Where are you in the menopause transition?

Clinically, menopause refers to a single point in time: the day that marks 12 consecutive months since your last menstrual period. What most people mean is the full transition from perimenopause to stable postmenopause. According to the SWAN study, the median total duration is 7.4 years, but the range spans from under 2 years to more than 14. Vasomotor symptoms (hot flushes and night sweats) last a median of 7.4 years, with 29% of women experiencing them for 10 years or more. Women who develop hot flushes during early perimenopause tend to have a longer total symptom duration than those whose symptoms begin after their final period.

The STRAW+10 system defines five key stages. Early perimenopause (stage -2) begins when cycles start shifting by 7 or more days. Late perimenopause (stage -1) is marked by 60 or more days of amenorrhea. The final menstrual period (stage 0) is confirmed retrospectively after 12 months. Early postmenopause (stage +1) covers roughly the first 6 years post-final-period. Late postmenopause (stage +2) follows and continues for the remainder of life. Each stage has a distinct hormonal profile, typical symptom pattern, and expected duration.

The median age of the final menstrual period is 51 years in the UK (NHS/BMS data) and 51.4 years in the US (SWAN study). The 5th to 95th percentile range spans from 44 to 58 years. Menopause before 40 is classified as premature ovarian insufficiency and affects approximately 1% of women. Menopause between 40 and 45 is considered early menopause, affecting roughly 5%. Smoking is the strongest modifiable factor, advancing menopause by 1 to 2 years on average.

Perimenopause typically lasts 4 to 8 years. Early perimenopause alone can last 2 to 6 years, characterised by subtle cycle changes many women do not initially notice. Late perimenopause, when periods become noticeably irregular and symptoms intensify, usually lasts 1 to 3 years. Women who enter perimenopause earlier (before 45) tend to have a longer total transition, while those who start later often progress more quickly.

Yes. Pregnancy is possible throughout perimenopause until menopause is confirmed (12 consecutive months without a period). Ovulation becomes irregular but does not stop entirely. Natural conception rates in the mid-40s are estimated at under 5% per cycle but are not zero. The Royal College of Obstetricians and Gynaecologists recommends continuing contraception until age 55, or 2 years after the last period if under 50, or 1 year after if over 50. HRT is not a contraceptive and does not prevent pregnancy.

Clinical staging uses the STRAW+10 system, combining menstrual cycle criteria with supportive biomarkers. Regular cycles indicate premenopause; persistent 7-plus-day cycle shifts indicate early perimenopause; skipped periods of 60 or more days indicate late perimenopause. Blood tests support staging but are not definitive in isolation. FSH above 25 IU/L is suggestive of late perimenopause; consistently above 30 to 40 IU/L indicates postmenopause. Most GPs in the UK diagnose menopause based on age and symptoms alone in women over 45, without blood tests.

Yes. The SWAN study found meaningful differences between ethnic groups. Black and African American women reach menopause approximately 1.5 years earlier on average and experience vasomotor symptoms for a median of 10.1 years, the longest of any group studied. Japanese American women reach menopause slightly later (median 52.0 years) and report shorter symptom duration. Chinese American women have a similar menopause age to white women but lower rates of vasomotor symptoms. These differences are not fully explained by socioeconomic factors, BMI, or smoking and appear to have genetic components.

Perimenopause is the transition period leading up to the final menstrual period, characterised by fluctuating hormone levels, changing cycle patterns, and symptoms such as hot flushes, sleep disruption, and mood changes. Menopause, clinically, is a single retrospective milestone: the point at which 12 months have passed since the last period. Everything after that point is postmenopause. When people say "I am going through menopause," they almost always mean perimenopause or early postmenopause. This distinction matters because symptoms, treatment options, and health considerations differ at each stage.