What Is Male Pattern Baldness?
Part of the Access Doctor Male Hair Loss guide.
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Male pattern baldness — medically termed androgenetic alopecia — is the most common form of hair loss in men, accounting for around 95% of male hair loss cases. It follows a characteristic, progressive pattern and is caused by the interaction of genetic factors and the hormone dihydrotestosterone (DHT).
Despite being so prevalent, it remains a source of significant concern for many men. The good news is that it is also one of the most treatable hair loss conditions — particularly when addressed early.
95%
of hair loss cases in men are androgenetic alopecia — male pattern baldness
66%
of men are affected by age 35
85%
of men affected by age 50
What Causes Male Pattern Baldness?
Male pattern baldness is driven by two interacting factors: genetics and hormones. The genetic component is inherited from both sides of the family — contrary to the common belief that hair loss only comes from your mother's side. The condition is polygenic, meaning multiple genes contribute, which explains why patterns can vary so markedly even within families.
Genetics
Inherited from both sides of the family. Polygenic — multiple genes determine susceptibility and pattern. Not just from your maternal grandfather.
DHT Sensitivity
Genetically determined sensitivity of scalp follicles to DHT. The same DHT level can cause severe hair loss in one man and none in another.
Age
The process begins in genetically susceptible men as early as their teens. The probability and severity of hair loss increase progressively with age.
Hormonal Status
Testosterone levels influence DHT production. Other hormonal conditions can compound genetic hair loss or cause separate, distinct types of hair loss.
The Role of DHT
Dihydrotestosterone (DHT) is a potent androgen hormone formed when testosterone is converted by the enzyme 5-alpha reductase. In men with a genetic predisposition, scalp hair follicles have androgen receptors that are highly sensitive to DHT. When DHT binds to these receptors, it disrupts the normal hair growth cycle:
- The anagen (growth) phase shortens — each hair grows for less time before shedding
- The follicle gradually miniaturises — producing progressively thinner, shorter, lighter-coloured hairs
- Eventually the follicle enters a dormant state and stops producing hair altogether
This is why finasteride is so effective: it inhibits 5-alpha reductase, reducing scalp DHT by up to 70% and halting the miniaturisation process.
The Norwood Scale: Stages of Male Pattern Baldness
The Hamilton-Norwood scale is the standard classification system used to describe the extent of male pattern baldness, from minimal recession to extensive baldness:
| Norwood Type | Description | Finasteride suitability |
|---|---|---|
| Type I | No significant recession — a mature hairline without hair loss | Preventive use possible |
| Type II | Slight recession at the temples; early signs of thinning at the vertex | ✓ Ideal — early intervention |
| Type III | More pronounced recession forming an M, W or U shape at the front | ✓ Highly suitable |
| Type IV | Significant frontal and crown thinning; thin bridge of hair separating the two areas | ✓ Suitable — good results typical |
| Type V | Frontal and crown areas beginning to merge; sparse coverage remaining | ⚠ Suitable — results more variable |
| Type VI | Frontal and crown areas fully merged into extensive baldness | ⚠ Limited response at bald areas |
| Type VII | Most severe — only horseshoe of hair remaining at sides and back | ✗ Limited benefit to bald areas |
Why early treatment matters: The Norwood scale makes clear why early treatment yields the best outcomes — at Types II–IV, most follicles are still active and responsive to DHT suppression. Waiting until Type VI or VII significantly reduces what treatment can achieve.
Symptoms and Early Signs
Male pattern baldness develops gradually. The earliest signs to watch for include:
- A hairline beginning to recede at the temples — the “widow’s peak” or “M-shape” recession
- Increasing visibility of the scalp at the crown when viewed from above
- Hairs becoming progressively finer, shorter, and lighter in colour
- Increased shedding noticeable on pillows, in the shower, or on clothing
- A change in how your hair “fills” your usual hairstyle
Act promptly: If you notice any of these signs, it is worth acting promptly. Finasteride is most effective when started before significant follicle miniaturisation has occurred.
The Emotional Impact of Hair Loss
Many men find hair loss affects their confidence, self-image, and emotional wellbeing — sometimes significantly. Research consistently shows that androgenetic alopecia can impact quality of life, social confidence, and in some cases contribute to anxiety or low mood. These feelings are entirely valid and should not be minimised.
Seeking treatment is a practical, positive response. Many men report that taking action — whether through medication, lifestyle changes, or a combination — substantially improves how they feel about their hair and themselves. There is no need to simply “accept” hair loss if effective, safe, well-evidenced treatments are available.
Can Male Pattern Baldness Be Treated?
Yes — and the evidence for available treatments is strong. The two MHRA-approved first-line options are:
- Finasteride 1mg daily — prescription oral tablet. Blocks DHT. 85% improvement rate over 5 years. Suitable for Norwood Types II–V.
- Minoxidil 5% (Regaine) — over-the-counter topical solution or foam. Applied twice daily. Most effective combined with finasteride.
Read our detailed guide: Male Balding: Your Complete Treatment Guide — covering finasteride vs minoxidil, hair transplants, laser therapy, and more.
Prescription · Rx
Finasteride 1mg
MHRA-approved oral tablet. Reduces scalp DHT by up to 70%. 85% improvement rate over 5 years.
Order Finasteride →Prescription · Rx
Propecia (Branded)
Branded finasteride 1mg. Same active ingredient and clinical evidence as generic.
Order Propecia →Over the Counter
Regaine for Men
Minoxidil 5% extra strength solution. Stimulates follicles. Best combined with finasteride.
View Regaine →Access Doctor provides prescription finasteride following a short online assessment. No GP referral required. Discreet next-day delivery.
View All Hair Loss Treatments →Frequently Asked Questions
What is male pattern baldness?
Male pattern baldness (androgenetic alopecia) is the most common form of hair loss in men, caused by a genetic sensitivity to DHT. It follows a recognisable pattern of hairline recession and crown thinning, classified by the Norwood scale, and affects around 66% of men by age 35.
Is male pattern baldness hereditary?
Yes — male pattern baldness is strongly genetic, inherited from both sides of the family. It is polygenic, meaning multiple genes contribute. Having a father or maternal grandfather with significant hair loss substantially increases your own risk — but absence of family history does not guarantee immunity.
What is the Norwood scale?
The Norwood (Hamilton-Norwood) scale is the standard classification for male pattern baldness, rating hair loss from Type I (no significant recession) to Type VII (extensive baldness). It helps prescribers assess severity and recommend the most appropriate treatment at each stage.
Can male pattern baldness be stopped?
Yes — finasteride significantly slows or stops progression by reducing scalp DHT levels by up to 70%. 85% of men show improvement over 5 years. Early treatment at Norwood Types II–IV yields the best results.
Does male pattern baldness affect self-esteem?
Many men find hair loss affects confidence and emotional wellbeing — this is entirely valid. Research shows androgenetic alopecia can impact quality of life and social confidence. Seeking effective treatment is a positive response that many men find meaningfully improves their sense of wellbeing.
At what age does male pattern baldness typically start?
It can begin as early as the late teens. Around 25% of men with hereditary hair loss show signs before age 21. By 35, approximately 66% of men are affected; by 50, over 85%. The earlier it starts, the more important it is to seek treatment promptly.
References
- NICE. Alopecia — androgenetic. Clinical Knowledge Summaries. cks.nice.org.uk/topics/alopecia
- Cranwell W, Sinclair R. Male Androgenetic Alopecia. Endotext. 2016. ncbi.nlm.nih.gov/books/NBK278957
- NHS. Hair loss. nhs.uk/conditions/hair-loss
- Norwood OT. Male pattern baldness: classification and incidence. Southern Medical Journal. 1975;68(11):1359–65. pubmed.ncbi.nlm.nih.gov/1188424
- Blumeyer A, et al. Evidence-based guideline for the treatment of androgenetic alopecia. Journal of the German Society of Dermatology. 2011. pubmed.ncbi.nlm.nih.gov/21980982
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional regarding your symptoms and treatment. Finasteride is a prescription-only medicine — a clinical consultation is required before it can be dispensed. In a medical emergency, call 999.