Perimenopause Stage Checker
Identify which stage of the perimenopause transition you're in based on your age, menstrual cycle changes, and symptoms — and learn what to expect next.
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Perimenopause — the hormonal transition before menopause — can last 4–10 years and begins, on average, in the mid-40s. It is not a single event but a gradual shift through distinct phases, each with a different hormonal signature and symptom pattern. Many women are surprised by symptoms that start years before their last period. This checker identifies which phase you're likely in based on age, cycle changes, and symptoms.
Example
Cycles: irregular (varies 7+ days)
Stage Indicators
Early: cycles ≤ 7 days different from normal, FSH starting to rise Late: cycles > 7 days apart or skipped, FSH elevated, estrogen dropping Menopause: 12+ months amenorrhea, FSH > 40 IU/L Postmenopause: > 12 months post-menopause
The Four Stages of the Transition
Early perimenopause: cycles still regular or slightly shorter; first symptoms may appear (breast tenderness, mood changes). Late perimenopause: cycles become irregular; hot flashes, sleep disruption, and vaginal changes more pronounced. Menopause: 12 months without a period (average age 51). Postmenopause: hormones have stabilised at lower levels; focus shifts to bone health, cardiovascular risk, and cognitive maintenance.
Frequently Asked Questions
Can perimenopause start in the late 30s?
Yes — early perimenopause before 45 is called early menopause. Before 40 is premature ovarian insufficiency (POI), which warrants medical evaluation.
Is HRT safe?
For most women under 60 without contraindications, the benefits of HRT (symptom relief, bone protection, cardiovascular benefit) outweigh risks. Discuss with a menopause-specialist clinician.
Why do hot flashes happen at night?
Declining estrogen affects the hypothalamus's thermostat function, triggering vasodilation and sweating. Night-time symptoms correlate with estrogen's overnight drop.
Can I still get pregnant in perimenopause?
Yes — until 12 months after your last period, pregnancy is still possible. Contraception is recommended if you wish to avoid pregnancy.