The Ludwig Scale for Female Pattern Hair Loss
Last reviewed on 3 August 2026. We review our treatment guides every six months to keep them accurate.
The Ludwig scale is the classification doctors most often use to grade female pattern hair loss (female androgenetic alopecia) by how far it has progressed. It sorts the thinning into three broad grades, from early, barely noticeable loss to extensive thinning across the top of the scalp. This guide explains what the scale is, walks through each grade, sets out how female pattern loss differs from the male pattern, and looks at how a doctor assesses and monitors it.
For a reliable general overview to read alongside this guide, the NHS hair loss page and the British Association of Dermatologists leaflet on female pattern hair loss are both trustworthy, regularly updated sources. Whatever you read online, it is worth speaking to a GP or a dermatologist before deciding on treatment, so that other causes of hair loss can be ruled out first.
What is the Ludwig scale?
The Ludwig scale, sometimes called the Ludwig classification, was introduced by the dermatologist Erich Ludwig in 1977 to describe the stages of female pattern hair loss. It grades the condition into three levels of severity based on how much hair has thinned over the crown and the top of the scalp. It gives dermatologists and trichologists a shared, plain way to record where someone is, to judge whether the loss is getting worse over time, and to help guide a conversation about treatment.
It is worth being clear about what the scale is and is not. It is a descriptive and monitoring tool, not a diagnosis in its own right. Grading tells you how far the loss has gone, but a proper assessment still has to work out the cause, because several conditions can thin the hair. The scale is best treated as a shared reference point rather than an exact measurement.
How female pattern hair loss differs from the male pattern
The defining feature of female pattern hair loss, and the reason it needs its own scale, is where the thinning happens. In women the loss is typically diffuse across the crown and the top of the scalp, so the centre parting gradually widens, while the frontal hairline is usually preserved. This is quite different from the more familiar male pattern, which usually starts with a receding hairline at the temples and a bald patch at the crown. Men are graded on the Norwood scale, the male counterpart to the Ludwig scale. If you are unsure whether a change at the front is normal, our guide to a mature versus receding hairline may help.
It is uncommon for women to lose hair in the male pattern unless the body is producing an excess of androgens, which is why a doctor may ask about other symptoms such as irregular periods, acne or unwanted facial and body hair.
The three grades of the Ludwig scale
Ludwig described three grades, each covering the same area on the top of the scalp but with progressively more hair lost within it. Throughout, a band of hair is kept at the very front of the scalp.
Ludwig I (mild)
Early, perceptible thinning over the crown, with a band of hair roughly one to three centimetres wide kept in front of it at the hairline. The main sign is that the centre parting starts to look a little wider, though the change can be subtle and easy to miss at first.
Ludwig II (moderate)
More pronounced thinning within that same area on the top of the scalp. Hair density is clearly reduced, the parting is noticeably wider and more of the scalp shows through, but the frontal hairline is still there.
Ludwig III (severe)
Extensive, near-complete loss of hair across the top of the scalp within that same region. Even at this stage the frontal fringe and the hair at the sides and back of the head are characteristically retained, which is one of the features that distinguishes female pattern loss from advanced male balding.
Related ways of grading female pattern hair loss
The Ludwig scale is the best known, but a couple of other classifications are used, sometimes alongside it. The Sinclair scale is a five-point scale that many clinics find useful because its extra steps make it easier to record small changes and to track a response to treatment over time, while still describing the same crown thinning with a preserved frontal hairline.
The Olsen pattern describes a variation where, as well as the diffuse thinning, there is a triangular area of loss that opens out towards the front of the scalp. This is often called the frontal-accentuation or Christmas tree pattern, because of its shape when the hair is parted. These systems all describe the same condition in slightly different ways, so a doctor may use whichever best fits what they see.
How the Ludwig grade is assessed
In practice, the simplest way to judge and follow female pattern hair loss is the parting test: parting the hair down the middle and looking at how wide the parting is and how much scalp shows through, comparing the crown with the denser hair towards the back. A widening part over time is the classic sign, and photographs taken from the same angle at each visit make small changes easier to see.
Grading is only one part of a full assessment. A clinician will also look at the scalp closely, sometimes under magnification, may carry out a gentle pull test to gauge shedding, and will want to rule out other causes such as thyroid problems, iron deficiency, stress-related shedding or a reaction to medication. Blood tests, including thyroid and hormone levels, are sometimes arranged, particularly where there are signs of raised androgens such as in polycystic ovary syndrome. Occasionally a small scalp biopsy is needed to confirm the diagnosis. This is why the sensible first step is to see a GP, who can investigate the cause and refer you to a dermatologist if needed.
What causes female pattern hair loss?
Female pattern hair loss has a strong inherited component, and the tendency can be passed down from either parent. In susceptible follicles the hairs gradually become finer and shorter over successive growth cycles, a process called miniaturisation, until the parting looks thinner. The role of hormones is less clear cut than in men: most women with the condition have normal androgen levels, though it becomes more common after the menopause. Other factors, such as thyroid disorders, low iron, significant stress and some medicines, can add to hair thinning, which is part of why an assessment matters.
What can help
There is no cure, and it is fair to say the realistic aim of treatment is usually to slow or stabilise the loss and, for some women, to recover a little density, rather than to restore the hair fully. Results vary from person to person and cannot be predicted in advance, so it helps to go in with measured expectations. Any treatment generally needs several months of continuous use before its effect can be judged.
Minoxidil is the main evidence-based treatment and the one most often recommended first. It is applied to the scalp and, for some women, slows shedding and encourages modest regrowth, but the benefit only lasts while it is used. Our guide to minoxidil for women goes into how it is used. Anti-androgen medicines, such as spironolactone, are sometimes prescribed under specialist care where hormones are thought to be contributing; you can read more in our guide to DHT blockers for women. These are prescription medicines that are not suitable for everyone, including in pregnancy, so they are a decision to make with a doctor.
Cosmetic options, such as toppers, hair fibres and wigs, can help with the appearance in the meantime. A hair transplant is sometimes an option for women, but not everyone is suitable, and because a transplant does not stop the underlying thinning, medical treatment is usually still advised to protect the hair that remains. Any of these choices is best discussed with a dermatologist who can assess your particular situation.
Frequently asked questions
What is the Ludwig scale and what is it used for?
The Ludwig scale is a three-grade classification of female pattern hair loss, introduced by Erich Ludwig in 1977. Doctors use it to describe how advanced the thinning is over the crown, to monitor whether it is progressing, and to help frame a conversation about treatment. It grades severity rather than making the diagnosis, so it is used alongside a proper assessment of the cause.
How is female pattern hair loss different from male pattern baldness?
In women the thinning is usually diffuse across the crown and top of the scalp, so the centre parting widens while the frontal hairline is generally kept. Male pattern baldness more often starts with a receding hairline at the temples and a bald patch at the crown, which is why men are graded on the separate Norwood scale.
What is the difference between the Ludwig and Sinclair scales?
Both grade the same pattern of crown thinning with a preserved frontal hairline. The Ludwig scale uses three grades, while the Sinclair scale uses five points. The extra steps on the Sinclair scale can make it easier to record smaller changes and to track how someone is responding to treatment.
How is the Ludwig stage worked out at a clinic?
The usual method is the parting test: the hair is parted down the middle and the width of the parting and the amount of visible scalp are compared with the denser hair at the back. A part that widens over time points to progression. A clinician may also examine the scalp under magnification and, where needed, arrange blood tests or a small biopsy to confirm the cause.
Can female pattern hair loss be reversed?
It cannot usually be reversed, but for many women it can be slowed or stabilised, and some regain a little density with treatment. Minoxidil is the main evidence-based option, and any benefit lasts only while treatment continues. Starting sooner tends to give more hair to work with, so it is worth seeking advice early rather than waiting.
Is a hair transplant suitable for women?
Sometimes, but not for everyone. Because female pattern loss is diffuse, the donor hair at the back and sides can also be affected, which means fewer women are good candidates than is the case for men. A transplant also does not halt the underlying thinning, so medical treatment is usually still recommended afterwards. An in-person assessment with a dermatologist or surgeon is the only way to know what suits an individual.
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