Male Pattern Hair Loss (androgenetic alopecia)
Male pattern hair loss is driven by genetic sensitivity of hair follicles to DHT. It is progressive without treatment, but finasteride and minoxidil — used consistently — stop or partially reverse it in most men. Transplantation relocates DHT-resistant hair and works best once loss has stabilised on medical therapy.
How pattern loss progresses (Norwood stages)
The Norwood-Hamilton scale describes the typical progression, from stage I (no visible recession) through stage II-III (temple recession forming an "M" shape), stage IV-V (recession combines with crown thinning, separated by a band of hair), to stage VI-VII (only a horseshoe of hair remains at the sides and back). Progression speed varies enormously between individuals — some men stay at an early stage for decades, others progress through several stages within a few years — but the direction is always the same without treatment, since it is driven by genetically determined follicle sensitivity to DHT that doesn't change on its own.
Medical treatment: what the evidence actually shows
Finasteride (1mg daily) reduces DHT at the follicle and has the strongest evidence of any oral treatment for slowing and partially reversing male pattern loss — most men see stabilisation, and a meaningful proportion see visible regrowth, typically apparent by 6–12 months. Topical minoxidil works through a different mechanism (improving blood flow and extending the growth phase) and is a reasonable first step or add-on, particularly for men who prefer to avoid an oral medication. Combining both outperforms either alone in most studies. Neither treatment works if stopped — benefits are maintained only with continued use.
Transplant timing — why 'too early' is a real mistake
A hairline transplanted at 24 will look wrong at 40 if the native hair around and behind it keeps receding — the transplanted hair stays put (it's DHT-resistant, moved from the back and sides), but the surrounding original hair does not, eventually creating an unnatural, isolated patch. This is why surgeons generally want loss stabilised on medical therapy for at least a year before operating, and why a conservative, slightly-higher hairline design in a young patient is usually better surgical judgement than an aggressive low one, since donor hair is a finite, non-renewable resource that has to last decades.
Frequently asked questions
At what age does male pattern baldness start?
It can begin any time after puberty; onset in the 20s is common. Earlier onset generally predicts more extensive eventual loss — and is a stronger reason to start treatment early, not to wait.
Does finasteride have permanent side effects?
Side effects (reduced libido, erectile changes) occur in a small minority and resolve on stopping in the vast majority of cases. Persistent symptoms are rare in the literature. This decision deserves an individual risk discussion with a doctor rather than a forum verdict.
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