The Norwood Scale Explained: What Stage Is Your Hair Loss? (And What to Do at Each Stage)
Androgenetic alopecia, more commonly known as male pattern hair loss, doesn't happen all at once, it follows a fairly predictable pattern of progression. Doctors and hair transplant surgeons use a standard classification tool called the Norwood scale to describe exactly where a patient sits in that process. It will tell you how advanced your hair loss is, which is one of the most useful things to know before deciding on a treatment.
What Is the Norwood Scale?
The Norwood scale, also called the Norwood-Hamilton scale, was first developed by Dr. James Hamilton in the 1950s, based on his observations of balding patterns in a large cohort of men. It was revised and expanded by Dr. O'Tar Norwood in 1975, whose paper in the Southern Medical Journal remains the most cited reference in hair restoration medicine. It's the standard used worldwide, by dermatologists, GPs and transplant surgeons alike, to describe the pattern and severity of male pattern hair loss.
The scale is based on two features: how far the hairline has receded at the temples, and how much thinning has developed at the crown (vertex). There are seven main stages, along with several "A" variants, covered below, for men whose hairline recedes differently. Together, these classifications cover the large majority of cases doctors see.
The 7 Stages of the Norwood Scale
Stage 1
No significant hairline recession. A normal, youthful hairline. This is the baseline against which all other stages are measured.
Stage 2
Mild, symmetrical recession at the temples, sometimes referred to as a "mature hairline." This is extremely common and, on its own, is not necessarily a sign that progressive hair loss will follow; a large proportion of men remain at this stage indefinitely.
Stage 3
The first stage clinically classified as balding. Temple recession becomes deep and well-defined, forming a distinct M, U or V shape at the hairline.
Stage 3 Vertex
Similar hairline recession to Stage 3, with the addition of visible thinning at the crown. This is often the stage where hair loss becomes noticeable to other people before the patient has consciously registered it themselves, since the crown is difficult to see without a mirror or photo.
Stage 4
Hairline recession and crown thinning are both well established, separated by a band of hair across the top of the head connecting to the sides.
Stage 5
The band of hair separating the front and crown areas narrows further, though it remains intact. The contrast between balding and hair-bearing areas becomes more pronounced.
Stage 6
The hairline and crown balding areas merge, removing the connecting band entirely. What remains is a horseshoe-shaped band of hair around the sides and back.
Stage 7
The most advanced stage, with only a thin band of hair remaining around the sides and back, and no hair on top. This is the least common stage at initial presentation.
The "A" Variants
Roughly a third of men with male pattern hair loss follow a different pattern captured by the "A" variants (2A, 3A, 4A and 5A). In a standard Stage 2 to 5 progression, the hairline recedes at the temples while a central "island" of hair at the front is retained, independent of what's happening at the crown. In the A variants, the entire hairline moves backward as one uniform front, with no retained central point, and the crown tends to become involved later and less severely. Doctors distinguish between these patterns because they can affect what a realistic treatment outcome looks like, and because A-variant patterns are sometimes mistaken for less advanced hair loss than they actually represent.
Norwood-Hamilton scale, reproduced from Yip L, Sinclair RD. Antiandrogen therapy for androgenetic alopecia. Expert Review of Dermatology. 2006;1(2):261–269.
| Stage | Hairline | Crown | Typical treatment approach |
|---|---|---|---|
| 1–2 | None to mild recession | Unaffected | Preventative treatment, particularly with family history |
| 3–4 | Established recession | Thinning to established | Medical treatment, typically the best response |
| 5 | Advanced recession | Narrowing bridge | Still worth treating, slower results |
| 6–7 | Severe | Merged with hairline loss | Medication alone often insufficient; transplant more realistic |
How Doctors Diagnose Your Stage
Clinically, staging isn't just a visual guess. Doctors typically use a combination of methods: a visual and photographic assessment from multiple angles in consistent lighting, a family history review (male pattern hair loss is strongly heritable), and often trichoscopy, a form of dermoscopy that examines the scalp and hair shafts under magnification to assess follicle miniaturisation and hair shaft diameter variability, both hallmark signs of androgenetic alopecia. A gentle hair pull test can also help assess how much active shedding is occurring at the time of assessment. In atypical presentations, for example rapid diffuse thinning without a typical pattern, further investigation may be needed to rule out other causes such as telogen effluvium, thyroid dysfunction, iron deficiency or scalp conditions, since these don't respond to the standard treatments used for androgenetic alopecia.
Why the Stage Matters
Androgenetic alopecia is driven by dihydrotestosterone (DHT), a byproduct of testosterone created by the enzyme 5-alpha-reductase. In genetically susceptible follicles, DHT binds to androgen receptors and progressively shortens the anagen (growth) phase of the hair cycle, from a normal duration of several years down to just weeks or months. This produces a cycle of miniaturisation: each regrowth cycle produces a finer, shorter, less pigmented hair than the one before, until the follicle eventually stops producing a visible hair at all.
While a follicle is miniaturising but still alive, it can generally be returned to producing healthy hair with appropriate treatment. Once a follicle has died, no treatment, topical, oral or otherwise, can revive it. This is why earlier-stage classification generally corresponds with a better response to medical treatment: there are simply more living, salvageable follicles to work with, and less time for irreversible loss to have occurred.
Treatment Considerations By Stage
At Stages 1 and 2, treatment is largely preventative. Where there's a family history of balding, starting early is the most effective way to slow or stop progression before it becomes visually significant, since there's essentially a full population of healthy follicles to protect.
Stages 3 and 4 generally show the strongest response to medical treatment. Topical and oral minoxidil work as vasodilators and potassium-channel openers, increasing blood flow to the follicle and prolonging the anagen phase; it's effective in around 70% of users. Finasteride and dutasteride are 5-alpha-reductase inhibitors that block the conversion of testosterone to DHT, addressing the root hormonal driver of miniaturisation directly. Both of these used in combination is typically where the most dramatic regrowth is seen, given the higher number of living follicles still available to respond.
Stage 5 can be worth treating, although results tend to develop more slowly and be less pronounced, since a larger proportion of follicles have already progressed further along the miniaturisation process.
By Stages 6 and 7, a significant proportion of follicles in the affected area have typically died rather than simply miniaturised, meaning medication alone is often not enough to restore meaningful density. Hair transplant surgery, relocating healthy follicles from the permanent donor zone at the back and sides to the balding areas, becomes the more realistic option at this stage, sometimes combined with ongoing medication to protect the remaining native hair and support the transplanted grafts.
How Reliable Is Self-Assessment?
Self-assessment can be reliable, although it's common for people to either underestimate or overestimate their own stage. Clinically, staging is usually assessed from photos taken from multiple angles in consistent lighting, alongside the diagnostic methods described above.
Our 2-minute hair loss assessment is built around this: patients upload a few photos, and one of our AHPRA-registered doctors reviews them and confirms the stage and realistic treatment expectations, free of charge.
Frequently Asked Questions
Can hair loss progress from Stage 2 to Stage 6 quickly?
Progression is usually gradual, occurring over years rather than months, though the rate varies significantly between individuals. Some men remain at an early stage for decades, while others progress more quickly.
Does everyone progress through the stages in the same way?
No. Most men follow a broadly similar pattern of temple recession and crown thinning, but the balance between the two, the rate of progression, and whether the A-variant pattern applies is largely determined by genetics.
Can hair loss stop progressing without treatment?
Although rare, progression can plateau naturally in some cases, but there is no reliable way to predict if or when this will occur for a given individual.
Is the Norwood scale used to assess hair loss in women?
No. Female pattern hair loss follows a different, more diffuse pattern and is assessed using a separate classification called the Ludwig scale.
What if I'm not sure which stage applies to me?
This is common, and exactly what a doctor assessment is for. Between the A-variants, the vertex-only presentations, and the natural difficulty of assessing your own scalp, it can be hard to self-classify accurately, which is why we offer a free doctor review as part of the assessment process rather than asking patients to self-diagnose.
Summary
The Norwood scale gives you a standardised language for how far hair loss has progressed, and that has a direct bearing on what treatment can realistically achieve. Earlier stages mean more living follicles and a stronger response to treatment; later stages shift the conversation toward transplant surgery. If you're unsure where you sit, that's a question worth getting an accurate answer to, rather than guessing in the mirror.
Articles
Original classification paper:
Norwood OT. Male pattern baldness: classification and incidence. South Med J. 1975;68(11):1359-65.
Overview of causes and treatment:
Antiandrogen therapy for androgenetic alopecia:
If you'd like a doctor to confirm your stage and talk through what's realistic for your situation, book a free online consultation with one of our team. If our treatments aren't the right fit for you, we'll give you honest, free advice on your best next steps rather than upselling you.