A widening part: early signs of thinning hair in women

Many women first notice thinning hair in the mirror, when the parting looks wider or more scalp shows under bright light. Others notice that their ponytail feels thinner. A widening part is one of the classic early signs of female pattern hair loss (FPHL), but it is not the only possible cause, and it is worth understanding before you decide what to do.

What a widening part usually means

The American Academy of Dermatology describes a widening part and a thinner ponytail as typical signs of FPHL, which is the most common cause of hair loss in women ¹. Unlike men, women with FPHL rarely go bald. Instead, the hair on the top of the head becomes gradually thinner while the hairline at the front usually stays in place. The temples can recede slightly.

In 1977, the dermatologist Erich Ludwig described the female pattern as distinct from common baldness in men, and proposed a staged classification. His paper noted that this type of hair loss in women occurs much more often than generally believed ². Doctors still use the Ludwig scale, and similar scales, to describe how far the thinning has progressed:

• Early stage: the parting is slightly wider and more scalp shows on the top of the head
• Middle stage: thinning is more obvious across the crown and top
• Advanced stage: the top of the head is very thin, though the front hairline often remains

Why it happens

FPHL has a strong genetic component, and the genes can come from either parent ³. Hair follicles on the top of the scalp gradually shrink, a process called miniaturisation. Each follicle produces finer, shorter hairs, and over time some stop producing visible hair. Scalp hairs grow in small groups of three or four, and in pattern hair loss these groups slowly lose hairs, which is why more scalp becomes visible along the parting ³.

The role of hormones is less clear than in men. Most women with FPHL have normal hormone levels in their blood. FPHL is more common after menopause, which suggests that hormonal changes play some role ³. A few women have high androgen levels, often with acne, irregular periods and extra facial or body hair. These are features of polycystic ovary syndrome (PCOS) ³.

FPHL often begins in a woman's 40s, 50s or 60s, but it can start earlier ¹. DermNet notes that it often progresses in bursts, with phases of faster loss lasting three to six months followed by stable periods lasting six to 18 months ³.

Other causes of a wider part

Not every wider parting is pattern hair loss. Other causes include:

• Telogen effluvium: heavy shedding after illness, childbirth, stress or dieting can thin the hair across the whole scalp, including the parting. See sudden hair fall
• Low iron or thyroid problems: these can cause diffuse thinning and are worth checking ⁴
• Traction: always parting in the same place, or wearing tight styles, can put strain on the hair along the part
• Styling and lighting: wet hair, flat hair or a harsh overhead light can make a normal parting look wider

A dermatologist can examine the scalp, often with a magnifying device, and may arrange blood tests to tell these conditions apart. This matters because the treatments are different ¹.

What you can do

Treatment options

There is no cure for FPHL, but treatment can slow it down, and some women notice thicker hair. Results vary from person to person ³.

• Topical minoxidil is the main treatment approved for FPHL. A Cochrane review found it effective, with no clear difference between the 2% and 5% strengths, although the evidence was of moderate to low quality ⁵. Shedding can increase for the first two to eight weeks, it takes six to 12 months to judge results, and you need to keep using it to maintain the effect ¹. Avoid it during pregnancy. See our minoxidil guide
• Prescription anti-androgen tablets, such as spironolactone, are used off-label by some dermatologists, especially when there are signs of excess androgens ¹. They are not suitable during pregnancy
• Treating any deficiency or other cause that is found, such as low iron

For a fuller look at the options, see female pattern hair loss treatment.

Styling tips

• Change where you part your hair from time to time
• Try a slightly off-centre or zigzag parting, which hides the scalp better than a straight line
• Ask for a layered cut that adds volume on top
• Use a gentle shampoo and a light conditioner, and avoid tight ponytails or buns
• Hair fibres or a coloured scalp powder can hide the parting for special occasions

When to see a doctor

See a doctor or dermatologist if:

• Your parting has widened noticeably over a few months
• You also have acne, irregular periods or extra facial hair
• There is heavy shedding, bald patches, redness or itching
• You feel tired, cold or short of breath, which may suggest anaemia or thyroid problems

Treatment works best when it starts early, at the first sign of thinning ¹.

The bottom line

A widening part is often the first sign of female pattern hair loss, a common, inherited condition that tends to progress slowly. Other causes, such as shedding, low iron or thyroid problems, can look similar, so a proper check is worthwhile. Treatments such as topical minoxidil can help slow thinning, and simple styling changes make it less noticeable while you wait for results.

Frequently asked questions

Is a widening part a sign of hair loss?

It is a common early sign of female pattern hair loss, but shedding, low iron and thyroid problems can look similar ^{1 3}.

What is the Ludwig scale?

A classification of the stages of female pattern hair loss, first described in 1977 ².

Can a widening part be treated?

Topical minoxidil can slow thinning and help some women. It takes six to 12 months to judge results ^{5 1}.

Does female pattern hair loss lead to baldness?

Rarely. Women usually get thinner hair on top while the front hairline stays in place ¹.

Educational content. Not medical advice.