Hair loss is not one disease
Why is my hair falling out? Hair thinning causes, hair loss treatment: these are the phrases people type at two in the morning, holding a clump from the shower drain. The search returns thousands of results and almost none of them start with the only question that matters, which is: which kind of hair loss is this?
Because hair loss is not one disease. It is at least four, with different mechanisms, different timelines, and different treatments. They share a single end point in the mirror, which is why they get confused, and why treating before diagnosing is how people end up three months and several hundred ringgit later with exactly the same amount of hair. The first job, always, is finding out which loss is yours.
The four families, in plain language
Androgenetic alopecia is what most people mean when they say pattern baldness. It is driven by hormonal sensitivity in the follicle itself: over years, under the influence of dihydrotestosterone, the follicle miniaturises, producing finer and shorter hair until it stops producing anything at all. It runs in families, it is gradual, and it is the most common cause in both men and women, though the pattern differs between them. Men tend to lose at the temples and crown. Women tend to thin diffusely across the top, keeping the frontal hairline.
Telogen effluvium operates on a completely different mechanism. The hair cycle has a growth phase and a resting phase. A significant stressor, illness, childbirth, crash dieting, surgery, or a prolonged brutal stretch at work, can push a large proportion of hairs into the resting phase simultaneously. Two to three months later, they shed together. The timing confuses people: the loss feels sudden, but the cause happened months earlier. The good news is that this form is usually self-limiting once the trigger resolves. The difficulty is recognising that it is sometimes layered over pattern loss that was already present, which changes the picture significantly.
Deficiency and hormonal causes are worth separating out because they are frequently missed. Low iron, specifically low ferritin even when haemoglobin looks normal, is one of the most common and correctable causes of diffuse thinning in women. Thyroid dysfunction, both hypothyroid and hyperthyroid, can cause hair to thin across the whole scalp. Vitamin D deficiency appears in the picture often enough to be worth checking. These causes are invisible on the scalp and indistinguishable from pattern loss by eye, which is why blood work is not optional when the history suggests them.
Scarring alopecia is the fourth family, and it is the one that changes the urgency. In these conditions, inflammation damages the follicle itself, and the follicle is replaced by scar tissue. Once scarred, it does not regenerate. Patchy loss, redness, scaling, itching, or pain on the scalp are the red flags. This category needs a dermatologist promptly. An aesthetic clinic is not the right place for it, and saying so plainly is part of good care.
Why they get confused, and why two at once is common
The categories overlap, and two causes running simultaneously is genuinely common. A woman in her late thirties may have mild pattern loss that has been quietly progressing for years. A stressful pregnancy and the months after it layer telogen effluvium on top. Low ferritin, common postpartum, adds a third thread. She presents with what feels like sudden, catastrophic shedding. The correct treatment addresses all three threads, not just the most visible one.
Different speeds compound the confusion. Pattern loss is measured in years. Telogen effluvium peaks at months. Deficiency-related thinning may reverse in weeks once corrected. A patient who treats aggressively for pattern loss and is actually in a resolving shedding phase may attribute the recovery to the treatment rather than to time. A patient who waits for shedding to resolve on its own, when what they have is pattern loss, has lost ground they will not recover.
How the causes are pulled apart
History is the starting point. When did it begin, how fast is it moving, is it diffuse or localised, has anything significant happened in the preceding months, does anyone in the family have the same pattern. These questions narrow the differential before anyone has looked at the scalp.
Scalp examination comes next. The distribution of thinning, the calibre of individual hairs, whether miniaturisation is visible at the hairline, whether there is any redness or scarring, these are the things a consultation is actually looking at. A dermoscopy device, essentially a magnified scalp camera, makes this more precise.
Blood work follows when the history calls for it: ferritin, thyroid function, vitamin D, and sometimes hormonal panels. This is not routine box-ticking. It is the step that finds the correctable causes before someone spends months treating the wrong thing.
This sequence, history, scalp examination, targeted blood work, is the actual treatment decision. Everything that follows is execution. What a consultation looks like in practice covers the structure of this kind of assessment.
What treatment looks like once the cause is named
For pattern loss, the first-line medical options are well established. Topical minoxidil widens the blood vessels around the follicle and extends the growth phase; it is available without prescription but works better as part of a monitored plan. Oral finasteride is effective in men where the clinical picture supports it, prescribed only after a proper evaluation, and is not used in women who are or may become pregnant. These are not quick fixes. They are maintenance treatments, which means starting earlier protects more.
Scalp injections, including platelet-rich plasma drawn from the patient's own blood, can support follicles that have thinned but are still active. The evidence for PRP in pattern loss is reasonably consistent as an adjunct to other treatment rather than a stand-alone intervention. The key word is active: injecting a follicle that has already fully miniaturised achieves nothing. The Retreat Clinic's hair loss approach lays out what this looks like in practice.
Where deficiencies are driving or contributing to the loss, correcting them is the priority. Iron supplementation where ferritin is low, thyroid management where function is off. In some cases, this is the whole treatment.
Transplant surgery is for hair loss that has progressed beyond what medical management can protect. This is surgery, with a surgeon, and we refer patients who need it rather than pretending otherwise.
The honest ceilings
Some things are worth saying plainly. A smooth, long-bald scalp is not injection territory. No honest clinic sells treatment sessions against a follicle that has been gone for years. Telogen effluvium that is actively resolving mostly needs time, an explanation, and the reassurance that it is not pattern loss. Sometimes that explanation is the whole consultation, and that is a good outcome.
Hair is unusual in aesthetic medicine in one specific way. Most concerns are forgiving of delay. Pigmentation, skin texture, early laxity, these wait while you decide. Miniaturising follicles do not. The strongest card in hair medicine is protecting what is still active, and the window for doing that is not infinite. The question is never what treats hair loss. It is which hair loss is this, and how much time is left to act on it.
If you are noticing thinning, the useful move is an assessment, not a shelf of products. Understanding hair thinning is the place to start.
