Early menopause: what it is, why it matters and how it is treated
Early menopause and premature ovarian insufficiency: at what age they are diagnosed, the long-term effects on bone, heart and brain, and why treatment differs from menopause at the usual age.
The menopause is a natural stage in every woman's life and usually happens between the ages of 45 and 55. In some women, however, the ovaries slow down or stop working far earlier than expected. Early menopause is not simply the end of periods — it is a process with long-term consequences for a woman's health.
What counts as early menopause
The menopause is diagnosed once at least one year has passed since the last period. The average age is 51. When ovarian function stops between the ages of 40 and 45, this is called early menopause.
If it happens before the age of 40 — in the twenties or thirties — it is called premature ovarian insufficiency (POI). Whether below 40 or between 40 and 45, women in this situation often experience the signs of oestrogen deficiency intensely: irregular periods, severe hot flushes, night sweats, disturbed sleep, vaginal dryness and difficulty concentrating.
Why it matters so much
The significance of early menopause is not limited to the early loss of fertility or to hot flushes that reduce quality of life. Oestrogen acts as a powerful shield for the heart, the blood vessels, the bones and the brain.
Losing that shield at a young age carries serious long-term risks. The evidence shows that untreated early menopause can lead to:
- Bone loss (osteoporosis): oestrogen deficiency accelerates bone loss and substantially raises the risk of fracture in later years.
- Heart and vascular disease: the risk of heart failure, heart attack and stroke is markedly higher than in women who reach the menopause at the usual age.
- Brain health: loss of oestrogen before 45 can increase the later risk of cognitive decline, memory problems, dementia and parkinsonism.
For these reasons, specialists warn that untreated early menopause can shorten life expectancy.
Is the treatment different from menopause at the usual age?
Yes — definitively. In a woman reaching the menopause at, say, 52, hormone therapy is generally used to relieve hot flushes that are affecting her quality of life. In early menopause, and in POI, hormone therapy is not a matter of preference: it is a medical necessity for protecting long-term health.
The main differences are:
- A higher dose is needed. A younger body is physiologically accustomed to higher oestrogen levels. Women with early menopause therefore usually need higher doses than the standard given to women over 50, both to protect bone and heart health and to relieve symptoms.
- A longer course. Where hormone therapy after a menopause at the usual age is generally planned as short-term, women diagnosed with early menopause are strongly advised to continue at least until the usual age of the menopause — around 51 — without interruption, to protect heart and bone health.
- The risks are different. There is a widespread fear that hormone therapy causes cancer. That fear comes from studies carried out in older women, over 60. Guidelines state clearly that hormone therapy in women with early menopause does not increase breast cancer risk compared with their own peers — that is, women whose ovaries are still working normally. The risks of bone loss and heart attack that come from not treating early menopause are considerably more dangerous than the possible side effects of treatment.
If you are under 45 and have irregular periods, hot flushes or a long absence of periods, it is worth having this assessed properly rather than putting it down to stress. See also the long-term risks of the menopause and menopause treatment.