დასაწყისი · კატალოგი · პროფილი · ცხრილი
გარეგნობა BODY HANDBOOK
გარეგნობა · §691
Hair Shedding (Telogen Effluvium)
You count the hairs in the drain. You have been counting for six weeks. The version of this you are afraid of — quiet, unfair, on no timeline you agreed to — is almost never what is actually happening. What is happening is a wave of follicles that, two or three months ago, all decided to rest at once after some specific thing your body went through; they are letting go now, on schedule, and another wave is already growing in behind them. The job of this entry is to name what triggered yours, rule out the small list of fixable causes, and give you the realistic timeline back.
რეაგირე · საჭიროებისამებრ მტკიცებულება ზომიერი თავი გარეგნობა

Most of what looks like going bald is telogen effluvium — a temporary, named, self-resolving condition triggered by something that happened two to three months ago. A single blood panel under two hundred dollars catches the few causes worth fixing (low iron, an under-active thyroid, a sneaky drug). Then time does the rest: shedding slows by month four, density returns by month nine to twelve. The one thing not to do is grab a bottle of biotin — it does nothing for hair you don't already need biotin for, and it quietly distorts the thyroid labs you actually need.

Each follicle on your scalp runs its own clock. It spends two to seven years actively growing a hair (anagen), about two weeks shutting that hair down (catagen), and then about three months resting with the finished club hair still parked in the follicle (telogen). At any moment, around 85 to 90 of every 100 follicles on your head are growing and 10 to 15 are resting, all on slightly offset timers. The resting hair gets pushed out when the next growth phase starts underneath it. That release is your baseline shed — fifty to a hundred hairs a day for a healthy adult Headington 1993.

Telogen effluvium is what happens when something jolts a large fraction of those follicles into rest at the same time. Two or three months later — the length of telogen — they all release on roughly the same schedule. The brush fills up. The shower drain fills up. The hair coming out is not damaged or unhealthy; it is finished and on time. It just happens to be coming out in a clump rather than spread across the next few months Malkud 2015.

One implication that surprises people: the hair you are losing this week was committed to falling out around the time of whatever happened two to three months ago. The shedding is the past arriving on a delay, not the present accelerating.

The list of things that trigger it

The trigger list is short, well-mapped, and almost always recoverable. Cast your mind back to the months before the shedding started and one of these usually fits.

  • A high fever or a bad illness. Influenza, severe gastroenteritis, anything that put you in bed for days. COVID-19 in particular produced a near-textbook wave of telogen effluvium across early-pandemic cohorts, with the modal onset around eight weeks after symptoms Mieczkowska et al. 2021.
  • Surgery or general anaesthesia. A documented trigger; even a smooth surgery counts.
  • A baby. The hormones of pregnancy keep more of your follicles in the growth phase than usual; when they drop at delivery, that whole extra wave moves into rest. Roughly two in five women see visible shedding three to six months postpartum, and effectively all of them see some shift in how their hair grows Lynfield 1960. This is the cleanest natural example of the mechanism and the one that resolves most reliably without doing anything.
  • Severe psychological stress. Bereavement, divorce, redundancy, sustained burnout. In animal models, the nerve signals around the follicle (substance P, CRH) push hairs into rest under sustained stress; the human evidence is more circumstantial but the trigger-to-shed pattern is real Peters et al. 2006.
  • Crash dieting. A sustained deficit of more than around 450 calories a day, or a sudden very-low-protein phase, triggers it within a few weeks of starting Rushton 2002. Eating disorders and the aftermath of bariatric surgery are the severe end.
  • A new drug — or stopping an old one. Retinoids (including isotretinoin), beta-blockers, ACE inhibitors, blood thinners, anticonvulsants, SSRIs and SNRIs, lithium. Stopping the oral contraceptive pill is the same mechanism in reverse Malkud 2015.
  • Low iron. This one is contested at the edges (more on that below), but a clearly low ferritin in someone with heavy periods or a vegetarian diet is a routine and fixable cause Trost et al. 2006.
  • A thyroid that's off. Both an under-active and an over-active thyroid produce diffuse shedding. In one series of eighty patients with thyroid dysfunction, roughly four in ten of the hypothyroid group and one in four of the hyperthyroid group had visible diffuse hair loss Vincent & Yogiraj 2013.

Two patterns are worth flagging. First: the iron picture. The intuitive rule — low ferritin causes shedding, replacement fixes it — has a strong mechanistic story and a long clinical tradition. But the biggest case-control study on the question, of 381 women, found no significant ferritin difference between women with chronic shedding and matched controls Olsen et al. 2010. The honest line is: treat genuine deficiency (ferritin under thirty, especially with the matching symptoms — tiredness, breathlessness on stairs, brittle nails), and be sceptical of the "push it over seventy specifically for hair" advice; that target is mechanistically defensible but not proven in a trial.

Second: the thyroid picture is more straightforward. If shedding is happening, get the TSH. If it is off, treat it; the shedding typically normalises along with the rest of the symptoms over a few months.

What to actually do

Two things, in order. Find the cause. Then wait.

The finding part is a tight panel — not a fishing expedition, not a trichology clinic's twenty-tube workup. A primary-care doctor can order all of these, and most are insurance-covered.

Then the waiting part. Acute telogen effluvium resolves on its own once the trigger has cleared. The shed rate normalises by month four; new hairs are visible as short broken stubble around the hairline by month six; full visible density returns by month nine to twelve Malkud 2015Hughes & Saleh 2023. Nothing you do will compress that schedule much. The follicle has its own clock.

If you want a backstop — particularly if the shedding has lasted past six months, or if you have an underlying pattern hair loss being unmasked by it — topical minoxidil 5% (foam or solution, twice a day, dry scalp) shortens the resting phase and lengthens the growth phase. It produces a paradoxical extra shed in the first two to eight weeks; that is the mechanism working, not a setback. Low-dose oral minoxidil — under prescription, usually 0.25 to 2.5 mg a day — is the newer move for chronic cases, with a growing case-series base but limited formal trial evidence Perera & Sinclair 2017.

Where labs name a cause — low iron, a thyroid problem, a drug effect — treat that. Iron replacement at the doses your GP prescribes will raise ferritin over three to six months and is appropriate when ferritin is clearly low. Thyroxine replacement (for under-active thyroid) restores both the labs and the hair on the same timeline. Stopping or swapping a culprit drug typically resolves the shed within four months of the switch.

What not to do — especially the biotin thing

The hair-supplement market exists because the shedding feels unbearable and the protocol above is mostly waiting. The honest answer is that almost none of it works on hair you do not already have a deficiency in.

The single most-bought ingredient is biotin, and the case against it is unusually clean. Reviewers found that every documented case of biotin supplementation visibly helping hair was a person who had an actual biotin-deficiency syndrome — a rare condition with other symptoms, not the everyday reader buying a high-street bottle Patel et al. 2017. The harm goes past wasting money: the doses in popular hair supplements (typically 5 to 10 milligrams a day, hundreds to thousands of times the daily requirement) interfere with how labs measure thyroid hormones and the heart-attack marker troponin. People have had missed heart attacks and falsely-normal thyroid panels because of it. The American hair-loss working groups and most clinical labs now ask patients to stop biotin for at least two days before any blood draw Patel et al. 2017.

A few other persistent ones:

  • "More protein / collagen peptides will fix it." Protein deficiency does produce shedding, but only at the level of sustained severe under-eating Rushton 2002. The well-fed reader gets nothing extra from doubling protein. Collagen peptides have no controlled-trial evidence for hair density at all Guo & Katta 2017.
  • "I should switch shampoos." Shampoo does not cause this. The shedding is at the level of the follicle, weeks ahead of when the hair surfaces; the wash is just where you notice it.
  • "I'm going bald." A shed visible enough to terrify you in the shower is almost never visible enough for other people to see. Real telogen effluvium has to push more than around half of your follicles into rest simultaneously to produce obvious thinning, and that is the severe end of severe. The mirror you stare at is calibrated for catastrophe; the part-line photo at week zero versus week eight is not.
  • "It's androgenetic — I need finasteride." Sometimes true (more often in men), and the two conditions can coexist. But reflex prescribing of pattern-hair-loss drugs to anyone with a shed is a real failure mode. Pattern hair loss is slow, patterned (temples, crown), and produces miniaturised hairs, not bulk shedding. If the timeline fits a recent trigger and the loss is diffuse rather than patterned, this is telogen effluvium, not androgenetic alopecia Mubki et al. 2014.

If you're still shedding at month nine

The protocol above resolves most acute cases inside six months. If you are still shedding at month nine, one of four things is true, and they have different fixes.

  • The trigger is still there. An unresolved thyroid disorder, ongoing severe stress, or a crash diet that never ended. The body cannot finish a shed cycle while the cause is still active. Re-walk the trigger list with this in mind.
  • It was misdiagnosed. The most common quiet error is undiagnosed pattern hair loss in someone who also had a transient shed. The shed resolves; the pattern loss is still there, slowly progressing, and looks to the reader like the shedding "never stopped." A dermatologist's trichoscopy distinguishes these cleanly — pattern loss shows miniaturised hairs and reduced density at the crown or temples; pure shedding shows empty follicles and short regrowing hairs uniformly across the scalp Mubki et al. 2014.
  • It has become chronic. A small fraction of people develop chronic telogen effluvium, in which the shedding persists at a lower level for years before spontaneous remission. Sinclair's longitudinal series of five patients found episodes that lasted from three to eight years, eventually resolving without permanent baldness Sinclair 2005. This is the form low-dose oral minoxidil is increasingly used for.
  • The labs were distorted. If you were on a high-dose biotin supplement when the bloods were drawn, the thyroid panel in particular may have read normal when it was not. Stop the biotin and retest Patel et al. 2017.

If two of those have been ruled out and the shedding still has not stopped, see a dermatologist rather than another general practitioner. The differential is narrower at that point and the trichoscopy itself is diagnostic.

The timeline back

This is the section to come back to in the bathroom, on the bad mornings.

For acute, single-trigger telogen effluvium with the cause identified and removed:

  • Weeks one to four after starting. No change. You are still in the active shed. Brushing and washing still produce the count.
  • Months two to four. The shed rate slows. The visible difference is internal — you stop dreading the shower, because the count starts dropping below where it was at peak. Other people still notice nothing.
  • Months four to six. Run your hand along your hairline in good light. You start to see short, dark, fine new hairs standing up at an angle — a few centimetres long, perpendicular to the scalp. These are the new growth phase coming through. The part line stops widening Malkud 2015.
  • Months six to nine. Density visibly increases. The hairdresser notices. A close partner stops carefully not-mentioning it. The new hairs reach blendable length.
  • Months nine to twelve. You stop thinking about it. The brush comes out close to empty. You catch sight of yourself in a window and the hair is the hair you had before Hughes & Saleh 2023.

That is the median trajectory for the common case. Where iron deficiency is the cause, replacement at the prescribed dose has the shed reduction tracking the rising ferritin over the same three to six month window Trost et al. 2006. Where thyroid disease is the cause, the hair recovery and the rest of the recovery (energy, weight, mood) arrive on the same schedule together Vincent & Yogiraj 2013. Where minoxidil is added, the regrowth curve sits a few weeks earlier and the density at six months is somewhat higher Perera & Sinclair 2017.

There is also a permanent payoff, separate from the hair. Once you have recognised one of these episodes, you will recognise the next one — the late-March shed after a stressful winter, the August shed two months after a bad flu in June — the day it begins, name it the same hour, and not lose the bandwidth you lost the first time. The skill becomes yours.

Related but not this

A few things share the symptom of "more hair coming out than usual" but are different conditions with different management. If your situation does not fit the picture above — sudden patches of total loss, painful scalp, hair coming out from a slow recede at the temples rather than a diffuse thinning — one of these is closer to what you have:

  • Pattern (androgenetic) hair loss — gradual, patterned at the temples, crown, or central part; produces miniaturised hairs rather than bulk shedding. Slow over years, not weeks. Often overlapping with telogen effluvium in the same person.
  • Alopecia areata — sudden coin-sized smooth patches of total hair loss. An autoimmune condition with its own treatment path.
  • Scarring alopecias — frontal fibrosing alopecia, lichen planopilaris, central centrifugal cicatricial alopecia. The follicles are destroyed permanently, so urgency to see a dermatologist is higher.
  • Traction alopecia — from sustained tight pulling (braids, ponytails, extensions). Hairline-localised; reversible early, permanent late.
  • Anagen effluvium — the abrupt total shed caused by chemotherapy and a few other cytotoxic exposures. Different mechanism, different timeline Saleh et al. 2023.
·
691