Telogen effluvium is temporary, all-over hair shedding that starts about 2–3 months after a shock to the body, such as a high fever, surgery, childbirth, a crash diet or a new medication. Acute shedding usually settles within about 6 months, and most people see their normal fullness return within 6–9 months after the shedding stops, according to the American Academy of Dermatology (AAD). It affects men and women alike, and the follicles are not damaged: they are resting, and they restart.
Key takeaways
- Normal shedding is about 50–100 hairs a day; during telogen effluvium it can rise to as many as 300 a day.
- Shedding begins about 2–3 months after the trigger, which is why the cause is so easy to miss.
- Acute telogen effluvium usually settles within about 6 months; shedding that lasts longer than 6 months is called chronic telogen effluvium.
- Fullness typically returns within 6–9 months after shedding stops, as new hairs grow about 1 cm (½ inch) a month.
- Telogen effluvium thins hair evenly all over; pattern hair loss is gradual and patterned (temples and crown in men, a widening part in women).
What is telogen effluvium?
Telogen effluvium is a timing problem in the hair cycle: too many follicles enter their resting phase at once, then release their hairs together a few months later. The follicles themselves stay healthy.
Every hair runs its own cycle. Anagen, the growth phase, lasts 2–7 years. Catagen is a short transition of a few weeks. Telogen is the resting phase, around three months, after which the old hair is released and a new anagen hair grows in behind it. At any moment about 85–90% of scalp hairs are in anagen, which is why losing 50–100 hairs a day goes unnoticed.
In telogen effluvium, a physiological shock pushes a much larger share of growing hairs into telogen at the same time. The Cleveland Clinic puts it at up to 70% of growing hairs. Nothing visible happens for weeks, because those hairs still have to finish their rest. Then they shed together, and the drain, the brush and the pillow suddenly look very different.
The classic description comes from Headington's 1993 review in Archives of Dermatology, which set out five different ways the cycle can be disrupted to produce the same visible result (Headington 1993). The most common is "immediate anagen release", where a shock ends the growth phase early.
What causes telogen effluvium?
The trigger is almost always something that happened 2–3 months before the shedding began, not something from last week. Recognized triggers listed by the AAD and the Cleveland Clinic include:
- Illness with a high fever, including flu and COVID-19
- Surgery or a serious illness
- Childbirth, the most common version of all, covered in our guide to postpartum hair loss
- Rapid weight loss (the AAD names losing 20 pounds or more) or a very low-protein diet
- Low iron stores and other gaps covered in nutritional deficiencies linked to hair loss
- Thyroid problems, both underactive and overactive
- Severe or sustained emotional stress, such as bereavement, divorce or a long period of strain; see can stress cause hair loss
- Medications, including retinoids, beta-blockers, calcium channel blockers, some antidepressants and NSAIDs, plus starting or stopping hormonal birth control
Triggers often overlap. In midlife, a hormonal shift, months of poor sleep and a new prescription can arrive in the same season, and any one of them could be enough. A 2015 review in the Journal of Clinical and Diagnostic Research stresses that pinning down the cause takes a careful history plus lab tests to rule out thyroid, nutritional and autoimmune problems (Malkud 2015).
How long does telogen effluvium last?
Acute telogen effluvium usually settles within about 6 months of the shedding starting, and fullness returns within 6–9 months after it stops. The timeline is what makes the condition feel alarming and, once you understand it, reassuring.
| Stage | Typical timing | What you notice |
|---|---|---|
| Trigger | Month 0 | Usually nothing. Hair looks normal. |
| Shedding starts | About 2–3 months after the trigger | Noticeably more hair in the drain and brush; up to about 300 hairs a day instead of 50–100. |
| Shedding settles | Within about 6 months of starting (acute TE) | Daily loss drifts back toward the normal range. |
| Regrowth | The months after shedding stops | Short, upright new hairs along the hairline and part, growing about 1 cm a month. |
| Fullness returns | Within about 6–9 months after shedding stops | Volume looks normal again; length takes longer to catch up. |
If shedding continues past 6 months, it is called chronic telogen effluvium. In a small long-term study, Sinclair followed five women with chronic telogen effluvium. Four were followed for at least seven years: their shedding came and went, but serial photographs showed no visible drop in hair density and biopsies showed no follicle miniaturization. The fifth developed female pattern hair loss within 18 months (Sinclair 2005). The practical lesson: chronic shedding tends to fluctuate rather than progress, and a part or crown that keeps thinning points to something else worth checking.
Volume comes back long before length does. New hairs that appear in the months after the shed will reach shoulder length in about two to three years.
Is it telogen effluvium or pattern hair loss?
Telogen effluvium is sudden and diffuse; pattern hair loss (androgenetic alopecia) is gradual and follows a recognizable shape. The two can also overlap, which is why the distinction matters.
| Feature | Telogen effluvium | Pattern hair loss in men | Pattern hair loss in women |
|---|---|---|---|
| Onset | Sudden, over weeks | Gradual, over years | Gradual, over years |
| Where | Even, all over the scalp | Receding temples and thinning crown (Norwood scale) | Widening part and thinning on top, front hairline usually kept (Ludwig scale) |
| Shedding | Heavy and obvious | Often not much above normal | Often not much above normal, sometimes in phases |
| Shed hairs | Full-length, normal thickness, small white bulb at the root | Increasingly fine, short hairs (miniaturization) | Increasingly fine, short hairs (miniaturization) |
| Trigger | Usually identifiable, 2–3 months earlier | Genetics and androgens such as DHT | Genetics and hormones |
| Course | Self-limiting once the trigger is gone | Gradually progressive | Gradually progressive |
The practical tell is the shape. If your hair feels thinner evenly from front to back and side to side, telogen effluvium is more likely. If your temples or crown have been creeping back for years, or your part is wider than in photos from five years ago while the sides look fine, pattern hair loss is more likely. Our guide to androgenetic alopecia in women covers the female pattern in detail.
A heavy shed can also unmask pattern thinning that was already under way. When the shed is over, hair returns to the density you truly had, not the density you remember. If the part, temples or crown still look thinner once shedding has stopped, a dermatologist can tell you whether pattern hair loss is part of the picture.
How is telogen effluvium diagnosed?
A dermatologist usually diagnoses telogen effluvium from your history, a scalp exam and a few blood tests. Most of it is quick and non-invasive.
- History: the key question is what happened 2–3 months before the shedding began. Bring a list.
- Pull test: the doctor gently tugs small sections of hair to see how many resting hairs come out.
- Trichoscopy: a magnified look at the scalp shows whether hairs are of even thickness (telogen effluvium) or mixed fine and thick (pattern hair loss).
- Blood tests: ferritin, a full blood count, thyroid function, vitamin B12 and often vitamin D. Our guide to blood tests for hair loss explains which to ask for and how to prepare.
Before the appointment, it helps to know your own baseline. Our article on how much hair loss is normal explains what the 50–100 figure means and how to track change without counting every hair.
What helps recovery from telogen effluvium?
Telogen effluvium resolves once the trigger is fixed. Your job is to remove anything that keeps it going and give the cycle time to reset.
- Find and fix the trigger. If a blood test shows low ferritin, low vitamin D or abnormal thyroid function, correcting it with your doctor is the most useful single step.
- Eat enough protein and calories. Hair is built from keratin, and follicles are among the first tissues to be deprioritized when intake drops.
- Don't stop a medication on your own. Ask the prescriber whether the drug is a known trigger and whether an alternative exists.
- Be gentle with the hair you have. Tight styles, high heat and chemical processing don't cause telogen effluvium, but they break hairs at a time when you want to keep every one.
- Track it with photos. Take dated photos of your part, hairline and crown in the same light. A 90-day comparison gives a first fair read; 6 months shows clearly whether it is resolving.
Doctors sometimes prescribe topical minoxidil for chronic telogen effluvium. It can cause a temporary increase in shedding when started, so it is a decision to make with a dermatologist.
A gentle routine keeps the scalp comfortable while hair regrows, and it gives you a calm daily habit instead of checking the drain each morning. If your hair and scalp feel dry, Folliq 100% Unrefined Batana Oil makes a simple pre-wash treatment: warm a small amount, massage it into your scalp and hair, leave it on for at least 20 minutes, then wash as usual. It comes with a 90-day money-back guarantee. Our guide to building a scalp care routine shows how to add steps one at a time.
When to see a doctor
Most telogen effluvium settles without treatment, but see a doctor or dermatologist if you notice any of these:
- Patchy loss or bald spots with clear edges, rather than even thinning
- Hair coming out in clumps, or sudden, severe loss
- Scalp pain, burning, itching, scaling or redness
- Shedding that continues past 6 months, especially with no obvious trigger
- Other symptoms such as fatigue, unexplained weight change, feeling cold or very heavy periods
- Thinning at the temples, crown or part that remains after the shedding has stopped
FAQ
Can telogen effluvium cause permanent hair loss?
Telogen effluvium itself doesn't destroy follicles; they rest and then restart. What can look permanent is pattern hair loss that the shed revealed. If your hair hasn't returned to its usual fullness within about 6–9 months after shedding stops, ask a dermatologist to check for pattern thinning.
How do I know telogen effluvium is ending?
The first sign is fewer hairs on wash days and in the brush. The second is a fringe of short, fine hairs standing up along the hairline and part. Those are new hairs, not breakage, and they appear together because the old hairs left together.
Can COVID-19 cause telogen effluvium?
Yes. A high fever or serious infection is one of the best-known triggers, and COVID-19 is no exception. Shedding typically shows up about 2–3 months after the illness and follows the same recovery pattern.
Does telogen effluvium affect men?
Yes. It is diagnosed more often in women, partly because longer hair makes shedding more visible, but men get it after the same triggers. In men it usually shows as thinning all over rather than at the temples or crown, which helps tell it apart from male pattern hair loss.
Does washing my hair make telogen effluvium worse?
No. Washing collects hairs that were already released from the follicle; it doesn't release new ones. Washing less often just saves more hairs for the next wash day, which can make the drain look worse.
Folliq products are cosmetic scalp-care products, not medical devices or medicines, and are not intended to diagnose, treat, cure or prevent any disease. The studies discussed here used clinical devices and preparations, which is why every Folliq product comes with 90 days to try it for yourself. If your hair loss is sudden, patchy or painful, see a dermatologist.
References
- Headington JT. Telogen effluvium. New concepts and review. Archives of Dermatology. 1993. PubMed 8447677
- Malkud S. Telogen effluvium: a review. Journal of Clinical and Diagnostic Research. 2015. PubMed 26500992
- Sinclair R. Chronic telogen effluvium: a study of 5 patients over 7 years. Journal of the American Academy of Dermatology. 2005. PubMed 15692504
- American Academy of Dermatology. Do you have hair loss or hair shedding? aad.org
- Cleveland Clinic. Telogen effluvium. clevelandclinic.org