Stages of Menopause
Stages of Menopause
Menopause is not a single event — it is a transition that unfolds over many years across three distinct stages. Understanding each stage helps women recognise what is happening in their bodies and make informed decisions about their health.
Stage 1: Perimenopause
Perimenopause is the transitional phase leading up to menopause, typically beginning in the mid-40s (though it can start in the late 30s). The ovaries gradually produce less oestrogen and progesterone, causing hormonal fluctuations that produce a wide range of symptoms.
Duration
Typically 4–10 years, ending when a woman has gone 12 consecutive months without a period.
Key hormonal changes
- Oestrogen levels fluctuate widely — sometimes higher than normal, sometimes lower
- Progesterone declines more consistently and earlier than oestrogen
- FSH (follicle-stimulating hormone) rises as the ovaries become less responsive
- AMH (anti-Müllerian hormone) declines as ovarian reserve diminishes
Common symptoms
- Irregular periods (shorter, longer, heavier, or lighter)
- Hot flushes and night sweats
- Sleep disturbances
- Mood changes, irritability, anxiety
- Brain fog
- New or worsening PMS
- Changes in libido
- Breast tenderness
Diagnosis
Primarily clinical (based on symptoms and age). NICE guidelines recommend that women over 45 with typical symptoms do not require blood tests for diagnosis. FSH and oestradiol tests can be helpful but are not always conclusive due to hormonal fluctuation.
Stage 2: Menopause
Menopause is defined as 12 consecutive months without a menstrual period. It is confirmed retrospectively — you only know you have reached menopause once 12 months have passed. The average age in the UK is 51.
Premature and early menopause
- Premature ovarian insufficiency (POI): Menopause before age 40. Affects 1 in 100 women. HRT is strongly recommended until at least age 51.
- Early menopause: Between ages 40–45. Affects approximately 5% of women.
- Surgical menopause: Caused by removal of the ovaries (oophorectomy). Symptoms are often more severe due to the abrupt hormonal drop.
Stage 3: Postmenopause
Postmenopause refers to all years following menopause. Oestrogen levels remain consistently low. While acute symptoms like hot flushes may ease for many women, the long-term health implications of oestrogen deficiency become increasingly important.
Long-term health priorities in postmenopause
- Bone health: Up to 20% of bone density can be lost in the first 5–10 years after menopause. Calcium, vitamin D3+K2, weight-bearing exercise, and HRT are protective.
- Cardiovascular health: Risk of heart disease increases substantially after menopause. Omega-3, Mediterranean diet, exercise, and not smoking are key.
- Cognitive health: Omega-3 DHA, aerobic exercise, and cognitive engagement are protective.
- Genitourinary health: GSM (vaginal dryness, urinary symptoms) often worsens without treatment. Topical oestrogen is safe and highly effective.
Frequently asked questions
How do I know which stage I am in?
If your periods are irregular but have not stopped for 12 months — perimenopause. If it has been exactly 12 months since your last period — you have reached menopause. After that, you are postmenopausal.
Can menopause symptoms return in postmenopause?
Genitourinary symptoms often worsen in postmenopause without treatment. Hot flushes typically ease over time but can persist for many years in some women.