Reference
Hair loss stages, plainly.
Tap any stage below to see what it looks like, how common it is, and which treatments work at that stage. Toggle to the female (Ludwig) scale if relevant.
Norwood–Hamilton Scale
Click a stage to see what it looks like and what to do
Stage 1: No visible loss
Adolescent / pre-progression hairlineNo recession, juvenile hairline. The baseline before any pattern hair loss starts. Some men stay here for life.
Prevalence
~30% of men age 30
Treatment options
No treatment indicated. Monitor if family history is strong.
Not medical advice. See all treatments · Ask a question
How to use these scales
Self-staging is usually one notch optimistic. The mirror is biased toward minimising what we don't want to see, and most progression happens at the back of the head where you can't observe it directly. If you're unsure, take a clear top-of-head photo under good light and compare to the stages above.
The stage you're at when you start treatment is roughly the best result medical therapy can preserve. Treatment doesn't move you back down the scale dramatically. Finasteride and minoxidil can produce visible regrowth in 60–80% of users, but the underlying density never quite returns to a younger stage. Earlier treatment = higher final density.
For deeper context, see our articles on the Norwood classification system and the Ludwig vs Sinclair scales for women.
Common questions
What is the Norwood scale?
The Norwood–Hamilton scale is the standard 7-stage clinical classification of male pattern hair loss. Hamilton developed the original framework in 1951; Norwood refined it in 1975.
What is the Ludwig scale?
The Ludwig scale is the 3-stage classification used for female pattern hair loss. It focuses on diffuse central scalp thinning. The frontal hairline is typically preserved, in contrast to male pattern progression.
At what stage should I start treatment?
Most hair specialists recommend starting medical therapy by Norwood 3 (or Ludwig I), when pattern loss becomes clear. Earlier = better long-term outcomes because preserving existing follicles is easier than recovering miniaturised ones.
Can I move backwards on the scale with treatment?
Not dramatically. Treatment can densify existing hair and produce visible regrowth, but established baldness (Norwood 5+) rarely reverses to Norwood 3 with medical therapy alone. Hair transplantation is needed to genuinely reverse late-stage loss.