Norwood Scale: The 7 Stages of Male Pattern Hair Loss

What is the Hamilton–Norwood scale?

James Hamilton described patterns of hair loss in 1951, and O’Tar Norwood revised the classification in 1975. Norwood’s published study applied the system to 1,000 white adult men, a historical population that should not be treated as representative of every patient (Norwood, 1975; Gupta & Mysore, 2016).

The familiar chart separates patterns of frontal recession and crown thinning. The crown, or vertex, is the upper back part of the scalp. The mid-scalp lies between it and the frontal hairline. These locations matter because two people with similar temple recession may have quite different coverage elsewhere.

The scale is used when assessing androgenetic alopecia, but a matching outline is not enough to establish that diagnosis. A clinician also considers the character of the hair, the condition of the skin and the history of the loss.

Is the Norwood scale used for women?

It was developed for common male patterns. Female pattern hair loss often looks different, with more diffuse thinning over the top of the scalp. Systems such as Ludwig, Sinclair and BASP may be more useful for describing other patterns. Reviews of the classifications explain why no single system captures every presentation (Gupta & Mysore, 2016; Wirya et al., 2017).

Hair texture, colour and shaft thickness also influence how much scalp shows. A similar stage can look different in different people. A diagram should help a consultation, rather than replace examination of the whole scalp.

The seven stages, explained

The descriptions below focus on the main distinctions. Photographs can illustrate appearances, but an individual stage should be assigned from an appropriate assessment rather than one cropped view.

Norwood 1: little or no recession

The frontal hairline shows minimal or no recession. A naturally high hairline is not automatically a sign of active balding. If you have always had the same shape and there is no progressive thinning, the chart alone does not establish a problem needing treatment.

This is a useful baseline for comparison. If you notice new shedding or scalp symptoms despite little visible recession, describe those changes to a clinician: the Norwood number does not capture every type of hair loss.

Norwood 2: mild recession at the temples

Small triangular areas of recession appear at the front corners. This is sometimes described as a mature hairline. The label does not determine whether it will remain stable, and there is no single centimetre measurement that reliably distinguishes normal variation from early progressive loss in everyone.

If the corners are deepening or the hairs behind the edge are becoming finer, consider an assessment. Treatment is based on whether a condition is present and progressing, not on automatically prescribing surgery or dismissing concerns at stage two.

Norwood 3: more pronounced temporal recession

The temples recede more deeply, with bare or sparsely covered areas. In Norwood’s classification, this represents the minimum extent described as baldness. It is a description of appearance, not a threshold at which every person needs an operation (Gupta & Mysore, 2016).

What is Norwood 3 vertex?

In the 3 vertex variant, loss is mainly evident at the crown, while frontal recession does not exceed the degree described in stage three. The vertex and frontal patterns need to be recorded separately. Looking only at the hairline in a mirror can miss a change at the crown.

What does the letter A mean?

The Type A variants describe a hairline that retreats from front to back without the usual separate bald area developing at the crown at the same time. They cover variants of stages two to five. The letter A is not simply an extra step between two adjacent numbers.

For example, a broad retreat of the frontal line may be described differently from deep temple recession around a preserved central forelock. The clinician can explain which pattern fits and why the distinction matters for your treatment plan.

Norwood 4: frontal and crown loss with a separating band

Recession at the front is more extensive, and there is sparse or absent hair at the vertex. A band of hair still separates the two areas and connects with the hair at the sides.

It is important to assess the condition of that band rather than assuming all hair across the top has disappeared. Its density and any ongoing miniaturisation contribute to planning, particularly if surgery is being discussed.

Norwood 5: a narrower, sparser bridge

The areas of loss at the front and crown are larger. They remain separated, but the bridge between them is less substantial than at stage four.

A remaining bridge distinguishes the standard stage five pattern from stage six, where the areas join. The distinction can be difficult to judge when hair is long, wet or styled across the scalp. Consistent photographs and examination are more useful than trying to decide from a single close-up.

Norwood 6: the frontal and crown areas join

The bridge across the top has disappeared or become insufficient to separate the frontal and vertex areas of loss. Hair remains around the sides and back, while coverage across the top is greatly reduced.

This remaining fringe does not automatically provide enough donor grafts for dense coverage everywhere. The surgeon must examine its actual density, hair characteristics and stability before suggesting transplantation.

Norwood 7: extensive loss with a narrow remaining fringe

This is the most advanced main stage. Only a narrow horseshoe-shaped band of hair remains around the sides and back, and it may itself be fine or relatively sparse.

Stage seven is not the same as losing every scalp hair, and it is not automatically the endpoint for everyone with early recession. Nor does the number alone establish whether surgery is possible. Available donor hair and realistic coverage goals become especially important.

How can you estimate your own stage?

Use the chart as a rough description to bring to a consultation. Take photographs from the front, both temples, the top and the crown, using similar lighting and a consistent hairstyle. Ask someone to help with the crown view rather than relying only on a mirror selfie.

Compare the areas of recession, crown loss and the bridge between them. Do not judge solely by how high the forehead looks. Hair fibres, wet styling and differences in camera angle can change apparent coverage without changing the underlying pattern.

If two clinicians give neighbouring scores, ask what they actually observed. A review of male-pattern classifications found trade-offs between detail, practicality and reproducibility, including limitations in agreement with the Norwood system (Wirya et al., 2017). The important question is whether the diagnosis and plan make sense, rather than obtaining one supposedly perfect number.

When a chart is not enough

Sudden shedding, sharply defined patches, pain, redness, scaling or loss of eyebrows can indicate a different problem. Arrange medical advice rather than trying to fit every presentation into the chart. Our guide to a receding hairline discusses the distinction between gradual temple recession and other causes.

Do not wait for a higher stage before seeking help if the change is concerning you. Equally, a low stage does not mean treatment is compulsory. Observation and photographs may be reasonable after assessment.

Does your Norwood stage determine treatment?

No treatment is prescribed by the number alone. The pace of loss, diagnosis, condition of existing follicles and your priorities all matter. A useful consultation distinguishes preserving existing hair, stimulating possible growth and redistributing donor hair surgically.

Medical treatment and monitoring

Medicines such as topical minoxidil and oral finasteride have evidence for treating appropriate cases of male androgenetic alopecia. A network meta-analysis of 23 studies found differences in hair-count outcomes across treatments and follow-up periods. These results help inform treatment choices, although the response varies and a particular improvement on the Norwood scale cannot be guaranteed (Gupta et al., 2022).

A clinician should explain suitability, adverse effects, duration and how progress will be assessed. Benefits may require continuing treatment. Finasteride, in particular, needs discussion of psychiatric and sexual adverse effects under current UK safety advice.

Natural oils and cosmetic shampoos should not be assumed to offer an equivalent effect. If an additional procedure such as PRP or light therapy is proposed, ask what evidence applies to your diagnosis and how its value will be reviewed. A stage label is not evidence that a fixed course will work.

At what stage can a hair transplant be considered?

A hair transplant may be appropriate for selected patients at different stages. The decision depends on an individual assessment, including at early or advanced stages.

The assessment should address stability of hair loss, donor supply and the future design. Young patients with rapid progression may need medical management and reassessment before surgery. In advanced loss, the available grafts may be best concentrated in selected areas rather than spread too thinly across the entire scalp (Goldin et al., 2025).

An FUE procedure harvests grafts individually. The choice of harvesting and placement methods depends on the case and team; it is not dictated by the Norwood score. Good aftercare matters, but it cannot guarantee that every graft survives or that the result meets every expectation.

How many grafts does each stage need?

There is no reliable universal graft count per stage. Two patients with the same classification can have different scalp areas to cover, hair shaft thickness, donor density and desired hairlines. A graft may contain more than one hair, so confirm which unit a quotation uses.

Ask for a plan showing the area to be treated, the estimated graft allocation and the intended density. Discuss the donor area and what would remain for a possible later procedure. The assessment should also explain any limits on full coverage and why a second session might or might not be appropriate.

Before-and-after hair transplant photographs

The photographs below show examples published by Body Expert. Their embedded graft counts and follow-up labels describe the cases as presented; they are not prescriptions for everyone with a similar hair-loss pattern. Photography, hair length and styling also influence the appearance of density.

When discussing examples with a clinician, compare the starting pattern and hair characteristics as well as the outcome. Ask about the donor area, the time elapsed and whether ongoing treatment was used. A photograph can help communicate your goals, while your own assessment establishes what is feasible.

The Norwood scale is most useful as shared language for a clinical conversation. Bring your photographs and questions, then discuss the diagnosis, likely course and options rather than treating the number as a forecast or an instruction to operate.

Sources

Norwood, O. T. (1975). Male pattern baldness: Classification and incidence. Southern Medical Journal, 68(11), 1359–1365. https://doi.org/10.1097/00007611-197511000-00009

Gupta, M., & Mysore, V. (2016). Classifications of patterned hair loss: A review. Journal of Cutaneous and Aesthetic Surgery, 9(1), 3–12. https://doi.org/10.4103/0974-2077.178536

Wirya, C. T., Wu, W., & Wu, K. (2017). Classification of male-pattern hair loss. International Journal of Trichology, 9(3), 95–100. https://doi.org/10.4103/ijt.ijt_46_17

Gupta, A. K., Venkataraman, M., Talukder, M., & Bamimore, M. A. (2022). Relative efficacy of minoxidil and the 5-α reductase inhibitors in androgenetic alopecia treatment of male patients: A network meta-analysis. JAMA Dermatology, 158(3), 266–274. https://doi.org/10.1001/jamadermatol.2021.5743

Goldin, J., Zito, P. M., & Raggio, B. S. (2025, August 2). Hair transplantation. In StatPearls. StatPearls Publishing. NCBI Bookshelf chapter.

Medicines and Healthcare products Regulatory Agency. (2026, May 11). Finasteride and dutasteride – updated safety warnings for psychiatric side effects and sexual dysfunction. Drug Safety Update.