Norwood scale: the stages of male pattern baldness explained
Reviewed by the My London Pharmacy clinical team
·30 October 2026
·7 min read
·Reviews on Trustpilot
Quick answer
The Norwood scale grades male pattern baldness from stage 1 (no visible loss) to stage 7 (extensive loss). It helps describe a hairline's progression, not predict it exactly. Treatment options tend to work best when started at an earlier stage, before the hair follicles involved have been inactive for a long time.
What is the Norwood scale?
The Norwood scale, sometimes called the Hamilton-Norwood scale, is a classification system used to describe the typical pattern of male pattern baldness, medically known as androgenetic alopecia. It was developed to give clinicians and researchers a consistent way to describe how far a receding hairline or thinning crown has progressed, using a series of reference stages rather than vague terms like "a bit thin" or "quite advanced".
It runs from stage 1, where there is no noticeable hair loss, through to stage 7, where the hair that remains is largely confined to a narrow band around the sides and back of the head. Most men who experience hereditary hair loss will recognise their own pattern somewhere on this scale, often starting at the hairline or the crown, or both at once.
The scale is descriptive rather than diagnostic. It is useful for tracking change over time and for discussing treatment options, but it does not tell you why your hair loss is happening or how quickly it will move to the next stage. Some clinics also use a related system, the Norwood-Hamilton Class A variant, which describes a less common pattern where the hairline recedes evenly without the vertex thinning seen in the classic stages. In practice, most men fit reasonably well onto the standard seven-stage scale, and it remains the version most commonly referred to in UK clinical guidance and research literature.
The stages in detail
Stages 1 and 2 cover the earliest, often barely noticeable changes at the temples. Stage 3 is generally considered the first stage where hair loss becomes clinically significant, a point some clinicians use as a reference for when treatment may be worth discussing. A separate variant, "stage 3 vertex", describes thinning that starts at the crown rather than the hairline.
Stages 4 and 5 involve a narrowing band of hair that still separates the receding front from the thinning crown. By stage 6, this band has usually thinned enough that the two areas of loss appear connected. Stage 7, the most advanced stage on the scale, leaves only a horseshoe-shaped band of hair around the sides and back of the head.
How fast does hair loss progress through the stages?
There is no fixed timeline. Male pattern baldness is driven by genetics and by how individual hair follicles respond over time to dihydrotestosterone (DHT), a hormone produced from testosterone. Some men move through several stages within a decade of their first signs of recession; others stay at an early stage, such as stage 2 or 3, for many years, or never progress much further at all.
Age at onset tends to matter. Hair loss that starts in the late teens or early twenties is often (though not always) associated with a faster or more extensive pattern than hair loss that first appears in a man's forties or fifties. Family history is also a reasonably strong guide, though it is not a precise predictor for any one person: having a father or grandfather with advanced hair loss raises the likelihood of a similar pattern, but inheritance involves several genes rather than a single one, which is why brothers in the same family can have noticeably different outcomes.
Hair loss does not usually progress at a steady rate. It is common for men to notice a period of more rapid change followed by months or years where things seem fairly stable, rather than a smooth, predictable slide from one stage to the next.
Which stages respond best to treatment?
The two main licensed treatments for male pattern baldness in the UK are topical minoxidil and oral finasteride. Both tend to work best, and are most likely to maintain or regrow hair, when started at an earlier stage, broadly stages 2 to 4, while there are still enough active follicles in the affected area to respond.
At later stages, such as 6 or 7, where follicles in the thinning areas may have been inactive for a long time, both treatments are more likely to help slow further loss in the remaining areas than to regrow hair that has already gone. This is one of the reasons clinicians generally recommend starting treatment, if you are going to, sooner rather than later.
Minoxidil is applied directly to the scalp and is thought to prolong the growth phase of hair follicles. Finasteride is taken as a tablet and works by reducing the amount of DHT in the body. Some men use the two together after a consultation confirms this is suitable for them; others use just one. Which approach, if any, is appropriate depends on your stage, your medical history and what you are hoping to achieve, which is why a consultation with a clinician is the first step rather than ordering a product directly.
When thinning hair is not male pattern baldness
Not every change in hair density follows the Norwood pattern. Patchy hair loss, sudden shedding, scalp irritation, or hair loss that does not follow the typical temple-and-crown pattern can have other causes, including thyroid conditions, iron deficiency, certain medications, stress-related shedding (telogen effluvium), or scalp conditions such as alopecia areata. These do not fit neatly onto the Norwood scale and are assessed differently.
If your hair loss has come on quickly, is patchy rather than following a receding hairline or thinning crown, or is accompanied by scalp soreness, scaling or other symptoms, it is worth getting this checked rather than assuming it is standard male pattern baldness. A general practitioner or pharmacist can help rule out some of these other causes, particularly where there are additional symptoms such as tiredness, changes in weight or visible scalp inflammation.
Lifestyle factors and setting realistic expectations
No shampoo, supplement or styling change will reverse genuinely hereditary hair loss on its own, though general scalp and hair health (a balanced diet, avoiding excessive heat styling or tight hairstyles that pull on the hairline, and managing stress where possible) is worth maintaining regardless. Claims that a particular product can "regrow a full head of hair" at any stage should be treated with caution; the evidence base for male pattern baldness sits almost entirely with the two licensed treatments discussed above, used consistently and, where relevant, long term.
It is also worth knowing that stopping either minoxidil or finasteride typically means any hair gained while using it will gradually be lost again over the following months, since neither treatment changes the underlying genetic tendency. This is a normal part of how they work rather than a sign that something has gone wrong.
Getting an accurate assessment
You do not need to self-diagnose your exact Norwood stage before seeking advice. A photograph of your hairline and crown from a few angles, along with some background on when you first noticed changes and whether close relatives have experienced similar patterns, gives a clinician enough to assess your pattern, discuss realistic expectations, and recommend options that are appropriate, subject to suitability.
Starting the conversation earlier, even at stage 2 or 3, keeps more options open than waiting until the pattern is well established, since treatment tends to work with the hair follicles you still have rather than replacing the ones you have lost.
Frequently asked questions
What Norwood stage is considered the point to start treatment?
There is no single stage at which treatment becomes necessary, but many clinicians point to stage 3 as a reasonable time to start discussing options, since this is generally the first stage considered clinically significant and treatments tend to work best while follicles are still active.
Can you go from stage 2 to stage 7 quickly?
It is uncommon but possible. Most men progress gradually over years rather than months, and some stay at an early stage indefinitely. Rate of progression varies a great deal between individuals and is not something the Norwood scale itself predicts.
Is the Norwood scale used for women's hair loss too?
No. Women's pattern hair loss typically causes diffuse thinning across the top of the scalp rather than a receding hairline, and is usually assessed using a different system, the Ludwig scale.
Does a higher Norwood stage mean treatment will not work at all?
Not necessarily, but expectations should be realistic. At later stages, treatment is more likely to help maintain the hair you still have than to regrow hair in areas that have been thinning for a long time. A clinician can give you a more specific view based on your scalp.
Can stress cause a pattern that looks like Norwood stages?
Stress-related hair loss (telogen effluvium) usually causes more general thinning or shedding across the scalp rather than the temple-and-crown pattern the Norwood scale describes, though the two can occur together in some men.