Dr Shashi Prasad GP & Menopause Specialist | Women's Hormonal Health & Functional Medicine in South London

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Published: 02/07/2026
Edited by: Odette Sotillo on 02/07/2026

Menopause is the point when periods have stopped for 12 consecutive months, while perimenopause is the transitional phase leading up to that point. Perimenopause involves fluctuating hormone levels and ongoing, though irregular, menstrual cycles, whereas menopause confirms that ovarian function has significantly declined.

In practical terms, perimenopause is a phase you move through, and menopause is a specific milestone marking the end of natural fertility.

What hormonal changes distinguish perimenopause from menopause?

Perimenopause is characterised by fluctuating and unpredictable levels of oestrogen and progesterone, which can rise and fall unevenly. These hormonal shifts are responsible for many of the variable symptoms experienced during this stage.

Menopause, by contrast, reflects consistently low hormone levels, particularly oestrogen. This hormonal stability at a lower level often means some symptoms settle, although others, such as vaginal dryness, may persist.

How do menstrual patterns differ between the two stages?

Perimenopause typically presents with irregular periods, which may become lighter, heavier, shorter, or more spaced apart. These changes can occur over several years and are often one of the earliest noticeable signs.

Vaginal bleeding is not considered normal during menopause and should be assessed by a healthcare professional.

How do symptoms differ between perimenopause and menopause?

Perimenopause often causes a wider range of fluctuating symptoms due to hormonal instability, whereas menopause symptoms may become more consistent or, in some cases, less intense over time.

Common perimenopause symptoms:

Irregular or unpredictable periods.
Sudden mood swings linked to hormonal fluctuations.
Breast tenderness.
Episodes of heavier or prolonged bleeding.

Common menopause symptoms:

Absence of periods for 12 months.
Persistent vaginal dryness.
Ongoing sleep disturbance.
Reduced bone density over time.

Some symptoms, such as hot flushes and night sweats, can occur in both stages but may vary in frequency and intensity.

How is each stage diagnosed?

Perimenopause is usually identified based on symptoms and changes in menstrual patterns rather than a single test. Because hormone levels fluctuate significantly, blood tests are not always reliable during this phase.

Menopause is diagnosed retrospectively after 12 consecutive months without a period. In most women over 45, no further testing is required unless symptoms are unusual or there are concerns about other conditions.

Do treatment approaches differ between perimenopause and menopause?

Treatment approaches are similar but may be tailored depending on whether symptoms are fluctuating or stable. The aim in both stages is to reduce symptoms and support long-term health.

Options that may be used across both stages include:

Hormone replacement therapy (HRT) to stabilise or replace hormones.
Non-hormonal medications for hot flushes or mood changes.
Vaginal oestrogen for local symptoms such as dryness.
Psychological support, including cognitive behavioural therapy (CBT).

During perimenopause, treatment may focus more on stabilising hormonal fluctuations, while in menopause, the emphasis may shift towards maintaining bone, heart, and urogenital health.

When should you seek medical advice?

Medical advice should be sought if there is uncertainty about whether symptoms relate to perimenopause or menopause, or if symptoms are affecting quality of life. Early guidance is particularly important for women under 45 or if periods stop suddenly.

You should also seek medical review if you experience:

Vaginal bleeding after menopause.
Concerns about treatment options or long-term health.

If you are experiencing symptoms of menopause or perimenopause or have concerns about hormonal changes, visit Dr Shashi Prasad’s Top Doctors profile to arrange an appointment.