Menopause: Hormones & Symptoms

Menopause is a natural stage of life when menstrual periods stop permanently as the ovaries wind down their production of reproductive hormones. The years of changing hormones around it can bring a wide range of symptoms. For most people menopause is recognised from the pattern of symptoms and periods rather than from a blood test.

What menopause is

Menopause is defined as having gone twelve consecutive months without a menstrual period, with no other obvious cause, marking the natural end of the reproductive years. It is a single point in time, identified in retrospect once that twelve-month interval has passed. The broader experience people describe as "going through menopause" actually spans several years, because the hormonal changes build up gradually before the final period and continue to settle afterward.

The central change is in the ovaries, which gradually produce less oestrogen and progesterone. As ovarian output falls, the brain's pituitary gland releases more follicle-stimulating hormone (FSH) in an attempt to stimulate the ovaries, so FSH tends to rise. These shifting hormone levels drive most of the symptoms people notice. Menopause typically occurs in midlife. It can also follow surgery to remove both ovaries, in which case the change is abrupt rather than gradual, or it can result from certain cancer treatments, such as some chemotherapy and pelvic radiotherapy.

The stages: perimenopause, menopause, and postmenopause

Clinicians usually describe the transition in three broad stages. The boundaries between them are not sharp, and the experience differs greatly from one person to another.

Perimenopause

Perimenopause is the transition leading up to the final period. Hormone levels begin to fluctuate, often unpredictably, and cycles become irregular — periods may come closer together, further apart, or vary in flow. This is frequently when symptoms such as hot flushes and disturbed sleep first appear. Because hormones swing rather than simply decline, a person can still ovulate and become pregnant during perimenopause, and a single hormone test taken in this phase can be difficult to interpret.

Menopause

Menopause itself is the milestone reached after twelve consecutive months without a period. It is a marker rather than a phase, identified looking back rather than in the moment.

Postmenopause

Postmenopause refers to all the years after that milestone. Oestrogen and progesterone settle at low levels, and FSH stays elevated. Some symptoms, such as hot flushes, often ease over time, while others related to low oestrogen — such as vaginal dryness and changes in bone strength — may persist or develop later. Long-term health considerations, discussed below, become more relevant in this stage.

This table is illustrative and qualitative. Patterns vary widely by individual; it does not give numeric ranges, which differ by laboratory, age, and method.

Common signs and symptoms

Symptoms vary widely; some people have few, others have many, and the same person may notice symptoms come and go. Common experiences include:

• Irregular periods leading up to the final period
• Hot flushes and night sweats (together often called vasomotor symptoms)
• Disturbed sleep, sometimes independent of night sweats
• Mood changes, irritability, low mood, or anxiety
• Vaginal dryness, discomfort, or urinary symptoms (sometimes grouped as genitourinary changes)
• Changes in sex drive
• Difficulty with memory or concentration, sometimes described as brain fog
• Joint aches and changes in skin or hair
• Over the longer term, changes in bone strength and shifts in body composition

The hormone changes behind it

The decline in oestrogen is responsible for many menopausal symptoms, including hot flushes and changes to vaginal tissue. Oestrogen also influences bone, blood vessels, and how the body handles cholesterol, which is why several aspects of health can change after menopause. Progesterone, which works alongside oestrogen during the menstrual cycle, also falls. As these ovarian hormones decrease, FSH and luteinising hormone rise because the pituitary is no longer being held in check by the usual feedback from the ovaries. You can read more about these hormones in our hormones section, including the page on estradiol.

How it is recognised and diagnosed

For most people in the typical age range, menopause is diagnosed from the pattern of symptoms and the change in periods, and blood tests are not usually required. The history — irregular then absent periods alongside characteristic symptoms — is generally enough. Testing can be more useful when symptoms occur at an unusually young age, when periods have stopped for another reason (for example after certain procedures), or when the picture is unclear. When tests are used, they may include:

• FSH — which tends to rise as ovarian function declines, though levels can fluctuate during perimenopause and a single value can mislead.
• Oestradiol — a measure of oestrogen, which tends to fall.
• Thyroid tests (TSH) — to rule out a thyroid cause for overlapping symptoms.

Because hormone levels swing during perimenopause, a single result can be hard to interpret, which is one reason clinicians rely heavily on symptoms rather than on a one-off blood test. Where periods are absent before the expected age, additional evaluation may be undertaken to look for other explanations. For background on the markers, see our blood tests section, and for related life-stage context see life stages.

Long-term health considerations

Because oestrogen influences several body systems, the postmenopausal years bring some longer-term considerations that clinicians monitor over time.

• Bone health: Lower oestrogen can reduce bone density over time, which is relevant to the risk of fractures. Bone health is a common topic in postmenopausal care.
• Heart and blood vessels: Changes in cholesterol handling and blood vessel function may occur, so general cardiovascular health remains important.
• Genitourinary changes: Vaginal and urinary tissue can become thinner and drier, sometimes causing ongoing discomfort that may benefit from specific approaches.
• Metabolic shifts: Some people notice changes in weight distribution and how the body handles blood sugar.

These are general patterns, not certainties; whether and how they affect any individual varies. Routine screening and a personalised discussion with a clinician are the usual way these are addressed.

Early menopause and surgical menopause

Most people reach menopause in midlife, but it can happen earlier. When the ovaries stop working before the usual age range, this is sometimes described as early menopause or, when it occurs notably young, premature ovarian insufficiency. Menopause can also be brought on suddenly by removing both ovaries during surgery, or by certain cancer treatments. When menopause occurs early or abruptly, the considerations differ from typical midlife menopause — symptoms may be more pronounced because the change is sudden, and the longer span of low oestrogen makes long-term health a more prominent part of the discussion. Anyone whose periods stop unexpectedly before the usual age should be evaluated by a clinician.

How symptoms are generally managed

Many people manage menopause with lifestyle measures and reassurance, while others seek help for bothersome symptoms. General approaches, decided with a clinician, can include hormone-based options that may help symptoms such as hot flushes — described in our overview of menopausal hormone therapy — as well as non-hormonal options, and treatments aimed at specific concerns such as vaginal dryness or bone health. The right approach is individual and depends on symptoms, health history, and personal preference. General treatment principles are described in our treatments section, and you can browse related symptoms in the symptoms index. This page is educational and does not recommend any specific treatment.