Hair loss is a concern that affects millions of men and women worldwide. Many people believe that “high testosterone causes hair loss.” But is this actually true? What really happens in the scalp?
In this article, Dr. Apostolos Karalexis explains in a clear and accessible way the relationship between testosterone and hair loss.
What Is Testosterone?
Testosterone is the primary male hormone. It is produced mainly in the testicles in men and in much smaller amounts in the ovaries and adrenal glands in women. It belongs to the group of androgens and plays a key role in many bodily functions.
It contributes to:
- The growth and maintenance of muscle mass
- Sexual desire and normal reproductive function
- Energy levels and mood
- Hair growth on the body and face
- Bone density
- Proper fat distribution
Testosterone production increases during puberty and gradually declines after the age of 30.
And here’s where the biggest misconception comes in:
Many people believe that high testosterone causes hair loss. In reality, testosterone alone is not responsible for hair loss.
What truly matters is the conversion of testosterone into another hormone—DHT (dihydrotestosterone)—and the genetic sensitivity of hair follicles to it.
DHT: The Real Culprit
When testosterone is metabolized in the body, part of it is converted into a more potent hormone: dihydrotestosterone (DHT). DHT binds to receptors in the hair follicles and affects their function—but only in individuals with a genetic predisposition.
What does DHT do to hair?
- Causes follicle miniaturization
- Makes each new hair thinner and weaker
- Shortens the hair growth cycle
- Eventually stops hair production in affected areas
This progressive process is known as androgenetic alopecia, the most common type of hair loss in both men and women.
Why Doesn’t It Affect Everyone the Same Way?
Each person has a different sensitivity to DHT.
Two individuals may have the same testosterone levels, yet:
- One experiences hair loss because their follicles are sensitive to DHT
- The other maintains thick hair because their follicles are resistant
Why Do Some People Lose Hair and Others Don’t?
A very common question is: “Why am I losing hair while my friend isn’t?”
The answer lies in genetics.
The sensitivity of hair follicles to DHT is inherited. This means:
- Some people have follicles that react strongly to DHT
- Others are barely affected
Key examples:
- Two people with identical testosterone levels can have completely different hair density
- Someone with high testosterone may not lose any hair
- Another with lower testosterone may experience significant thinning
The difference lies in the DNA of the hair follicles.
Testosterone and Hair Loss in Women
Although testosterone is considered a “male” hormone, women also produce it in small amounts. When androgen levels increase—or when follicles are more sensitive to DHT—hair loss can occur.
In women, increased DHT may be caused by:
- Hormonal imbalances
- Polycystic Ovary Syndrome (PCOS), a common cause of thinning in younger women
- High stress levels affecting the hormonal axis
- Certain medications or changes in contraceptives
- Menopause and hormonal shifts
Unlike men, where hair loss typically appears at the temples and crown, in women it is usually:
- Diffuse
- More visible on the top of the scalp
- Characterized by reduced density and volume without complete bald patches
Beyond aesthetics, these changes can significantly impact confidence and emotional well-being.
Bodybuilding & Anabolic Steroids
Anabolic steroids (synthetic androgens) are sometimes used to accelerate muscle growth and improve performance. However, they directly affect hormone levels.
They artificially increase DHT levels, leading to:
- Faster muscle gain
- Accelerated hair loss in genetically predisposed individuals
- More aggressive androgenetic alopecia, often at a younger age
This is why many young men involved in bodybuilding experience sudden thinning, often without expecting it.
In addition to hair loss, steroid abuse may cause:
- Hormonal imbalances
- Fertility issues
- Acne and oily skin
- Mood swings
Important note for athletes
If there is a family history of hair loss, steroid use can trigger alopecia much earlier than expected.
What Can Be Done About DHT-Related Hair Loss?
Treatment depends on the stage of hair loss and the individual’s medical history. The earlier the intervention, the better the chances of preserving healthy follicles.
Available options include:
Topical treatments (Minoxidil)
- Improves blood flow to hair follicles
- Strengthens weak hairs
- Applied daily and safe for both men and women
Medications to reduce DHT
- Finasteride & Dutasteride (for men)
- Block the conversion of testosterone into DHT
- Significantly slow down hair thinning
- Often combined with topical treatments
For women, alternative hormonal therapies may be considered after medical evaluation.
Hair regeneration therapies
- Use platelet-rich plasma (PRP) from the patient’s own blood
- Stimulate follicle activity
- Improve hair quality and density
- Ideal for early to moderate stages
Hair transplantation
For advanced hair loss:
- Healthy follicles are transplanted from donor areas
- Provides permanent and natural-looking results
- Best solution for restoring density in bald areas
Personalized Approach for Optimal Results
There is no one-size-fits-all treatment.
The right approach is based on:
- Detailed scalp examination
- Medical history
- Hormonal evaluation
Dr. Karalexis creates a personalized treatment plan based on each patient’s needs, stage of alopecia, and expectations.
Conclusion
Testosterone alone does not cause hair loss. The real factor is DHT and the genetic sensitivity of hair follicles to it.
Early diagnosis and the right treatment approach can:
- Significantly slow down hair thinning
- Improve hair quality
- Enhance appearance and confidence