Menopause hair · Evidence led

Perimenopause hair thinning: what to notice

Hair can change years before menopause. Here is what that can look like, what to write down and when to ask for help.

Yes, hair can thin or shed during perimenopause, often years before your last period. Falling hormone levels can play a part and so can heavier periods that lower iron, stress, thyroid changes and the same pattern hair loss that becomes more common with age.

In the consultation room I met many women in their early or mid 40s who felt too young for this conversation. They would say, "But I am still having periods." Hair does not wait for a tidy end date. This article explains what to notice, how to tell shedding from thinning and when to book an appointment. It is education, not a diagnosis. For the wider picture, start with our guide to menopause hair loss.

Timing and uncertainty

Perimenopause is the stretch of time when hormone levels begin to shift and periods may become less regular, heavier, lighter or closer together. It can last several years. Menopause itself is dated after 12 months without a period. NICE notes that hormone tests are usually not needed to diagnose menopause in healthy women aged 45 or over. Age and situation change that conversation, especially if you are under 40 or between 40 and 45.^[6]

Hair does not follow the calendar neatly either. Female pattern hair loss is most often noticed in the 40s, 50s or 60s.^[1][2] A UK study found it in 6% of women under 50 and in 38% of women aged 70 and over, so age itself matters as well as menopause.^[7] Around menopause, many women also notice texture changes, with hair feeling drier, coarser or less manageable.^[8] A review of hormonal change in midlife asked whether there is a separate "midlife hair crisis" and pointed to several overlapping causes rather than one simple switch.^[9]

Oestrogen does influence how follicles grow.^[10] That does not mean every change in your 40s is "just hormones". It means hormones are one piece of a picture that also includes genes, iron, thyroid health, styling, medicines and stress.^[11][12]

Perimenopause does not mean pregnancy is impossible. That matters if you are considering any hair treatment later, so mention it to your pharmacist or GP before starting something new.^[13]

Shedding versus thinning

Three patterns can look the same in a hairbrush. Telling them apart changes what you do next. Our article on shedding, thinning or breakage goes into more detail.

Shedding means more full length hairs falling from the root, often with a tiny pale bulb at one end. Losing 50 to 100 hairs a day is typical.^[12][3] A sudden rise to several hundred a day, noticed in the shower or on the pillow, can fit telogen effluvium. Common triggers include high fever, an operation, illness, sudden weight loss, a big change in diet, iron deficiency, thyroid changes, some medicines and severe stress.^[3][4][14] Hormonal change around menopause is also listed among possible triggers.^[14] Most people notice the extra hair two to four months after the trigger, not on the day it happens.^[3] Shedding often eases over 6 to 9 months once the body has reset.^[3][14]

Thinning usually means female pattern hair loss: finer hairs and a slowly wider centre parting, with a front hairline that stays in place.^[1][15][2] The growing phase shortens and follicles produce shorter, finer hairs. Because follicles cycle more quickly, daily shedding can rise even before the parting looks obviously wider.^[2] Genetics play a part and there may be a family link on either side.^[11][1]

Breakage means hairs snapping along their length. You see short pieces with no bulb and often frayed or blunt ends. Years of heat, colour and tension add up and hair often feels more fragile around this time of life.^[11][8]

Two or all three can happen together.^[2] A stressful year on top of slow thinning is very common. So is extra breakage on hair that is already finer.

What to record

You do not need special equipment. A few consistent notes help a hair expert or GP far more than a daily strand count.

Avoid counting every hair every day. It rarely helps and can make worry worse. Light, curl pattern, colour and a fresh parting all change how much scalp shows, so a photo is a clue rather than a diagnosis.^[15][18]

If you want a simple weekly prompt, our free 7 day hair kindness checklist gives one gentle action a day, including a baseline photo and a medicines list.

Other causes that sit beside hormones

Before you put everything down to perimenopause, it is worth thinking about the same list we use later in life. We cover it in more depth in hair thinning after 50: causes worth checking.

Iron is especially relevant here. Ferritin is a measure of the body's iron stores. Lower ferritin has been associated with some types of hair loss in women, though not all studies agree.^[19][20][21] Heavy periods, a low iron diet or problems absorbing iron can all lower it.^[5] If a test shows deficiency, your GP may recommend treatment and look for the cause. Do not guess a high dose yourself.^[20][5] Read more in ferritin and hair loss.

Both an underactive and an overactive thyroid can affect hair. Clues include tiredness, feeling unusually cold or hot, palpitations and weight change. Some of those symptoms overlap with perimenopause, which is one reason a GP may consider a thyroid test.^[11]

Crash dieting and very low protein intake can affect hair growth.^[11] Our guide to nutrition for menopausal hair covers the basics without miracle claims.

Some medicines can cause shedding. Never stop a prescribed medicine yourself. Talk to your GP or pharmacist if your hair changed after starting something new.^[12]

When to book an appointment

A receding hairline or eyebrow loss can be a sign of frontal fibrosing alopecia, which needs prompt medical care.^[18] Breakage at the crown with bumps or tenderness can be an early sign of a scarring condition called CCCA, which is more common in Black women.^[22] Do not wait and hope those patterns settle on their own.

If your hair is affecting your mood or how you move through the day, say so. A BMJ review described anxiety, low mood and difficulties in social and working life among people living with alopecia.^[23] Alopecia UK offers support groups and resources.^[24]

Want a printable plan?

The Menopause Hair Guide includes an observation sheet, a shedding tracker, a monthly photo method and a GP appointment script, alongside a clear overview of what the research shows. It is a calm place to gather what you notice in perimenopause, not a diagnosis.

Keep reading

• Menopause hair loss: a clear starting point
• Shedding, thinning or breakage: what is different?
• Hair thinning after 50: causes worth checking

This article is general education, not medical advice. It cannot diagnose or treat any condition. Speak to a qualified hair expert or your GP about hair changes and seek medical help promptly for the warning signs above.