Male pattern baldness is most often classified using the Norwood scale, which runs from stage 1, no significant loss, to stage 7, extensive loss with only a band of hair remaining around the sides and back. The early stages show a maturing or receding hairline, the middle stages add thinning at the crown, and the later stages connect the two into a larger bald area. Knowing your stage matters, because it largely determines which treatments will actually help, and earlier stages have the most options.
What causes male pattern baldness?
Male pattern baldness is driven by genetics and the hormone DHT (dihydrotestosterone). In genetically sensitive men, DHT gradually shrinks affected follicles in a process called miniaturization. Each growth cycle produces a finer, shorter, weaker hair until the follicle eventually stops producing visible hair altogether. This is why the process is gradual and follows a predictable pattern rather than happening all at once.
Crucially, the follicles on the sides and back of the scalp are usually resistant to DHT, which is why those areas keep hair the longest and why they are the donor sites used in transplants.
The stages of male pattern baldness (the Norwood scale)
The Norwood scale is the standard way clinicians describe the progression. Simplified, it looks like this:
- Stage 1: No significant hair loss. A full, juvenile hairline.
- Stage 2: A maturing hairline, with slight recession at the temples. Often normal and subtle.
- Stage 3: The first clearly recognizable stage of balding, with deeper temple recession forming an "M" or "U" shape. A "Stage 3 vertex" variant adds early crown thinning.
- Stage 4: More pronounced hairline recession plus a defined area of crown (vertex) thinning, with a band of hair still separating the two.
- Stage 5: The hairline and crown areas grow larger and the separating band gets narrower.
- Stage 6: The band between hairline and crown is largely gone, connecting the two balding zones.
- Stage 7: The most advanced stage, with hair remaining only in a band around the sides and back.
Most men progress slowly through these stages over years, and not everyone reaches the later ones.
At what age does male pattern baldness start?
Male pattern baldness can begin any time after puberty, and commonly starts in the 20s and 30s. The likelihood increases with age, with a large share of men showing some pattern loss by their 50s. Starting young can feel discouraging, but it is best understood as an early warning that gives you the most time to act while follicles are still alive and responsive. If you are noticing changes, our guide to why your hair is thinning can help you confirm the cause.
Can male pattern baldness be reversed?
Early to mid-stage male pattern baldness can often be meaningfully improved, while fully bald late-stage areas usually cannot be revived without surgery. The reason is simple: treatments that stimulate or protect follicles need living follicles to work with. In the earlier Norwood stages, miniaturizing follicles are still present and can often be pushed back toward healthier growth. Once a follicle is gone, only transplantation can place hair there. This is the single biggest reason to act early.
What actually helps male pattern baldness?
The evidence-based options, roughly from least to most invasive, are:
- Finasteride and minoxidil: Medications that slow loss and can regrow some hair, requiring ongoing use. See FoLix vs. finasteride and minoxidil.
- FoLix laser: The first FDA-cleared fractional laser for hair loss, which stimulates dormant follicles without drugs or surgery and works best in early to mid stages. Learn what FoLix is and how it works.
- PRP (platelet-rich plasma): Uses growth factors from your own blood to support follicles. Compare in FoLix vs. PRP.
- Hair transplant: Surgically relocates DHT-resistant follicles to balding areas, best suited to more advanced or stable loss. Compare in FoLix vs. hair transplant.
Many men combine approaches, for example using a laser or medication to protect existing follicles. The right plan depends on your Norwood stage, which is exactly what a physician evaluation determines.
This article is educational and not a substitute for personalized medical advice.