Menopause: The Hormones That Support You

To understand menopause, you first need to understand what you are losing.

During a normal menstrual cycle, Oestradiol (the primary oestrogen), Progesterone, and Testosterone rise and fall in a carefully orchestrated pattern. In the follicular phase (days 1-14), oestradiol climbs steadily, peaking just before ovulation. This surge drives a brief spike in LH (luteinising hormone), which triggers the release of an egg. After ovulation, the corpus luteum produces progesterone, which dominates the luteal phase (days 15-28), preparing the uterine lining. Testosterone fluctuates more subtly, with a small rise around ovulation.

The cycle affects more than reproduction. Every one of these hormonal shifts has systemic effects on your brain, bones, cardiovascular system, immune function, and metabolism. The monthly cycle is your body's way of maintaining a hormonal environment that supports many organ systems. When that cycle becomes erratic and eventually stops, the consequences extend far beyond fertility.

The conversation around female hormones is dominated by reproduction. That framing dramatically undersells their importance.

Oestradiol maintains bone mineral density by inhibiting osteoclast activity (the cells that break down bone). It is thought to be cardioprotective: it promotes healthy endothelial function, raises HDL, lowers LDL and may help regulate blood pressure. It supports skin elasticity, joint lubrication, and bladder function. In the brain, oestradiol enhances serotonin and dopamine activity, supporting mood, memory, concentration, and sleep quality. Laboratory research suggests it is neuroprotective, although whether declining levels at menopause raise the risk of dementia is still uncertain.

Progesterone is far more than a pregnancy hormone. It has potent calming effects on the central nervous system through its conversion to allopregnanolone, a neurosteroid that modulates GABA receptors. This may be one reason progesterone can influence sleep and anxiety. It also has anti-inflammatory properties.

Testosterone in women is thought to contribute to energy, motivation, muscle maintenance, bone density, and libido. Women produce testosterone throughout their lives (primarily from the ovaries and adrenal glands), and it declines gradually from the late twenties onwards. By the time menopause arrives, levels may be a fraction of what they were at peak.

The symptoms of declining oestrogen are well known: hot flushes, night sweats, vaginal dryness, and irregular periods. But the less visible effects are often more damaging in the long run.

Low Oestradiol accelerates bone loss, increasing fracture risk. Cardiovascular risk rises after menopause, partly as the protective effects on blood vessels and lipids diminish. Cognitive symptoms including brain fog, difficulty concentrating, and memory lapses are commonly reported and increasingly linked to oestrogen withdrawal in the brain. Joint pain, dry skin, recurrent urinary tract infections, and low mood can all be linked to oestrogen deficiency, and are sometimes dismissed or misdiagnosed.

Low Progesterone may contribute to anxiety, insomnia, irritability, and a sense of inner restlessness that many women describe as feeling "wired but tired". During perimenopause, progesterone often drops before oestrogen does, which may help explain why sleep disturbance and anxiety can be among the earliest symptoms, sometimes years before periods stop.

Low Testosterone may contribute to persistent fatigue, loss of motivation, reduced muscle mass, and a decline in libido, although the evidence is strongest for libido. These symptoms are routinely attributed to "just getting older" or stress, but they can have hormonal or other treatable causes, so they are worth discussing with your GP.

The longer-term risks are not trivial. After menopause, the risk of osteoporosis and cardiovascular disease rises.

The British Menopause Society (BMS) and NICE advise that, for otherwise healthy women over 45, perimenopause and menopause are usually diagnosed from symptoms, without blood tests.

The rationale for not testing is that hormone levels fluctuate during perimenopause, making single readings potentially misleading. A blood test for FSH may still be considered in specific situations, such as women aged 40 to 45 with symptoms including a change in their periods, or women under 40 in whom menopause is suspected.

Measuring Oestradiol, FSH, LH, Progesterone, and Testosterone shows your hormone levels at a single point in time. That can add useful context, but it cannot confirm or rule out perimenopause on its own, so results are best interpreted alongside your symptoms by a GP or menopause specialist.

For women on HRT, guidance is that treatment is reviewed on symptom relief and side effects, and routine oestradiol blood tests are not recommended. Your prescriber may check levels in specific situations, such as symptoms that persist despite treatment. Testosterone supplementation is different: guidance recommends blood tests before and during treatment to keep levels within the normal female range.

Testing can also provide a baseline for future comparison, although because levels vary through the cycle and during perimenopause, a single result is a snapshot rather than a fixed benchmark.

One of the most common mistakes in menopause management is assuming that every symptom is hormonal. Many are, but not all, and missing a non-hormonal cause can delay treatment and cause unnecessary suffering.

Thyroid Function is the key alternative to check. Hypothyroidism causes fatigue, weight gain, brain fog, depression, dry skin, hair thinning, and menstrual irregularity. Every one of these overlaps with perimenopause. Thyroid dysfunction is significantly more common in women, and its prevalence increases with age. Testing TSH, Free T4, and Free T3 can help rule this out, and is worth discussing with your GP if you have these symptoms.

Ferritin and Full Blood Count check for iron deficiency anaemia, another common cause of fatigue, breathlessness and poor concentration in women. Heavy or prolonged periods during perimenopause can deplete iron stores rapidly, and the resulting anaemia is often attributed to hormonal changes when it is actually a separate, treatable condition.

Vitamin D deficiency can contribute to fatigue, muscle pain, joint stiffness, and low mood. It is widespread in the UK population and worsens bone health at a time when oestrogen decline is already accelerating bone loss.

HbA1c and Insulin assess metabolic health. Insulin resistance becomes more common as oestrogen declines, and catching it early allows dietary and lifestyle intervention before it progresses to type 2 diabetes.

Vitamin B12 deficiency causes neurological symptoms (tingling, numbness, balance issues) and cognitive impairment that can mimic or compound menopausal brain fog.

A comprehensive blood panel does not replace a clinical assessment with your GP. It can complement it, helping to ensure that treatable conditions are not hidden behind a blanket menopause diagnosis.

Menopause is not a disease. It is a natural transition. But the hormonal changes it brings carry genuine health risks, particularly for bone and heart health.

Bone density declines by up to 20% in the first five to seven years after menopause. By the time osteoporosis is diagnosed on a DEXA scan, significant bone loss has already occurred. Cardiovascular disease risk also rises after menopause. The "protection gap" that opens when oestrogen declines is thought to be one reason women's heart disease risk moves closer to men's in the post-menopausal years.

The psychological toll can be just as significant. Low mood, anxiety, loss of identity, relationship strain, and reduced quality of life are commonly reported by women going through menopause. These are not inevitable consequences of ageing. Many are linked to the hormonal changes of menopause, and help is available.

Knowledge is the starting point. Understanding what is happening in your body can help you have a more informed conversation with your GP or prescriber about HRT, lifestyle changes, or other options. Blood testing can add useful information, such as checking for other causes of your symptoms, but for most women over 45 it is not needed to diagnose menopause. Symptoms are not something you simply have to endure.