Since the dawn of humanity, hair has been considered a sign of strength and beauty in many cultures. An abundant head of hair is often associated with a charismatic person.
However, many people experience premature hair loss, which is often a painful experience. This phenomenon, known as androgenetic alopecia, affects both men and women, but is more common among men than women.
An hormonal cause
There are several types of hair loss, but androgenic alopecia is a pathology that affects the entire life expectancy of the hair. It is definitive and much more marked in men than in women. The reason is simple and well-known: male hormones.
First of all, the average man has between 100,000 and 150,000 hairs. The scalp is therefore the part of the body where we find the greatest concentration of hair follicles, the cavities in which hair grows. At its base, the dermal straw ensures hair nutrition and healthy growth.
In men, baldness is due to hormones, mainly testosterone. Introduced after puberty, testosterone is responsible for hair loss.
The main cause of hair loss is the scalp’s excessive receptivity to this hormone. An enzyme in the dermal papilla, 5-alpha-reductase, reacts with testosterone to produce another hormone: dihydrotestosterone (DHT).
This hormone imposes an accelerated growth cycle on the hair. The hair follicle will shrink, the hair will grow much thinner and the growth cycles will be exhausted more quickly. The more cycles are consumed, the finer the hair becomes, before it becomes mere down.
At some point, the follicular ostium (where the hair exits) will scar and the hair will no longer be able to grow, as all life cycles will have been exhausted. As a result, men are left with bald patches on their heads.
But why is androgenetic alopecia less common in women? Quite simply, because the ovaries produce ten times less testosterone than the male testicles.
What’s more, some women stop losing their hair during pregnancy, as estrogen discharges neutralize the phenomenon.
How Male and Female Hair Loss Differ
Women do lose hair, but it usually looks different and rarely goes all the way to bald. The pattern is the giveaway:
| Men | Women | |
|---|---|---|
| Where | Hairline and crown | Diffuse thinning across the top, hairline usually preserved |
| How far | Can reach full baldness | Thins but seldom goes completely bald |
| First sign | Receding temples | A widening part line |
| Onset | Often 20s to 30s | More common after menopause |
Estrogen’s Protective Role
The main reason comes down to hormones. Male pattern baldness is driven by DHT, a potent form of testosterone, acting on genetically sensitive follicles. Women have far lower testosterone and much higher estrogen, and estrogen helps keep hair in its growth phase for longer. That hormonal balance is why most women hold onto their hair through the years when many men do not.
When Women Do Lose Hair
The protection is not absolute. Several life stages and conditions can tip the balance:
- Menopause: estrogen drops, and the relative influence of androgens rises, which is when female pattern thinning most often appears.
- PCOS: polycystic ovary syndrome raises androgen levels and can cause thinning in a more male-like pattern.
- After pregnancy: postpartum shedding is common as hormones reset, though it is usually temporary.
- Iron deficiency and thyroid issues: both are more common in women and both can thin the hair.
The Ludwig Scale
Just as men have the Norwood scale, women have the Ludwig scale to grade female pattern hair loss. It runs through three broad stages, from mild widening of the part to more noticeable thinning across the crown, while keeping the front hairline. Doctors use it to track progression and judge how well a treatment is working.
Frequently Asked Questions
Can women go completely bald like men?
It is rare. Female pattern loss usually thins the hair rather than clearing it, though conditions like alopecia areata or medical treatments can cause fuller loss.
Is female hair loss reversible?
Often it can be slowed or partly reversed, especially when a specific cause such as iron deficiency or thyroid imbalance is treated.
Does estrogen really protect hair?
It helps keep hair in the growth phase, which is part of why thinning often starts around menopause when estrogen falls.
Alopecia remedies
Being a genetic problem, there are no miracle cures to stop losing hair, whether you’re a man or a woman. However, it is possible to delay the process thanks to various treatments like massaging the scalp with natural hair oils such castor and oignon oil. The only lasting solution to alopecia is a hair transplant.
