The Perimenopause Timeline Nobody Hands You At 38

The conversation most women expect to have about menopause is one about hot flushes, arriving somewhere around fifty. The conversation many actually end up having starts around thirty-eight, is mostly about sleep and anxiety, and takes an average of several appointments before anyone uses the word perimenopause.

This is the timeline as gynaecologists describe it — and the symptoms that reliably arrive before the ones everybody knows about.

Stage one: the years before anything changes on the calendar

The earliest phase of perimenopause involves ovulation becoming less consistent while cycle length still looks broadly normal. Progesterone tends to fall first, and oestrogen becomes erratic rather than low.

“That erratic pattern is why the early symptoms are so easy to attribute to something else,” says Dr Boateng. “Poor sleep, a shorter fuse, breast tenderness, new anxiety in the second half of the cycle. Most women I see have been told it's stress, and to be fair, stress is also happening.”

Stage two: the cycle starts moving

Cycles shortening by a few days, then lengthening unpredictably, is the conventional clinical marker. Bleeding often becomes heavier before it becomes lighter, which surprises people who expected a gradual fade.

This is also when vasomotor symptoms — flushes, night sweats — typically begin, though a substantial minority never get them at all.

“Most women I see have been told it's stress. To be fair, stress is also happening.”Hannah Boateng, MD, MPH

The symptoms that don't get mentioned

Joint and muscle aching is common and under-discussed. So are dry eyes, changes in body odour, tinnitus, heart palpitations, itchy skin, and a form of word-finding difficulty that women routinely describe as the most frightening symptom of the lot.

“The cognitive symptoms are real, they're mediated by fluctuating oestrogen, and for the overwhelming majority they resolve,” says Dr Ngata. “Saying that out loud in an appointment changes how someone experiences the next two years.”

Why blood tests are of limited use

FSH and oestradiol fluctuate substantially day to day during perimenopause. A normal result on a Tuesday does not exclude anything, and an abnormal one on a Thursday does not confirm much.

Current guidance in most countries is that perimenopause in women over 45 is diagnosed on symptoms and cycle history. Testing is more useful under 40, where premature ovarian insufficiency needs excluding.

What to take into the appointment

Three months of cycle dates, a short list of symptoms ranked by how much they affect your life, and the specific question you want answered. Symptom diaries sound fussy and materially change the quality of a ten-minute consultation.

It is reasonable to ask directly: is this consistent with perimenopause, what are my options including hormonal and non-hormonal, and what would change your mind?