Hair loss, evaluated
properly
Most hair loss is treatable, and the treatments work far better when started early. The critical step is identifying which kind you have — because the answer determines whether the goal is regrowth, maintenance, or preserving what remains before it is lost permanently.
The distinction that determines everything
The first question in any hair loss evaluation is whether the follicles are still alive.
Non-scarring alopecias leave the follicle intact. The hair has miniaturized or shed, but the machinery is still there and can be reactivated. This category includes pattern hair loss, telogen effluvium, and alopecia areata, and it accounts for the overwhelming majority of cases.
Scarring alopecias destroy the follicle and replace it with fibrous tissue. Once that has happened, no treatment brings the hair back. The entire therapeutic goal is halting progression to protect the follicles that remain. These are far less common, but they are the reason unexplained hair loss should not be watched indefinitely.
Scarring alopecias often present with subtle symptoms — scalp burning, itching, tenderness, or a smooth shiny patch where follicular openings have disappeared. These can be dismissed for years. Treatment cannot recover destroyed follicles, so the window for intervention is genuinely limited.
The common causes
Androgenetic alopecia (pattern hair loss)
By far the most common cause in both men and women. Follicles that are genetically sensitive to dihydrotestosterone progressively miniaturize, producing finer, shorter, lighter hairs with each cycle until they stop producing visible hair at all.
In men it typically follows the familiar pattern of temporal recession and vertex thinning. In women it more often presents as diffuse widening of the central part with preservation of the frontal hairline. It is progressive without treatment, which is why intervening early preserves more.
Telogen effluvium
A synchronized shedding event in which a large proportion of follicles shift prematurely into the resting phase and release together. The hallmark is diffuse shedding — hair coming out in the shower and on the pillow — beginning roughly two to three months after a triggering event.
Common triggers include major illness, surgery, childbirth, rapid weight loss, iron deficiency, thyroid dysfunction, starting or stopping certain medications, and significant psychological stress. It is almost always fully reversible once the underlying trigger resolves, though the recovery lags the trigger by several months.
Alopecia areata
An autoimmune condition in which the immune system attacks the hair follicle, producing well-demarcated round patches of complete hair loss. It can affect the scalp, beard, eyebrows, or body hair, and in some cases progresses to total scalp or body involvement. The follicles survive, so regrowth is possible, and the treatment landscape has changed substantially with the arrival of oral JAK inhibitors for severe disease.
Traction alopecia
Caused by sustained tension from tight braids, weaves, extensions, or repeated tight ponytails. It is fully reversible early, but becomes scarring and permanent if the tension continues over years. It disproportionately affects Black women and is frequently under-addressed.
Scarring alopecias
Frontal fibrosing alopecia, lichen planopilaris, and central centrifugal cicatricial alopecia are the most frequently encountered. They cause permanent follicular destruction and warrant prompt diagnosis, usually including a scalp biopsy.
Treatment options
Minoxidil
Prolongs the growth phase of the hair cycle and improves follicular blood supply. Available topically over the counter and increasingly prescribed at low oral doses, which many patients find more tolerable and easier to use consistently than the topical solution. Oral minoxidil requires review of cardiovascular history and blood pressure.
Expect a temporary increase in shedding in the first six to eight weeks. This reflects follicles synchronizing into a new cycle and is not a sign the treatment is failing.
5-alpha-reductase inhibitors
Finasteride and dutasteride reduce conversion of testosterone to dihydrotestosterone, addressing the driver of pattern hair loss directly. Finasteride is the most extensively studied treatment for male pattern hair loss. A minority of users report sexual side effects, which warrant discussion before starting. Both are contraindicated in pregnancy and require specific counseling for anyone who could become pregnant.
Anti-androgens for female pattern hair loss
Spironolactone is commonly used and blocks androgen receptors. Combined oral contraceptives can also help. Choice depends on your broader medical history and reproductive plans.
Treating the underlying cause
For telogen effluvium, laboratory evaluation frequently identifies something correctable — iron deficiency, thyroid dysfunction, or vitamin D deficiency being the most common. Correcting a documented deficiency is far more effective than empiric supplementation, and it is worth noting that high-dose biotin can interfere with thyroid and cardiac laboratory assays.
Immunomodulatory therapy
Alopecia areata may be treated with intralesional corticosteroid injections for limited patches, topical immunotherapy, or oral JAK inhibitors for extensive disease. Scarring alopecias require anti-inflammatory treatment aimed at halting the process.
Earlier is genuinely better
Send photos and a history. Get a diagnosis, appropriate laboratory workup, and a treatment plan from a double board-certified dermatologist.
What a virtual hair loss consult involves
Photographs matter more here than in most conditions, and specific ones are needed: the top of the scalp from directly above, the part line, the hairline from the front, the crown from behind, and any discrete patches. Good lighting and dry hair make a real difference.
The history covers when the loss started, whether it was gradual or sudden, whether you are shedding actively, family history, recent illness or surgery, pregnancy, weight change, current medications, and any scalp symptoms such as itching, burning, or tenderness. Laboratory work is frequently ordered, and results can be reviewed remotely.
Frequently asked questions
Can hair loss be treated through a virtual dermatology visit?
Much of it can. Pattern hair loss and telogen effluvium — which together account for the large majority of cases — can usually be identified from photographs and a detailed history, and the standard treatments can be prescribed remotely. Scarring alopecias and unexplained hair loss often require an in-person examination and sometimes a scalp biopsy.
How long does hair loss treatment take to work?
Hair grows slowly, so patience is required. Most treatments need six months before meaningful change is visible and twelve months for a fair assessment. Minoxidil commonly causes a temporary increase in shedding during the first six to eight weeks as follicles synchronize into a new growth cycle; this is expected and not a reason to stop.
Can finasteride be prescribed online?
Yes, when clinically appropriate. Finasteride is prescribed after reviewing your medical history, current medications, and the potential side effects, which include sexual side effects in a minority of users. It is contraindicated in pregnancy and requires specific counseling for anyone who could become pregnant.
Is my hair loss permanent?
It depends entirely on the type. Telogen effluvium is almost always fully reversible once the trigger resolves. Pattern hair loss is progressive but treatable, and treatment can maintain and often partially restore density. Scarring alopecias destroy the follicle permanently, which is why early diagnosis matters so much in that group.
Does stress cause hair loss?
Significant physical or emotional stress can trigger telogen effluvium, in which a large number of follicles shift prematurely into the resting phase and shed together. The characteristic pattern is diffuse shedding beginning two to three months after the triggering event. Ordinary daily stress is not a common cause.
Do hair loss supplements work?
Correcting a documented deficiency — iron, vitamin D, or thyroid dysfunction — can genuinely help. Taking supplements without a deficiency generally does not, and excessive biotin can interfere with common laboratory tests including thyroid and cardiac assays. Testing before supplementing is the better sequence.
This page is general health information, not medical advice, and reading it does not create a physician–patient relationship. Treatment decisions depend on your individual history and examination. If you are experiencing a medical emergency, call 911 or go to the nearest emergency department.