Telogen effluvium: recognising a shedding phase that will stop

Summary

Your hair has been coming out in handfuls for a few weeks and nothing in your recent life seems to account for it. Very often this is telogen effluvium: a temporary disturbance of the hair cycle that pushes an abnormal share of your follicles into rest at the same moment. The name is alarming. The mechanism behind it reverses in the large majority of cases.

We see these patients every week in Istanbul, convinced they are going bald. Our first job is not to offer them surgery. It is to settle one question: will this shedding stop on its own, or are you looking at a form of hair loss that will not stop?

A hair cycle that tips over all at once

A hair lives through a cycle in three stages: the anagen phase of active growth, the short catagen phase of transition, then the telogen phase of rest and shedding. Normally the vast majority of your hair is growing, and only a small fraction is resting.

Telogen effluvium turns that balance upside down. Under the effect of a shock, a mass of follicles leaves growth early and goes into rest all together. So they will also shed all together. How much hair do you lose per day in normal circumstances? Somewhere around 80 to 100. During an effluvium that figure often passes 200, sometimes considerably more.

Hold on to this: the follicle is not destroyed, it is asleep. That is exactly what separates this kind of diffuse hair loss from pattern baldness, where the follicle exhausts itself and then disappears for good.

Infographic titled The hair cycle takes place in three phases, showing the anagen phase of hair growth lasting 2 to 5 years, the catagen phase where growth stops lasting 2 to 3 weeks, the telogen phase with hair loss lasting 2 to 4 months, then a new anagen phase

The two to three month gap, the signature of the condition

This is what fools nearly everyone, patients and sometimes doctors too. The shedding does not arrive at the moment of the shock. It arrives two to three months later.

A follicle tipped into rest keeps its hair anchored for a while before letting go. The consequence is that by the time the shedding becomes visible, the triggering event is already well behind you. You have recovered from the flu, your surgery has healed, your diet is over. The connection no longer makes itself.

So people look for a reason in the present. A shampoo they changed, the tap water, a dye. And they walk straight past the real culprit, which sits in the previous quarter. In consultation we go back through the calendar over four to six months as a matter of routine. That is usually where everything falls into place.

Bearded man looking at a lock of shed hair held between his fingers

The triggers we actually find

A serious physical shock

Childbirth, surgery under general anaesthetic, a high fever during an infection: the body puts its hair capital on hold to save resources. Postpartum hair loss is the most common case and the best documented one, and it almost always resolves by itself.

Woman sitting on the edge of her bed on waking, face buried in her hands, exhausted

Intense or drawn-out stress

A bereavement, redundancy, months of overload. The link between stress and hair loss is real, but it works with the same delay as every other trigger. Shedding that starts the morning after bad news probably has another origin.

Man in shirt and tie shouting in an office, sheets of paper flying through the air

Rapid weight loss or an iron deficiency

A very restrictive diet, bariatric surgery, a slimming treatment: we regularly see hair shedding follow rapid weight loss. Iron deficiency, for its part, comes up again and again in the literature. In a series of over 3,000 patients, low iron was among the laboratory abnormalities found most often (Yorulmaz et al., 2021).

A thyroid disorder

Both an underactive and an overactive thyroid throw off the rhythm of the follicle. The link between thyroid problems and hair loss is nonetheless less consistent than it is often made out to be: a retrospective study from 2024 concludes that thyroid dysfunction accounts for only a minority of effluvium cases (Bin Dayel et al., 2024). It has to be looked for, not assumed.

Woman feeling the base of her neck where the thyroid gland sits

Hormonal swings

Coming off contraception, the menopause settling in, a hormone treatment that has been changed. Hormone-sensitive follicles react to those shifts, and the hair sometimes pays for the transition.

Medical diagnosis sheet marked Menopause, lying next to a prescription and tablets

Certain medicines

Anticoagulants, retinoids, beta blockers, antidepressants. The list of medicines that cause hair loss is long, and the effect depends on the individual. Never change a prescription on your own initiative: raise the symptom with whoever prescribed it, and they will judge whether an alternative exists.

Balding man with his head in his hands in front of tablets scattered on a table

Acute or chronic: two different stories

Acute effluvium lasts less than six months. An identifiable trigger, a clear burst of shedding, then a spontaneous halt. Regrowth starts afterwards, and it takes several months before the density returns to what it was. That is a long stretch to live through, but the outcome is good.

Chronic effluvium is a different matter. The shedding settles in and carries on beyond six months, sometimes for years, often with no single trigger. It affects mainly women (Karakoyun et al., 2025). Here something persistent is at work: an uncorrected deficiency, a metabolic disorder, ongoing fatigue that never resolves. As long as that factor holds, the shedding holds with it.

Woman looking at her hairbrush loaded with shed hair

The blood tests to ask for, and why

Before any treatment, you need numbers. The useful panel is short and your GP can order it.

Ferritin first, which measures your iron stores rather than just the iron in circulation. Then TSH, for the thyroid. And a full blood count, which picks up anaemia. Depending on the context, vitamin D and zinc are worth adding: a 2024 study of the complete biochemical status of patients with effluvium found frequent shortfalls in ferritin and vitamin D (Durusu Turkoglu et al., 2024).

The panel has another virtue. It stops you taking food supplements blindly for six months without knowing whether they are filling any gap at all. Correcting a genuine deficiency changes the trajectory. Supplementing a patient who has no deficiency changes nothing.

Dr Emrah Cinik in a white coat and surgical mask, gloved, in the middle of an explanation

Effluvium or androgenetic alopecia: the question that decides everything

This is the heart of our work, and it is where a surgeon brings something a beauty column cannot. Because the answer determines whether a transplant makes any sense at all.

Effluvium is diffuse. The loss spreads across the whole scalp, including the back, and the hairline stays where it was. The hairs that fall have a normal calibre.

Androgenetic alopecia draws a pattern instead. It hollows out the temples, it works on the crown of the head, it spares the band at the back. Above all it miniaturises: hairs in the affected zone become finer and shorter before they vanish. That is what we look for under magnification, and it is the most reliable sign there is. The Norwood-Hamilton scale exists precisely to place that drawn-out progression, which an effluvium never produces.

Close-up of a man's scalp, hair parted by hand, receding temple and visible skin

When an effluvium uncovers baldness that was advancing quietly

This scenario is more common than people imagine, and nobody talks about it. A patient goes through an effluvium. The heavy shedding empties the scalp in one go. And it lays bare an androgenetic alopecia that had been progressing discreetly for years, hidden by the density that was still there.

The effluvium stops, as expected. But the hair does not come back to its previous level, because part of the capital had already gone. The patient then believes the effluvium caused his baldness. It did not cause it. It uncovered it.

Hence our rule. We do not draw conclusions about a head of hair that is in the middle of shedding. We ask for time, long enough for the effluvium to finish, then we reassess on a stable footing. Only at that point does it become possible to say whether you are suitable for a hair transplant, and over how large an area.

Smiling patient in the operating room, hairline drawn in felt-tip on the scalp, flanked by two assistants

What genuinely supports the regrowth

Treating an effluvium means treating its cause first. Correct the deficiency, settle the thyroid, let the body recover from the shock. Everything else is support.

Topical minoxidil can shorten the difficult stretch by restarting dormant follicles. It is used on medical advice, and it sometimes makes the shedding temporarily worse over the first few weeks, which discourages anyone who was not warned in advance.

Medicine box printed with the chemical formula of minoxidil

A diet supplying enough protein and iron supports the manufacture of hair. Restorative sleep and a lower stress load help as well, without working miracles: they remove the factor keeping the problem going, they do not make anything grow back faster.

Oily food supplement capsules lying beside a wooden comb

Man with his eyes closed in a meditation posture, hands open on either side of his face

Why we refuse to transplant an effluvium

A transplant moves living follicles from an area that lasts into an area that has none left. It is the most durable treatment for androgenetic alopecia, because in that condition the follicles in the recipient zone really have gone.

In an effluvium, all your follicles are still there. They are asleep. Implanting grafts into a scalp in the middle of a hormonal or metabolic storm would achieve nothing: the grafts would be subject to the same disturbance as everything around them, and you would have spent a donor area that never rebuilds itself. A team offering you surgery during active shedding is not reading your file.

Our position fits into one sentence: you operate on a permanent loss, never on a loss in progress. If you are unsure what you are going through, get yourself examined by a practitioner who will take the time for magnification and for the calendar. Our team spends its hair transplant Turkey consultations on exactly this sorting, and we often send someone home with a blood test request rather than a surgical date.

Sources

Yorulmaz, A., Hayran, Y., Ozdemir, A. K., Sen, O., Genc, I., & Gur Aksoy, G. (2021). Telogen effluvium in daily practice: Patient characteristics, laboratory parameters, and treatment modalities of 3028 patients with telogen effluvium. Journal of Cosmetic Dermatology, 21(6), 2610-2617. https://doi.org/10.1111/jocd.14413

Durusu Turkoglu, I. N., Turkoglu, A. K., Soylu, S., Gencer, G., & Duman, R. (2024). A comprehensive investigation of biochemical status in patients with telogen effluvium. Journal of Cosmetic Dermatology, 23(12), 4277-4284. https://doi.org/10.1111/jocd.16512

Bin Dayel, S., Hussein, R. S., Atia, T., Abahussein, O., Al Yahya, R. S., & Elsayed, S. H. (2024). Is thyroid dysfunction a common cause of telogen effluvium? A retrospective study. Medicine, 103(1), e36803. https://doi.org/10.1097/MD.0000000000036803

Karakoyun, Ö., Ayhan, E., & Yıldız, İ. (2025). Retrospective review of 2851 female patients with telogen effluvium: A single-center experience. Journal of Cosmetic Dermatology, 24(2). https://doi.org/10.1111/jocd.70037