. For women over 45 with typical symptoms, menopause is usually identified from symptoms and menstrual history. A healthcare professional can advise whether testing makes sense for you [7].

How does progesterone affect mood and sleep? Progesterone and its metabolites act on brain systems involved in sleep and mood. Some women notice changes as levels shift, but the effects vary. Progesterone levels alone do not explain premenstrual symptoms or sleep changes [3, 4].

Can lifestyle habits support health during the menopause transition? Yes. Regular movement, nutritious food, enough sleep and stress management support general health, bone strength and wellbeing. They do not stop the hormonal transition or guarantee symptom relief. If symptoms affect your quality of life, medical support is worth exploring [8, 11].

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This article is for informational purposes only and is not medical advice.

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