The most common form of hair loss is androgenetic alopecia — pattern hair loss driven by a combination of genetics and the hormone dihydrotestosterone, or DHT. In men, it typically presents as a receding hairline or thinning at the crown, often following a recognisable pattern described by the Norwood scale. In women, thinning is usually more diffuse and spread across the top of the scalp, making it harder to spot early but just as distressing when it progresses.
Roughly half of all men will experience noticeable hair loss by the age of fifty, and the figure for women is higher than many expect — up to forty per cent will deal with visible thinning at some point in their lives. Despite those numbers, hair loss remains something many people feel uncomfortable talking about, which often means people wait far longer than they need to before seeking advice.
The earlier you have your hair assessed, the more options you have. In some cases, non-surgical treatments such as PRP therapy or medical management can slow progression and preserve what you have. In others, a hair transplant can restore areas that have already thinned or receded. The right approach depends on your specific situation — your age, the pattern of your loss, your donor supply and your goals.
That assessment starts with understanding what type of hair loss you are dealing with. Not all hair loss is permanent, and not all of it responds to the same treatment. Conditions such as telogen effluvium, alopecia areata and traction alopecia each behave differently and require different approaches. A thorough evaluation by an AHPRA-registered doctor is the only way to know what you are working with and what is genuinely worth pursuing.
How DHT causes permanent hair loss
DHT is a byproduct of testosterone, produced by an enzyme called 5-alpha reductase. In people genetically predisposed to pattern hair loss, DHT binds to receptors in hair follicles and gradually shrinks them — a process called miniaturisation. Over successive growth cycles, affected follicles produce thinner, shorter, lighter hairs until they eventually stop producing visible hair altogether. The follicles on the back and sides of the scalp are genetically resistant to DHT, which is why they serve as the donor area for transplantation and why transplanted hair continues to grow in its new location.
Understanding this mechanism is important because it shapes the treatment approach. Medications such as finasteride work by blocking the enzyme that converts testosterone to DHT, which can slow or halt further miniaturisation. Minoxidil works differently, by extending the growth phase of the hair cycle and improving blood flow to the follicle. Neither reverses significant hair loss on its own, but both can be valuable tools — either as standalone treatments for early-stage thinning or as part of a broader plan that includes transplantation.
When to seek advice
The single biggest mistake people make with hair loss is waiting too long. By the time thinning is obvious to others, it has usually been progressing for years. A receding hairline or a widening part is rarely something that stabilises on its own — in most cases, it continues. The sooner you have a professional assessment, the more tools are available to you and the better the potential outcome, whether that involves medication, a procedure, or both.
If you have noticed more hair on your pillow, in the shower drain, or when you run your hands through your hair, or if your hairline or part looks different to how it did a year or two ago, that is reason enough to have a conversation with a doctor who understands hair loss. It does not commit you to anything — it simply gives you information to make decisions with.
Read our complete hair loss guide