Androgenetic Alopecia

What is androgenetic alopecia?

Androgenetic alopecia (AGA), often called hereditary hair loss or pattern hair loss, is a common form of hair loss in men and women. In men, estimates suggest that more than half of men over age 50 have some degree of hair loss. ^[1]

Hair loss usually has several causes, and some of them are outside personal control. For a broader overview, read Hair Loss Causes. Genetics and hormones both play a role. Dihydrotestosterone (DHT), a metabolite of testosterone, is medically important in male androgenetic alopecia. The condition usually develops gradually and can progress over time.

Symptoms

In men, the hallmark of androgenetic alopecia is a predictable pattern of thinning. Typical signs include a receding hairline that often forms an M shape, thinning at the crown and, over time, partial or complete baldness in these areas.

It is normal to shed about 50 to 100 hairs per day as part of the natural hair cycle. This normal shedding does not cause a receding hairline or other noticeable hair loss patterns.

In androgenetic alopecia, hairs become shorter, finer and lighter over time. Through follicle miniaturization, strong hairs gradually turn into barely visible vellus hairs. In some men this can progress to complete baldness; in others it appears only as thinning at the crown.

In women, the pattern often differs. Instead of a clearly receding hairline, thinning is more commonly diffuse across the crown while the frontal hairline is preserved. ^[1]

Causes

Hair loss can have many causes, but in androgenetic alopecia the causes are fairly specific: a genetic predisposition combined with the action of androgens, especially DHT.

Your body forms DHT as a byproduct of testosterone. DHT is important; it is needed for the development of male characteristics such as beard growth and the prostate. With increasing age, however, the body's relationship to DHT changes, and the hormone plays a central role in androgenetic alopecia.

DHT can contribute to miniaturization of sensitive hair follicles. Affected follicles become thinner and shorter, which can reduce visible hair density. Medical literature also discusses changes in the hair cycle and local inflammatory processes. ^[2]

Men with hair loss tend to have higher DHT levels than peers of the same age and more androgen receptors in the scalp. The key point is that blood testosterone level is usually not decisive. What matters is how sensitive the hair follicles are to DHT, and that is genetically determined.

Risk Factors

Hair growth changes with age in everyone. In androgenetic alopecia, several factors can increase the risk.

Family history is one of the strongest clues. If close relatives are affected, individual risk can be higher. Age also matters: probability increases over time, although first signs can appear in the late teenage years or early twenties. ^[1]

Frequent washing, hats, sexual activity and normal styling do not meaningfully cause androgenetic alopecia. Chronic traction from tight hairstyles can cause a different form of hair loss.

Diagnosis

If you notice changes in hair growth, it makes sense to see a dermatologist or another physician you trust.

Androgenetic alopecia is typically diagnosed as follows: the physician looks at the pattern and distribution of hair loss, when it started and whether possible triggers can be identified. Some dermatologists use the Norwood scale to classify extent. ^[2]

Questions about family history help the physician assess whether a genetic predisposition is likely. With a dermatoscope, the physician can look more closely at follicle health and detect miniaturization. In a pull test, 20 to 60 hairs are gently pulled; if more than 10% come loose, this can suggest increased shedding.

To rule out other causes, blood tests can be useful when the pattern is atypical, for example to check thyroid function, iron levels or autoimmune markers.

You do not always need a complex formal diagnosis to start treatment. If the pattern is clear, extensive testing is often not necessary. Medical assessment can still help rule out other causes.

Treatment

Can androgenetic alopecia be reversed? Not necessarily. Treatment can influence the course in some people.

Results vary, but most treatments aim to slow or stop progression and preserve existing hair.

Minoxidil is a well-studied topical ingredient in androgenetic alopecia. Its exact mechanism is not fully understood; clinical studies show that topical minoxidil can improve density or stabilization in some users. ^[4] Read more about minoxidil application.

Finasteride is prescription-only and belongs to the 5-alpha-reductase inhibitor class. It lowers DHT formation and has been studied in randomized trials in male androgenetic alopecia. ^[3] Whether finasteride is suitable is a physician decision. Learn more in Finasteride: Efficacy & Studies.

A physician may also assess whether a combination of approaches is appropriate. The relevant factors include hair loss pattern, medical history, possible side effects and personal preferences.

Other options include low-level laser therapy (LLLT), PRP (platelet-rich plasma) or hair transplantation. Evidence, availability and suitability differ substantially by method. A systematic review found positive study signals for several non-surgical options, while also noting differences in evidence quality. ^[5]

Gentle hair care also matters. Aggressive brushing, tight hairstyles or harsh products can worsen shedding, regardless of the underlying cause.

Prevention

Genetic predisposition cannot be changed, but early medical input can help clarify what is happening. If you notice changes in your hairline, crown or shedding pattern, it is reasonable to seek medical advice.

Treat hair loss online in Switzerland: with orva, you start with a medical questionnaire. Licensed Swiss physicians review your information. If medically appropriate, the physician may issue a prescription.

Depending on the findings, the physician can discuss options to stabilize the course or improve hair density. Gentle hair care habits remain important too.

To support general health, good stress management and a balanced diet can help. Check your hairline and crown regularly; photos taken at regular intervals can make changes easier to notice early.