Hair thinning in midlife hits hard, partly because it's so visible and so little discussed. Here's what's usually going on, and why guessing is the wrong approach.
It is also worth saying at the top: this is one of the few menopausal symptoms that carries shame, and shame is why women arrive years late. There is nothing frivolous about minding your hair. It is the thing you see every morning.
Almost every mistake in this area comes from confusing these, because they need opposite responses.
Shedding. Your hair comes out in handfuls, in the shower, on the pillow, in the brush. It is frightening and it is usually temporary. This is telogen effluvium: a stress, an illness, a crash diet, a birth or an operation pushed a batch of hairs into the resting phase at once, and they let go together a few months later. The trigger was three months ago, not today.
Thinning. Nothing dramatic happens in the shower, but the parting is wider than it was and your ponytail is thinner. Individual hairs are becoming finer and shorter over years. This is female pattern hair loss, and it is the one that needs treating rather than waiting out.
Many women in perimenopause have both, which is exactly why the picture is confusing and why the internet's advice contradicts itself.
Oestrogen helps keep hair in its growing phase. As it declines in perimenopause and menopause, and the relative influence of androgens (like testosterone) rises, some women develop thinning in a female pattern, most noticeable at the crown and along the parting, while the hairline usually stays put.
The mechanism is worth one more sentence, because it explains the timeline. Your androgens have not necessarily risen. Oestrogen fell, so androgens are simply less opposed than they were, and in follicles that are genetically sensitive to them, each growth cycle produces a slightly finer hair than the last. That is why this is gradual, why it is not reversible by a shampoo, and why the earlier it is treated the better it goes. See the first signs of perimenopause.
Hair is a sensitive barometer of overall health, and several common, fixable issues cause shedding:
Because these overlap, a GP visit and simple blood tests (thyroid, iron, sometimes others) are the smartest first step. See should you test your hormones.
Minoxidil takes time, and it gets worse first. Expect a shed in the early weeks as follicles reset, and expect to wait three to six months for a verdict. Almost everyone quits in month two, during the part that means it is working. It also only works while you use it: stop, and the ground you gained goes back.
Hair supplements are the most oversold category in the shop. If you are deficient in something, correcting it helps. If you are not, taking more of it does nothing, and biotin in particular is worth naming twice: it does not help hair in people who are not deficient, and it interferes with several blood tests, including thyroid and some heart tests, which is a genuinely bad trade. Tell whoever takes your blood if you take it. See supplements: what the evidence says and what collagen actually does.
Honestly: sometimes, and it is not a hair treatment.
Restoring oestrogen can slow hormonal thinning, and plenty of women notice their hair settles alongside everything else. But HRT is not prescribed for hair, the evidence for that specific outcome is thin, and expecting your hair back is setting yourself up for disappointment with a treatment that may be doing you a great deal of good elsewhere. See the truth about HRT.
A lot of midlife hair thinning is driven by treatable factors, and even hormonal thinning can often be slowed and supported. Don't suffer in silence; get the simple checks done.
And keep the timeline in mind, because it is the thing that makes people give up. Hair grows about a centimetre a month, so whatever you start today, you are photographing the result at Christmas. The women who get results are not the ones who found the right product. They are the ones who found the right cause and then waited.
Can menopause cause hair loss?
Yes. Falling oestrogen and a shift in the androgen balance can thin hair, typically at the crown and parting, while the hairline stays put.
What should I get checked for hair thinning?
Ask your doctor about thyroid function and ferritin first. Both are common, treatable causes, and ferritin can be low while your full blood count looks fine.
Is it shedding or thinning?
Handfuls coming out suggests shedding, which usually follows a trigger three months earlier and settles. A widening parting with nothing dramatic in the shower suggests pattern thinning, which needs treating rather than waiting out.
Does minoxidil work for women?
It is the best-evidenced treatment for female pattern hair loss. It takes three to six months, often causes a shed at the start, and only works while you keep using it.
Do hair supplements work?
Only if you are deficient in what they contain. Biotin does not help hair in people who are not deficient, and it interferes with several blood tests, including thyroid.
Will my hair grow back?
If the cause was iron, thyroid, stress or a shed after a birth, usually yes. Pattern thinning can be slowed and improved rather than reversed, which is why starting earlier matters.
Sources: NICE Clinical Knowledge Summaries, hair loss in women · NICE NG23, Menopause: identification and management · Teede HJ et al., 2023 International Evidence-based Guideline for PCOS, Hum Reprod 2023 · Educational only, not medical advice.
Keep reading: Thyroid or hormones? · Iron, fatigue and heavy periods · Why your skin changes at menopause · Adult hormonal acne · Take the free Hormone Quiz