Pattern hair loss is the slow, zonal thinning driven by an inherited sensitivity to a hormone called DHT, and it is by far the most common reason hair gets thinner with age. In men it recedes at the temples and thins at the crown. In women it widens the parting while the hairline usually holds. It is gradual, it is progressive, and the single biggest factor in how much hair you keep is how early you work out that this is what you have.

What follows is the honest version: the mechanism, the two staging scales, how fast it actually moves, and what the realistic options are. We sell cosmetics, so you will notice we are careful about the difference between what a shampoo does and what a medicine does. That distinction is the most useful thing on this page.

Last updated: August 2026. General information for adults, not medical advice.

What is pattern hair loss?

Pattern hair loss, known clinically as androgenetic alopecia, is a gradual shrinking of hair follicles in specific zones of the scalp. The follicles do not die and fall out. They miniaturise, which means each successive growth cycle produces a hair that is a little finer, a little shorter and a little lighter in colour than the last one.

Every hair follicle runs a cycle: a growing phase lasting two to seven years, a brief transition, and a resting phase of a few months before the hair is released and a new one begins. Miniaturisation shortens the growing phase. A follicle that once ran a six year anagen phase might drop to two years, then to a few months. Because the length a hair reaches depends on how long it grows for, the hair gets progressively shorter as well as thinner, until eventually it is a colourless wisp barely a centimetre long, then nothing visible at all.

The driver is dihydrotestosterone, or DHT, an androgen made from testosterone by an enzyme in the skin. DHT is not the villain of the story: everyone has it, levels are normal in most people with pattern loss, and it does useful work elsewhere in the body. What differs is receptor sensitivity in the follicle, and that is inherited. Follicles at the temples and crown carry more androgen receptors than the ones around the back and sides, which is precisely why the pattern is a pattern, and why hair transplanted from the back keeps growing when moved to the front. The fuller mechanism is in our guide to what triggers androgenic alopecia.

How is pattern hair loss different from shedding and breakage?

Three different problems get called the same thing, and the answers to them have almost nothing in common. This is the single most useful table on the page.

The mixed picture is common: plenty of people have it quietly progressing underneath a sudden bout of shedding that made them notice it. If your hair started coming out in handfuls after an illness, a birth, a crash diet or a bereavement, read our guide to telogen effluvium first, because that part usually resolves on its own.

What does male pattern loss look like?

Male pattern loss follows the Norwood scale, a seven stage map published in the 1970s that is still the standard way of describing progression.

1. Stage 1. No meaningful recession. The adolescent hairline.
2. Stage 2. Slight recession at the temples, giving the mature hairline most men develop in their twenties. Very often not pattern loss at all.
3. Stage 3. The first stage generally accepted as balding: deeper temple recession, or a distinctly thinning crown.
4. Stage 4. More pronounced recession plus a thinning crown, with a solid band of hair still separating them.
5. Stage 5. Both zones enlarge and the band between them narrows and thins.
6. Stage 6. The band is gone. Front and crown join up.
7. Stage 7. Hair remains only in a horseshoe at the sides and back.

Two things about the scale are worth knowing. First, most men never reach stage 6 or 7. Second, the crown often starts thinning before the hairline does anything dramatic, and because you cannot see the back of your own head, it is regularly a year or two ahead of where people think they are. A phone camera and a mirror is the fix, and our guide to crown thinning covers what to look for.

What does female pattern loss look like?

The female version produces a completely different picture from the male version despite the same underlying mechanism. The hairline is usually preserved. The thinning is diffuse across the top of the head and most visible as a widening parting, which is why the standard staging is the three point Ludwig scale rather than Norwood.

The practical test most women use without being told to is the parting width. Part your hair in the same place, in the same light, and photograph it every month. A parting that is visibly wider at the front than at the crown is the classic Christmas tree pattern. We go through the staging in detail in our guide to the Ludwig scale.

The reassuring part is that women almost never progress to baldness. The less reassuring part is that female pattern loss frequently arrives entangled with something else that is also affecting hair, such as low iron, thyroid changes, the perimenopause or polycystic ovary syndrome. That entanglement is exactly why a GP visit is more valuable for women than for men: some of the contributing factors are adjustable and a blood test costs nothing.

Why do some people get it and others do not?

Inheritance decides it, and it is polygenic rather than a single switch. Genome-wide studies have identified hundreds of loci associated with male pattern baldness, some on the X chromosome and many not. This is why the old rule about looking at your mother's father is wrong: it is not that he is irrelevant, it is that he is one data point among many. Look at your father, your brothers, your uncles on both sides and your grandfathers, and you get a far better forecast than any single relative gives you.

Age matters because miniaturisation is cumulative. Hormones matter because androgens are the signal, which is why it does not begin before puberty and why pattern loss in women often becomes noticeable around the menopause, when the ratio of circulating hormones shifts. Smoking has been repeatedly associated with earlier and more severe loss in observational work, although observational studies cannot settle cause. Stress does not cause it, though it very effectively causes the shedding that makes people notice it.

What does not cause it: hats, washing your hair too often, wearing your hair long, hair dye, or blocked follicles. These come up constantly and none of them have anything to do with the mechanism.

How fast does pattern hair loss progress, and can you predict it?

Speed varies enormously between individuals and is the hardest thing to predict. Some men move a Norwood stage in two years, others take twenty, and the same man can be static for a decade and then move quickly. Two rough rules hold up. Earlier onset generally predicts more extensive eventual loss, so someone receding noticeably at twenty is on a different trajectory from someone doing the same at forty. And family history is a better forecast than any test.

Because it is slow, self-assessment by memory is close to worthless. Almost everyone who compares a photograph from three years ago to the mirror is surprised in one direction or the other. Photographs on a fixed schedule are the only honest measurement, and taking them costs nothing.

What can you actually do about pattern hair loss?

Here is the landscape, in descending order of how much evidence sits behind each tier. Note where we are on it.

Licensed medicines. There are medicines licensed in the UK for it, some available from a pharmacist and some only through a GP. They work by interrupting the hormonal signal or by extending the growth phase, they work only while you take them, and they carry side effect profiles that are worth understanding properly before starting. We are a cosmetics company with no medical professional on record, so we are not going to name them or advise on them. That is a conversation with a pharmacist or GP, and it is a genuinely useful one.

Procedures. Hair transplantation moves follicles from the resistant zone at the back to the thinning zone at the front. It is the only intervention that puts hair where there is currently none. It is expensive, it is surgery, transplanted hair persists while surrounding native hair can carry on thinning, and the quality of clinics varies enormously. Check the qualifications of whoever would actually perform it, not just the brand on the door.

Devices. Low level light therapy caps and combs have a real body of published work behind them and a real problem with it: a large share of the trials are funded by device manufacturers, wavelengths and doses differ between studies, and independent reviewers reach different conclusions from the same evidence. Plausible, expensive, contested.

Cosmetics. Shampoos, conditioners and scalp products protect the hair you currently have and change how it looks. They reduce breakage, they support a healthy scalp environment, and they make hair look fuller. They do not change follicle behaviour, and anyone telling you a rinse-off product alters your hormones is selling you something.

Concealers. Keratin fibres and root sprays hide a visible scalp in thirty seconds and wash out. Nothing underneath changes. For anyone who wants to feel fine at an event on Saturday rather than in six months, this is the honest recommendation.

Where do our own products fit?

Tier four, and the front half of tier five. Nowhere near tiers one to three, and we would rather say so than imply otherwise.

Grow Me and Grow More Set, the day and night cosmetic routine

A biotin, caffeine and rosemary shampoo plus a leave-on overnight scalp elixir. The elixir is the part worth explaining: a shampoo has about two minutes of contact time, a leave-on product has eight hours. If you are going to judge a cosmetic routine over ninety days, judge one that actually stays on your head.

Hair Building Fibres, the thirty second answer

Keratin fibres that cling to existing hair and hide the scalp showing through at a parting or crown. It washes out, it changes nothing underneath, and it is the single most immediately effective thing on this page for how you feel walking into a room.

GrowPro Hair Gummies, with the caveat attached

Biotin, zinc, selenium and B vitamins. Nutrients contribute to the maintenance of normal hair, and that is the honest claim. If you have not had a blood test yet, have the blood test first: correcting a deficiency you actually have beats topping up one you do not, and high dose biotin can interfere with some blood test results.

Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary. We are vegan, UK made, and have sold over 5 million bottles since 2012.

How should you test whether anything is working?

The method matters more than the choice, because the condition moves slowly enough that wishful thinking fills the gap.

Photograph on day one. Hairline, parting, crown and one from directly above. Same window, same time of day, dry hair, parted identically. Then monthly, in the same conditions.

Give it ninety days minimum, six months preferably. Anything aimed at follicle behaviour has to wait for a full growth cycle to show. A verdict at four weeks is a verdict on nothing.

Change one thing at a time. Starting four things at once means that in six months you will know something changed and have no idea what did it, and you will keep paying for all four.

Expect an initial increase in shedding from anything that shifts the cycle. It is common, it is usually temporary, and it panics people into stopping at exactly the wrong moment.

Frequently asked questions

At what age does pattern hair loss start?

Any time after puberty. Temple recession in the early twenties is extremely common and is often just the mature hairline rather than progressive loss. Earlier genuine onset tends to predict more extensive eventual loss, which is the main argument for taking early notice seriously.

Do women go bald from pattern hair loss?

Very rarely. Female pattern loss thins the top of the head diffusely and widens the parting, but the hairline is usually preserved and complete baldness is unusual. Density can drop enough to be genuinely distressing without ever approaching the male picture.

Can pattern hair loss be stopped?

There is no permanent fix. Licensed medicines can slow progression substantially and can thicken recently miniaturised follicles while they are being used, which is why early action preserves more than late action. Follicles that have been dormant for years are much less responsive to anything.

Is pattern hair loss from my mother's side?

Both sides. Hundreds of genetic loci are involved, some on the X chromosome that you get from your mother and many elsewhere. Looking only at your maternal grandfather is a myth that has survived because it is memorable, not because it is accurate.

Does a shampoo stop pattern loss?

No rinse-off product meaningfully changes hormone signalling at the follicle. Shampoo cleans the scalp, reduces breakage and changes how hair looks and behaves. Those are real benefits and they are not the same as changing the trajectory.

Can wearing hats or washing my hair cause it?

Neither does. Hats do not suffocate follicles and washing does not accelerate loss. Hairs come out during washing because they were already released by the cycle, so washing less just batches them up for the next wash.

Why has my hair suddenly come out in handfuls?

Sudden diffuse shedding is not pattern hair loss. It is usually telogen effluvium, triggered two to three months earlier by illness, surgery, childbirth, a crash diet, severe stress or a new medication, and it typically recovers by itself. Round, smooth bald patches are a different condition again and warrant a GP.

Is it worth seeing a GP if I am certain it is pattern loss?

For women, yes, because low iron, thyroid problems and hormonal conditions frequently sit alongside it and are worth identifying. For men, it is worth it if you want to discuss licensed options, if there is any doubt about the pattern, or if there is scalp symptom such as pain, scaling or smooth shiny patches.

Sources and references

• NHS guidance on hair loss, for what is available on the NHS, what is not, and the presentations that warrant a GP appointment.
• NICE Clinical Knowledge Summaries on androgenetic alopecia, for the distinguishing clinical features and the standard management sequence in UK general practice.
• British Association of Dermatologists public information on male and female pattern loss, for the staging descriptions and the expected course.
• Norwood's 1975 classification of male pattern baldness and Ludwig's 1977 three grade classification of female pattern loss, the two scales still in standard use.
• Genome-wide association studies of male pattern baldness, which have identified several hundred associated loci across many chromosomes rather than a single X-linked gene.
• Published work on androgen receptor density and 5-alpha-reductase activity in scalp follicles, for why occipital follicles resist miniaturisation and therefore why transplantation works.
• Systematic reviews of low level light therapy in androgenetic alopecia, including the repeated criticism that a large share of trials are industry funded and heterogeneous in wavelength, dose and duration.
• UK and EU authorised nutrition claims, for the permitted wording that nutrients contribute to the maintenance of normal hair.

The short version

Pattern hair loss runs on two clocks: your genes set the speed and your reaction time sets the outcome. Work out first whether what you have is actually pattern loss rather than shedding or breakage, because the answers are completely different. Place yourself on Norwood or Ludwig honestly, take four photographs today, and repeat them monthly, because memory is a terrible instrument for something this slow. If you want to discuss licensed medicines, that is a GP or pharmacist conversation and worth having early rather than late, because recently miniaturised follicles respond and long dormant ones largely do not. Cosmetics protect what you have and change how it looks, which is worth real money and is not the same as changing the trajectory. And if you need to feel fine next Saturday rather than next spring, a concealer does that in thirty seconds and nobody should feel odd about it.