Perimenopause is the transitional phase leading up to menopause during which oestrogen and progesterone levels fluctuate and gradually decline. It typically begins in the mid-to-late 40s and lasts 4–10 years, though it can begin earlier (even in the late 30s).
Menopause is a single point in time: 12 consecutive months without a menstrual period. Perimenopause is the period before this — often characterised by irregular periods and fluctuating hormones. Paradoxically, symptoms are often most intense during perimenopause (when hormone levels fluctuate widely) rather than post-menopause (when levels are consistently low).
Track symptoms with our free perimenopause tracker before GP appointments.