Male pattern baldness: causes, stages, and solutions
Baldness affects a large portion of men during their lives, to varying degrees and at very different ages. Understanding the real causes and its typical progression helps to better grasp the situation and to choose a solution based on informed decision-making rather than urgency or anxiety. This article provides a rigorous overview, without replacing medical advice.
What is baldness?
Male pattern baldness corresponds, in the vast majority of cases, to androgenetic alopecia: a progressive and genetically programmed hair loss, linked to the sensitivity of hair follicles to a hormone derived from testosterone, dihydrotestosterone (DHT). Under the influence of this hormone, the follicles located in certain areas of the scalp gradually miniaturize: the hair they produce becomes finer.
This mechanism explains why baldness generally follows a specific pattern: it most often spares the back and sides of the scalp (as the follicles in this area are less sensitive to DHT), while it preferentially affects the temples, the top of the scalp (vertex), and the frontal hairline.
The causes of male pattern baldness
Genetics is the main determining factor: androgenetic alopecia is hereditary, involving a complex genetic component that is not linked to one particular parent, contrary to a common misconception.
Hormones, particularly individual sensitivity to DHT, explain why two men with comparable hormonal levels can have very different hair progression: it is the sensitivity of the follicles, more than the hormonal level itself, that plays the primary role.
Age also plays a role, as the probability and extent of baldness generally increase over the years, although the age of onset varies greatly from one man to another. Some notice the first signs in their twenties, others much later.
Other factors such as significant stress, nutritional deficiencies, certain medications, or thyroid disorders can cause or accentuate hair loss, but these usually involve mechanisms different from androgenetic alopecia (diffuse or temporary hair loss), which require medical advice to be correctly identified.
Stages of baldness: the Norwood scale
The progression of male androgenetic alopecia is generally described using the Norwood-Hamilton scale, a classification tool long used in dermatology to determine the stage of baldness. It schematically distinguishes several stages:
- a slight recession of the temples, often the first observable sign;
- a deepening of the temples, associated with the appearance of a thinning area at the vertex;
- a progressive junction between the receding frontal area and the vertex, as the band of hair separating them thins;
- advanced stages, where only a horseshoe of hair remains on the sides and back of the scalp.
This progression is neither systematic in its pace nor necessarily complete: it can stabilize at any stage, and its speed of progression varies enormously from one man to another.
The first signs to watch for
Before a bald patch becomes visible, several signs often precede the progression: more hair loss than usual when washing or brushing, a scalp that becomes more visible under certain lighting, or a gradual recession of the frontal hairline. These signs do not automatically mean progressive baldness, but they warrant special attention, or even professional advice if doubt persists.
When to consult a healthcare professional
It is important to remember that KAPILLUS is not a medical practice, and no information in this article replaces medical advice. A consultation with a doctor or dermatologist is recommended, particularly if the hair loss is sudden, localized in patches, associated with itching, redness, or scalp pain, or if it occurs in an unusual context (after an illness, medication, or a significant life event). These situations may correspond to causes other than classic androgenetic alopecia and deserve an appropriate medical diagnosis.
The main categories of existing solutions
Once the cause is identified, several categories of solutions exist, each with a different logic:
Medications (such as minoxidil or finasteride) aim to slow down hair loss or stimulate regrowth in certain profiles, with results varying from person to person and requiring long-term use.
Hair transplantation involves harvesting DHT-resistant follicles (usually from the back of the scalp) and re-implanting them into thinning areas. It is a surgical solution, the final result of which is assessed over several months.
Hair replacement systems (or hair prostheses) offer a non-surgical, immediate, and reversible solution that covers the affected areas with a natural look, without acting on the biological cause of baldness.
Scalp micropigmentation offers a different approach by depositing pigments to imitate either a shaved head effect or increased visual density.
Each of these approaches meets different expectations regarding results, reversibility, waiting time, and budget. We detail this comparison thoroughly in our guide on scalp micropigmentation.
Key takeaways
Male pattern baldness results, in the vast majority of cases, from a well-identified genetic and hormonal mechanism, with a progression that is gradual and varies between individuals. Understanding one's stage and probable cause is the first step before choosing a solution. This is a step that KAPILLUS supports through a hair diagnosis, without ever substituting for medical advice when needed.
