What Is DHT, and Why Is It Causing Your Hair Loss?

If you have started researching hair loss, you will have run into three letters very quickly: DHT. It gets blamed for everything. Receding hairlines, thinning crowns, that widening parting you have started noticing under bathroom lighting. But most articles either bury it in jargon or skip straight to selling you something.

So let us do this properly. Here is what DHT actually is, what it is doing to your follicles, and why understanding it changes how you approach hair loss.

What is DHT?

DHT stands for dihydrotestosterone. It is an androgen, a hormone your body makes naturally, and both men and women have it. DHT is not created directly. It is converted from testosterone by an enzyme called 5-alpha-reductase. Testosterone goes in, DHT comes out, and DHT is considerably more potent than the testosterone it came from. Crucially, DHT is not a villain. It has legitimate jobs in the body and always has. The problem is not that you have DHT. The problem is what it does to certain hair follicles in certain people.

So why does it cause hair loss?

Here is the part most people miss, DHT does not attack your whole head. If it did, everyone with hair loss would go uniformly bald all over, which is obviously not what happens. Instead, hair loss follows a predictable pattern: the temples, the hairline, the crown. Meanwhile the hair at the back and sides carries on quite happily.

The reason is that follicles are not all the same. Some follicles carry androgen receptors that are highly sensitive to DHT, and those are concentrated in exactly the areas where pattern hair loss shows up. The follicles at the back and sides are far less sensitive, which is precisely why they are the ones used in hair transplants.

When DHT binds to a sensitive follicle, it triggers a process called miniaturisation. The follicle does not die outright. It shrinks. Each growth cycle it produces a slightly finer, shorter, weaker hair than the one before, and the growing phase gets shorter each time.

So the hair does not fall out and vanish overnight. It gradually downgrades. Thick terminal hair becomes finer. Finer hair becomes wispy. Eventually the follicle produces something so fine it is barely visible, and then it may stop producing altogether.

This is why hair loss feels like it creeps up on you. It is not sudden. It is a slow, cumulative downgrade that you only really register once a lot of ground has already been lost.

Why some people and not others?

Largely genetics. Two things vary from person to person: how much 5-alpha-reductase activity you have, and how sensitive your follicular androgen receptors are. Both are substantially inherited.

This is the condition called androgenetic alopecia, which is the medical name for what most people call male pattern baldness or female pattern hair loss. It is by far the most common cause of hair loss, and it affects both men and women. And no, it does not only come from your mother's side. That is a persistent myth. The genetics are more complicated and involve contributions from both parents.

What about women?

This is worth its own section, because women are frequently told their hair loss is "just stress" when it is nothing of the sort. Women have DHT too, and their follicles can be just as sensitive to it. Female pattern hair loss tends to present differently from the male version, showing up as diffuse thinning across the top of the scalp and a widening central parting rather than a receding hairline. It also often becomes noticeable around perimenopause and menopause. As oestrogen levels fall, the balance of hormones shifts, and follicles that were previously protected can become more vulnerable to the androgens that were always present.

If you are a woman noticing more scalp than you used to, or finding your parting is getting wider, this is a real, recognised, well understood condition. It deserves a proper assessment rather than reassurance.

The point everyone misses: timing matters enormously, because DHT causes miniaturisation rather than instant death, there is a window. A miniaturised follicle is a damaged follicle, but it is still a living one. A follicle that has been fully dormant for years is a much harder proposition. The earlier hair loss is assessed and addressed, the more follicles are still in that recoverable middle ground.

This is the single most important thing to understand about pattern hair loss, and it is why "I'll leave it and see what happens" is usually the most expensive decision people make. Not because anything dramatic happens quickly, but because the window quietly narrows while you are waiting.

If you have noticed your hairline moving, your crown thinning, or your parting widening, that is the point to get it looked at. Not in two years.

What does an assessment actually involve?

A proper hair loss consultation is not somebody glancing at your head and recommending a treatment.

It should involve looking at the pattern and distribution of your loss, taking a history including when it started and how quickly it has progressed, discussing family history, and considering whether anything else might be contributing. Thyroid issues, iron deficiency, certain medications and significant stress can all cause or worsen shedding, and they are managed very differently from androgenetic alopecia.

Getting the diagnosis right is not a formality. Treating pattern hair loss when the actual problem is a thyroid imbalance will not work, and will waste both your time and your money.

Only once there is a clear picture of what is happening, and why, does it make sense to discuss what can be done about it. There is a range of approaches available, some regenerative, some medical, and some suited to combining. Which of them is appropriate, if any, depends entirely on the individual, and that is a conversation to have with a medical practitioner who has assessed you properly.

Where to start

At Cheshire MediGlow in Altrincham, we are a medically led clinic and hair loss is one of our core specialisms. Our consultations start with understanding what is actually happening to your hair, and we will always be straight with you about what is realistic. If you would like your hair loss properly assessed, you can book a hair loss consultation with us. We will talk you through what we find and what your options are, including being honest with you if we do not think we are the right answer.

To book a consultation or for more information about our DHT blocker treatment, get in touch.