What Is DHT and Hair Loss? Causes, Signs and Treatment

DHT (dihydrotestosterone) is a hormone made from testosterone that shrinks hair follicles on the scalp, causing male and female pattern hair loss over time. It is the single biggest driver of androgenetic alopecia, the inherited thinning that affects a large share of men and women.

How Does DHT Cause Hair Loss?

DHT is produced when the enzyme 5-alpha-reductase converts testosterone. In people genetically predisposed to pattern baldness, hair follicles on the top and front of the scalp are sensitive to DHT. The hormone binds to those follicles and slowly chokes off their growth cycle. Follicles on the sides and back of the scalp are usually resistant, which is why donor hair for transplants survives.

• Step 1: Testosterone is converted into DHT by the enzyme 5-alpha-reductase.
• Step 2: DHT binds to androgen receptors in genetically sensitive scalp follicles.
• Step 3: The growth (anagen) phase shortens and the resting phase lengthens.
• Step 4: Each new hair grows back thinner, shorter and lighter in colour.
• Step 5: Eventually the follicle stops producing visible hair and scars over.

Who Is Affected by DHT-Related Hair Loss?

DHT-related hair loss is primarily a genetic condition, so your risk depends on family history rather than lifestyle. Men typically notice a receding hairline or thinning crown in their 20s to 40s. Women usually see diffuse thinning along the part line, often around menopause when oestrogen drops and DHT has more relative influence.

• Men with a father, grandfather or uncle who went bald early.
• Women with a family history of thinning, especially after menopause.
• People with polycystic ovary syndrome (PCOS), which can raise androgen levels.
• Anyone taking testosterone or anabolic steroids, which increase DHT conversion.
• Men of African, Caucasian and Asian descent can all be affected, though patterns differ.

What Are the Signs of DHT-Related Hair Loss?

The signs follow a predictable pattern because DHT targets specific zones of the scalp. The key difference from stress or nutritional shedding is that DHT loss is gradual, localised and permanent without treatment.

• A receding hairline that forms an M, V or U shape.
• Thinning at the crown or vertex that slowly expands.
• A widening part line in women, often with a Christmas-tree pattern.
• Hair that feels finer and softer in thinning areas than at the back.
• Increased shedding on pillows and in the shower, though not clumps.
• A visible scalp under bright light before baldness is obvious.

How Is DHT-Related Hair Loss Treated?

Treatment falls into two camps: blocking DHT to slow or stop loss, and replacing lost hair surgically. Most specialists recommend combining both, because medication protects existing hair while a transplant restores what is already gone.

Can Hair Transplant Help with DHT-Related Hair Loss?

Yes. A hair transplant works precisely because donor follicles from the back and sides of the scalp are genetically resistant to DHT. When surgeons move those follicles to the hairline or crown, they keep that resistance and continue growing for life. The catch is that your native hair in the transplant zone can keep thinning, so most surgeons recommend staying on a DHT blocker after surgery to protect the result.

When Should You See a Specialist?

See a dermatologist or hair restoration surgeon as soon as you notice a change in your hairline, part line or crown density. DHT damage is progressive, and the earlier you start treatment the more native hair you keep. A specialist can confirm the diagnosis with a scalp exam, trichoscopy and sometimes blood tests to rule out thyroid, iron or autoimmune causes.

• You have visible thinning at the crown, hairline or part line.
• You are losing more hair than usual for several weeks.
• Your scalp itches, burns or flakes alongside the shedding.
• You have a family history of early baldness and want to get ahead of it.
• You are considering a transplant and want to know if you are a candidate.

Frequently Asked Questions