Hair Library · Hair Loss
Why male pattern baldness happens, the age it usually starts, how to tell it from a mature hairline or shedding, and what medicines and a transplant can and cannot do.
Written by Nazmi Güldeş, Certified Trichologist · Medically reviewed by Dr. Teuku Adifitrian, Sp.BP-RE (Dr. Tompi), Plastic, Reconstructive and Aesthetic Surgeon · Last reviewed 31 October 2026
Reading levelMale pattern baldness is inherited hair loss that follows a set route: the hairline recedes at the temples, the crown thins, and at the most advanced stage only a horseshoe of hair is left at the sides and back. It starts after puberty and moves slowly, which gives you time to act.
The key fact for anyone who notices it early is that treatment is better at stopping loss than at bringing hair back. So the sooner you know what you're dealing with, the more you keep.
Male pattern baldness, or androgenetic alopeciaGlossaryAndrogenetic alopecia, or pattern baldness, is the pattern hair loss behind most male and female thinning. It is primarily driven by genetic predisposition and sensitivity to androgen hormones.
Open in the glossary →, is inherited hair loss in which follicles on the top of the scalp shrink and grow finer, shorter hairs. Male hormones drive the change in follicles that are genetically sensitive to them. It's common: in a US community sample, 42% of men aged 18 to 49 had moderate to extensive loss.[1]
It's the most common form of hair loss in men, and a 2025 review names a hair transplant, finasteride tablets and minoxidil on the scalp as effective treatments. The female form is covered in our female pattern hair loss entry.
Male pattern baldness runs in families, and genes explain most of who gets it. In a study of 205,327 UK men, close-relative data put the genetic share at 62%, spread across 624 gene regions.[2] How it passes down is covered in is baldness genetic?
Not every follicle is affected: in men, those at the front, middle and crown of the scalp are the susceptible ones. In those follicles DHTGlossaryDihydrotestosterone (DHT) is a potent androgen that the body makes from testosterone using an enzyme called 5-alpha reductase. In people who are genetically sensitive to it, DHT makes hair follicles shrink.
Open in the glossary →, a hormone made from testosterone, makes each new hair thinner, shorter and paler.[3] Over many hair cycles the follicles miniaturize: thick hairs are replaced by fine vellus-likeGlossaryVellus hair is the fine, short, pale hair that covers most of the body. It is under 30 micrometres wide and under 2 millimetres long.
Open in the glossary → ones, and some follicles stop producing hair at all. The hormone itself is explained on our DHT and hair loss page.
First signs usually appear in the teenage years, and the condition becomes more common with age, affecting up to 80% of white men at some point.[4] In the US sample, moderate to extensive loss rose from 16% of men aged 18 to 29 to 53% of men aged 40 to 49.
How common it is also varies substantially with ancestry, so figures from one population don't transfer neatly to another.[5] Either way, it becomes more common with age.
Early loss isn't rare: 16% of men aged 18 to 29 already had moderate to extensive loss in that US sample. If that's you, the advice is the same as at any age, only more pressing, because treatment started early gets better results.[6]
It can also weigh on you. Pattern hair loss harms wellbeing for many men, and prompt diagnosis and treatment can improve how you feel about it. Your age changes the surgery question too, which we cover in the treatment section below.
Thinning usually starts at the temples, at the crown, or both, then slowly spreads across the top of the scalp.[7] Watch for these changes:
Doctors grade the pattern on the Hamilton-Norwood scale, the system most used for men. It runs from stage I, with little or no recession, to stage VII, where only a narrow horseshoe of hair remains, and stage III is the first that counts as baldness.
Each stage is shown on our Norwood scale page, and the Norwood test helps you place your own hairline. Treat any single rating as a starting point; the trend over a year tells you more.
Several conditions can look like early balding, and each needs a different response. Match what you see to the closest row; the last two columns are our own advice and summary.
| What you notice | Most likely | First move | What to expect |
|---|---|---|---|
| Temples receding or crown thinning slowly over years, with finer hairs | Male pattern baldness | Photos, then a doctor's view on medicine | Keeps progressing without treatment[8] |
| Hairline slightly higher than in your teens | A maturing hairline | Compare photos over a year | Hairlines change shape as the face matures[9] |
| Sudden, even shedding all over the scalp | Telogen effluvium | Look for the cause | Hair regrows once the cause is removed[10] |
| Smooth, hairless patches | Alopecia areata | See a dermatologist | Patches often regrow on their own |
| Patchy loss with a red, scaly scalp | Tinea capitis, a fungal infection | See a doctor for a fungal check | Confirmed by checking the scalp for fungus |
A hairline that rises a little as you leave your teens isn't always hair loss, because hairlines change shape as the face matures. Pattern loss, by contrast, makes each new hair thinner and shorter, so finer hairs at the edge are a reason to have it checked. Our mature hairline guide shows how to compare photos over time.
Telogen effluviumGlossaryTelogen effluvium is sudden diffuse shedding that follows illness, childbirth or stress. Shedding usually starts two to three months after the trigger, and it is usually self-limiting once the trigger is removed.
Open in the glossary → is sudden shedding spread over the whole scalp, not a slow change in pattern. Once its cause is removed, the hair regrows, so the first step is to find the trigger. Our telogen effluvium entry covers the triggers and recovery.
Sudden loss can also be a diffuse form of alopecia areata, which is one more reason to have heavy shedding checked rather than assume it's balding.
Doctors usually recognise it from its pattern. Trichoscopy, a magnified look at the scalp, is used routinely to confirm it, rule out other conditions, grade it and follow treatment.[3] If the picture is still unclear, a small scalp biopsy may be needed.
Medicines can halt the progression, but at best they regrow part of what was lost, and early treatment does better. A transplant works differently, as the last row shows. The last column is our own summary.
| Treatment | What it does | Effort | Evidence, in short |
|---|---|---|---|
| Finasteride tablet | A 5-alpha reductase inhibitor | One tablet a day | First-line in Japan's guideline[11]; slows loss and regrows some hair |
| Dutasteride capsule | Another 5-alpha reductase inhibitor | One capsule a day | Also first-line in Japan's guideline |
| Minoxidil liquid or foam | Slows loss; regrowth is partial at best | Twice a day on the scalp | First-line in Japan, for men and for women |
| Minoxidil tablet | The same drug, taken by mouth | One tablet a day | Japan's 2017 guideline advised against it |
| Low-level laser or LED | Shines light on the scalp | Repeated sessions | Recommended in Japan, but not first-line |
| PRP injections | Uses a concentrate from your own blood | Clinic visits | An option when medicines haven't worked |
| Hair transplant | Moves androgen-resistant hair from the back of the scalp | One operation, then medicine | Effective; the native hair around it still needs treatment |
Finasteride and dutasteride are 5-alpha reductase inhibitors, a drug class that Italy's guideline, adapted from the European one, lists for this condition.[3] Their main strength is protection. In the finasteride trials, men on placebo lost hair steadily for five years, so a scalp that looks the same after a year of treatment has already beaten the untreated course. How they work, their side effects and how the two compare are covered in their own entries.
Minoxidil is used by both men and women. Japan's guideline recommends the 5% solution twice a day as a first-line treatment for men, and the 1% solution for women.
The same 2017 guideline advised against oral minoxidil. Our minoxidil entry weighs the tablet against the liquid.
Low-level laser and LED devices are among the treatments Japan's guideline recommends. PRP, injections of a concentrate made from your own blood, is something a 2020 review suggests for men who don't respond to medicine.[6] Neither is among the first-line treatments in Japan's guideline. Our PRP for hair loss entry weighs it in detail.
A transplant moves follicles from the back of the scalp, which resist androgens, into thinning areas.[5] The condition keeps progressing in the hair you still have, and a candidacy review stresses explaining this to patients, along with the need for ongoing treatment through adult life.[12] That's why it's worth keeping a medicine going after surgery.
Not everyone is a good candidate. A review of surgical candidacy lists these groups as unsuitable:[12]
The right answer depends on where your hair is now, not only on how much you've lost.
Send us three photos for a free hair analysis, and the medical team will tell you whether your pattern calls for medication, a transplant or both, with no obligation. You can also message us on WhatsApp.
Written by: Nazmi Güldeş, Certified Trichologist. Nazmi Güldeş focuses on patient education around androgenetic alopecia, evaluating miniaturization through dermoscopy, and assessing candidates for medical treatments and hair transplants.
This entry was drafted with the help of AI writing tools and edited by our team, then medically reviewed by Dr. Teuku Adifitrian, Sp.BP-RE (Dr. Tompi) on 31 October 2026. AI is never used as a source: every study cited here was checked against PubMed on 31 October 2026. Key figures are marked with their source, and every source is listed at the end of this entry. Read how we work in our editorial policy.
Check what you remember from this entry. Each answer links back to the section that explains it.
53% of men aged 40 to 49 had stage III or worse, against 16% of men aged 18 to 29. Read the section
Pattern hair loss has a recognizable pattern; trichoscopy, a magnified look at the scalp, is used to confirm it and rule out other causes. Read the section
A transplant moves androgen-resistant follicles, but male pattern baldness keeps progressing in the native hair around them unless it is treated. Read the section
Evidence behind this entry: 12 publications indexed in PubMed (1998 to 2025): 6 reviews, 3 guidelines, 2 clinical studies and 1 randomized trial. 3 sources have free full text.
Every source checked against PubMed on 31 October 2026, including corrections and retractions. See the newest studies on PubMed →
Güldeş, N. (2026, October 31). Male pattern baldness: Causes, age it starts, stages and treatment. Turkey Hair Center Hair Library. https://turkeyhaircenter.com/male-pattern-baldness/
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author = {Güldeş, Nazmi},
title = {Male pattern baldness: Causes, age it starts, stages and treatment},
howpublished = {Turkey Hair Center Hair Library},
year = {2026},
month = oct,
url = {https://turkeyhaircenter.com/male-pattern-baldness/},
note = {Last updated 31 October 2026}
}TY - ELEC AU - Güldeş, Nazmi TI - Male pattern baldness: Causes, age it starts, stages and treatment T2 - Turkey Hair Center Hair Library PY - 2026 DA - 2026/10/31 UR - https://turkeyhaircenter.com/male-pattern-baldness/ N1 - Last updated 31 October 2026 ER -
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