What Really Causes Male Pattern Baldness? Genetics, Hormones & More

In short: male pattern baldness is driven primarily by an inherited sensitivity of the androgen receptor gene to DHT, a hormone derived from testosterone — not stress, diet, or sleep. Those factors are more clearly linked to a different, usually temporary condition (telogen effluvium). The DHT/androgen-receptor pathway is exactly what medical treatment is designed to act on.

Think your dad's baldness is your destiny? You're not totally wrong — but there's more to the story. Let's unpack what's actually behind male pattern baldness.

What role does genetics play in male pattern baldness?

The androgen receptor (AR) gene plays a central role. Large genetic studies have identified variation in this gene as the major determinant of common early-onset androgenetic alopecia — if you inherit a more sensitive version, your hair follicles respond more strongly to DHT (PubMed 15902657). Baldness is polygenic, though: the AR gene is the largest single known contributor, not the only one, which is part of why the pattern and pace of loss vary even between close relatives.

What role does DHT play, and why does hair loss progress with age?

DHT is a hormone derived from testosterone. In follicles with a sensitive androgen receptor, DHT binding triggers progressive miniaturization: each growth cycle produces a finer, shorter hair than the last, until the follicle stops producing a visible hair at all. This is the mechanism that oral and topical medical treatments are designed to act on. As men age, the follicles carrying the sensitive genetic pattern become progressively more affected by DHT, and the growth phase of the hair cycle shortens — which is why androgenetic alopecia typically advances gradually rather than appearing all at once.

Do stress, diet, or poor sleep cause hair loss?

Not androgenetic alopecia specifically — the evidence for that is weaker than it's usually presented. What those factors are more clearly linked to is telogen effluvium — a separate, usually temporary condition where an unusually large share of follicles shift into the resting phase at once, often triggered by illness, sharp weight loss, major stress, certain medications, or nutritional and thyroid issues. In a series of over 3,000 telogen effluvium patients, iron deficiency and thyroid dysfunction were identifiable contributors in a meaningful minority of cases (PubMed 34449961).

The practical point: androgenetic alopecia and telogen effluvium can look similar day to day but call for different next steps. If your shedding is diffuse across the whole scalp, came on suddenly, or followed an illness or major life stressor, that pattern is worth raising with a clinician specifically — it may not be the genetic, DHT-driven process described above at all. For the supplement question specifically, see hair loss supplements.

Factor	Role in androgenetic alopecia
Androgen receptor (AR) gene	Largest single known genetic contributor; determines follicle sensitivity to DHT
DHT	Triggers progressive follicle miniaturisation in genetically sensitive follicles
Age	DHT's effect accumulates over time, so loss typically advances gradually
Stress, diet, poor sleep	Not established causes of androgenetic alopecia — more clearly linked to telogen effluvium, a separate condition

Can anything actually be done about DHT-driven hair loss?

You can't change your genes, but the DHT/androgen-receptor pathway itself is what oral and topical medical treatments are designed to act on — and it's a large part of why a hair transplant on its own doesn't stop the underlying process. Whether treatment is appropriate for you, and which form, is a question for a physician after assessment, not a product to self-select. If you're wondering whether now is the time to have that assessment, see our article on when to start treating hair loss, and for how a prescription works in Israel, how a prescription is obtained.

Frequently asked questions

Is male pattern baldness only inherited from my mother's side?

No, and that's a common oversimplification. The androgen receptor gene sits on the X chromosome, which sons inherit from their mother — which is where the "check your maternal grandfather" idea comes from — but the overall genetic picture is polygenic, involving genes from both parents (PubMed 15902657).

Can telogen effluvium and androgenetic alopecia happen at the same time?

Yes, and that overlap is part of why an assessment matters rather than assuming one or the other. A sudden, diffuse shedding episode layered on top of a slower, pattern-based thinning can have two separate causes running in parallel.

Does DHT cause hair loss everywhere on the scalp equally?

No. Follicles at the back and sides of the scalp are typically much less sensitive to DHT, which is why they usually remain unaffected even in advanced cases — and why they're the donor area used in hair transplant surgery.

If I stop the DHT-driven process, will lost hair come back on its own?

Medical treatment targets ongoing miniaturisation, not follicles that have already stopped producing visible hair entirely — see our breakdown of treatment options for what each approach can and can't do.

Medical disclaimer: this article is general information and is not medical advice, a diagnosis, or a treatment recommendation. Prescription medicines in Israel require assessment by a licensed physician, who will determine whether treatment is appropriate for you. Do not start, change or stop any treatment on the basis of this article.

Sources: PubMed 15902657 · PubMed 34449961