Hair loss: which pattern is yours, what regrows, and what treatment works
Last updated September 3, 2026.
Losing 50 to 100 hairs a day is normal; what matters is the pattern, because the pattern is the diagnosis. A receding hairline, diffuse shedding after a stress, and smooth bald patches are three different conditions with three different treatments. The good news: the most common types are well understood, two proven medications exist, and the stress-shedding type usually regrows on its own.
Which pattern is yours?
Pattern hair loss (androgenetic) is the most common: men get a receding hairline and thinning crown; women get diffuse thinning over the top with a widening parting, usually with the frontal hairline kept. Telogen effluvium is diffuse shedding all over, arriving two to three months after a trigger: a high fever, COVID, surgery, crash dieting, childbirth, or a major stress, and it typically regrows over 6 to 9 months once the trigger passes. Alopecia areata is smooth, completely bald, round patches that appear suddenly, an autoimmune attack on the follicles. Scaly patches with broken hairs and itch, especially in children, suggest a fungal infection (tinea capitis). Tight braids and pulled-back styles cause traction loss at the margins. Thyroid problems, iron deficiency, and rapid weight loss feed diffuse thinning.
What actually helps?
- Minoxidil, the over-the-counter mainstay: applied to the scalp once or twice daily, it thickens miniaturized hairs and slows loss in both men and women with pattern hair loss. Judge it at 3 to 6 months, expect a brief shed in the first weeks (a sign it is shifting hairs into growth), and know the rule: it works only while you keep using it.
- Finasteride for men: a daily prescription tablet that blocks the hormone byproduct shrinking the follicles. It halts loss in most men and regrows some hair in many, works only while taken, and carries a small risk of sexual side effects that usually reverse on stopping. Women who could become pregnant must not take or handle crushed tablets.
- Treat the trigger, not the mirror: telogen effluvium needs no product: it regrows once the trigger is past and nutrition is adequate. Diffuse loss with fatigue, cold intolerance, or heavy periods earns blood tests for thyroid and iron.
- Handle hair gently: loosen tight styles, ease off heat and chemical processing, and use a wide-tooth comb. These protect what you have while treatments work.
- Dermatologist territory: alopecia areata, any scarring or painful patches, eyebrow or body hair loss, and anything in a child. Early treatment changes outcomes in those, and scalp injections for areata work best when started promptly.
When is it an emergency?
Hair loss is never an emergency, but two patterns should not wait months for an appointment: scarring alopecias (smooth, shiny, sometimes painful or burning patches where follicles are being destroyed permanently, because early treatment saves the remaining hair) and scaly, inflamed patches in a child, which need prescription antifungals that creams cannot replace. Hair loss with other symptoms (fatigue, weight change, feeling cold, irregular periods) is a blood-test conversation, not a shampoo conversation. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
How much hair loss is normal?
Roughly 50 to 100 hairs a day, which is unnoticeable in a head of 100,000. It becomes a problem when shedding visibly outpaces regrowth: clumps in the shower drain, a thinning ponytail, more scalp showing, or a receding hairline. A rough home check: the pull test, gently tugging a small bunch of hairs, should yield only a couple of hairs; several coming away easily suggests active shedding worth investigating.
Why is my hair falling out?
Work the pattern. Receding hairline and crown (men) or a widening parting (women): androgenetic, the inherited hormone-sensitive kind. Diffuse shedding starting 2 to 3 months after illness, surgery, childbirth, crash diet, or major stress: telogen effluvium, and it regrows. Smooth, completely bald round patches: alopecia areata, autoimmune. Scaly itchy patches with broken hairs: fungal, especially in children. Loss at the hairline with tight styling: traction. Diffuse loss with fatigue or feeling cold: check thyroid and iron.
Does minoxidil actually work?
Yes, with caveats that matter. For pattern hair loss it thickens miniaturized hairs and slows loss in the majority of consistent users, men and women, but the timeline is months: expect an initial shed in the first weeks (old hairs making way for new growth), first visible results around 3 to 6 months, and peak effect around a year. The catch is permanence: gains are maintained only while you keep applying it, and stopping means losing the regrown hair within months. It does not resurrect follicles that have been smooth-bald for years.
Will my hair grow back after stress or illness?
In telogen effluvium, the stress- or illness-triggered shedding, almost always yes. The trigger pushed a wave of follicles into their resting phase, and they shed a few months later; once the trigger passes, the follicles re-enter growth and density returns over roughly 6 to 9 months. No product speeds this meaningfully; adequate protein, iron, and patience do the work. If shedding is still heavy past 6 months, or density is not recovering, that is when blood tests and a dermatology review earn their place.
Do biotin and hair supplements work?
Only if you are actually deficient, which is uncommon in people eating a normal diet. Biotin deficiency is rare, and trials do not show hair benefits for supplementing people who are not deficient; high-dose biotin also distorts several lab tests (including thyroid and heart markers), which can cause real diagnostic chaos. The supplements with a genuine rationale are iron when ferritin is low and vitamin D when deficient. Everything else in the hair-vitamin aisle is marketing over evidence.
When should I see a doctor about hair loss?
Promptly for: smooth bald patches (alopecia areata responds best to early treatment), any patch that is scaly, inflamed, painful, or looks scarred and shiny, hair loss in a child, or loss of eyebrows, lashes, or body hair. Book a routine visit for diffuse shedding lasting beyond 6 months, thinning with symptoms like fatigue or feeling cold (thyroid and iron checks), and for pattern loss you want to treat, because earlier starts keep more hair. Bring photos; the timeline matters.