Hair Loss: causes, diagnosis, treatment

The two patterns that explain most cases

Almost everyone who comes in worried about hair loss falls into one of two very different categories, and telling them apart is the first job. Androgenetic alopecia (pattern hair loss) is genetic and hormone-driven: hair follicles gradually shrink in response to DHT, producing a predictable pattern — receding hairline and crown thinning in men, diffuse thinning over the crown with a preserved frontal line in women. It is slow, progressive, and does not reverse on its own. Telogen effluvium is different — a stress response that pushes large numbers of hairs into the shedding phase at once, usually 2–4 months after a trigger such as illness, surgery, childbirth, crash dieting, or severe emotional stress. It looks alarming (handfuls of hair in the shower) but is diffuse rather than patterned, and it almost always recovers once the trigger resolves. Other causes — thyroid dysfunction, iron deficiency, fungal scalp infection, alopecia areata (patchy autoimmune loss) — are less common but worth ruling out, especially when the pattern doesn't fit the two categories above.

Evidence-based treatment options

For pattern hair loss, two medical treatments have the strongest track record. Topical minoxidil (2% or 5%) increases blood flow to follicles and extends the growth phase; it works for both men and women, needs twice-daily application, and takes 3–6 months of consistent use before results become visible — stopping treatment reverses the gains. Oral finasteride (for men) blocks the conversion of testosterone to DHT at the follicle and is more effective than minoxidil alone at slowing and partially reversing male pattern loss, though it requires a prescription and a conversation about the small possibility of sexual side effects, which typically resolve on stopping. Combining both treatments generally outperforms either alone. PRP (platelet-rich plasma) injections show promising but more variable evidence and work best as an add-on rather than a stand-alone treatment. For telogen effluvium, treatment is simply identifying and correcting the trigger — checking ferritin and thyroid levels, addressing nutritional gaps, and being patient, since regrowth takes several months to become visible.

When to consider a hair transplant

A transplant makes sense only after loss has been medically stabilised — operating on an still-progressing hairline means the surgical result gets undermined by continued loss around it. Good candidates typically have stable Norwood/Ludwig staging for at least 12 months on medical therapy, adequate donor hair at the back and sides (which is genetically resistant to DHT and used to repopulate thinning areas), and realistic expectations about density — a transplant redistributes existing hair, it doesn't create new follicles. See the dedicated hair transplant guide for what the procedure itself involves.

Red flags that need in-person evaluation

Most hair loss is not an emergency, but a few presentations deserve prompt in-person assessment rather than a wait-and-see approach: sudden patchy bald spots with a smooth scalp (possible alopecia areata), scalp pain, itching, redness or scaling accompanying the loss (possible scarring alopecia or fungal infection, where delay can mean permanent follicle loss), hair loss accompanied by other symptoms like unexplained fatigue, weight change or irregular periods (possible thyroid or hormonal cause), or rapidly progressive loss in a young patient. None of these are things to self-diagnose from a search result — they are exactly what an in-person or AI pre-consultation assessment is for.

Frequently asked questions

This page is educational information, not a diagnosis or treatment plan. AI tools on TransformYou are informational only; every clinical recommendation is reviewed by Dr. Shishir Anand in compliance with India's Telemedicine Practice Guidelines 2020. For emergencies, call 112 or visit the nearest hospital.