Chronic Telogen Effluvium: Why Shedding Lasts and What Helps
Chronic telogen effluvium is the name for hair shedding that simply does not settle. Hairs come out by the handful in the shower and on the brush for months, sometimes years, yet the hair never goes bald and nobody can point to a single cause. This guide explains what CTE is, how it differs from ordinary shedding and from pattern thinning, what a GP will usually check, how to live with it day to day and what to realistically expect.
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Chronic telogen effluvium (CTE) is excessive hair shedding that carries on, steadily or in waves, long after the few months ordinary telogen effluvium lasts. DermNet says it tends to affect otherwise healthy women aged 30 to 60, often with thick hair, and that it does not cause complete baldness. A GP should check iron, thyroid, vitamin B12 and folate, and rule out pattern hair loss.
Key takeaways
- Losing up to about 100 hairs a day is normal, according to DermNet, because the scalp is always replacing resting hairs.
- Acute telogen effluvium usually shows 2 to 4 months after a trigger and tapers back to normal over 6 to 9 months in most cases.
- In CTE the shedding continues or keeps returning, sometimes for years, because the growth phase appears to be shortened.
- A 1996 study of 355 people found CTE follicles were not shrinking the way they do in pattern hair loss.
- Gentle care, fewer styling stresses and camouflage help the hair look fuller while the cause is investigated.
What is chronic telogen effluvium?
Chronic telogen effluvium is a long-running form of telogen effluvium in which more hairs than normal enter the resting (telogen) phase and fall out, and the increased shedding carries on intermittently or continuously for a long time. DermNet describes shedding that lasts for long periods, sometimes years, as if the hair cycle has been reset with a shorter growing phase.
It helps to know what normal looks like. DermNet explains that in a healthy scalp about 85% of follicles are actively growing hair and about 15% are resting. A follicle grows a hair for 4 years or so, rests for about 4 months, then a new hair pushes the old one out. That turnover is why losing up to about 100 hairs a day is ordinary.
In CTE that balance tips towards shedding and stays tipped. The good news, which DermNet is clear about, is that telogen effluvium does not cause complete baldness, and the follicles themselves are not being destroyed.
How is CTE different from acute telogen effluvium?
CTE differs from acute telogen effluvium mainly in how long it lasts and whether there is a clear trigger. Acute telogen effluvium follows an obvious shock such as childbirth, a high fever, surgery or a crash diet, shows 2 to 4 months later and, DermNet says, tapers back to normal over 6 to 9 months in most cases.
| Feature | Acute telogen effluvium | Chronic form (CTE) |
|---|---|---|
| Trigger | Usually clear: illness, childbirth, surgery, stress, diet | Often no clear trigger, or several overlapping ones |
| When it starts | 2 to 4 months after the trigger | Often abrupt, then fluctuating |
| How long it lasts | Usually settles over 6 to 9 months | Carries on or keeps returning, sometimes for years |
| Who it affects | Any age and either sex | Mostly otherwise healthy women aged 30 to 60, according to DermNet |
| Baldness | No | No |
Our guides to telogen effluvium and what causes telogen effluvium cover the short-lived form and its triggers in more depth.
What does the research say about CTE?
The research on CTE is limited, but one key study still shapes how it is understood. In 1996 the dermatologist David Whiting published findings on 355 people (346 of them women) with diffuse thinning of unknown cause, comparing scalp samples with people who had pattern hair loss and with healthy volunteers.
He found that in CTE the ratio of full-thickness terminal hairs to fine, miniaturised hairs was about 9 to 1, close to the 7 to 1 seen in healthy scalps, while in pattern hair loss it was about 1.9 to 1. In plain terms, the follicles in CTE were not shrinking. He also noted that CTE often began abruptly and ran a prolonged, fluctuating course.
Why this matters to you
If a specialist tells you your follicles look healthy under magnification, that fits the CTE picture. It is also why the hair often still looks reasonably thick to other people even while you are sweeping it off the bathroom floor.
What causes long-term shedding like this?
Long-term shedding like CTE often has no single identifiable cause, but several things can keep the hair cycle unsettled and are worth ruling out. DermNet lists triggers for telogen effluvium that include illness with fever, surgery, psychological stress, weight loss or restrictive diets, iron deficiency, some medicines, thyroid problems, stopping the contraceptive pill and scalp skin disease.
When one of these keeps recurring, or two overlap, the shedding can look chronic. Low iron stores and an underactive thyroid are two of the most common findings worth excluding, and the NHS lists iron deficiency among the causes of temporary hair loss. If you have started or changed any medicine in the months before the shedding began, mention it to your GP rather than stopping it yourself.
How do you tell CTE apart from pattern hair loss?
You tell CTE apart from pattern hair loss by looking at where the hair is thinning and what the shed hairs look like. Pattern hair loss in women usually shows as a widening parting with finer, shorter hairs, while CTE causes shedding of full-length hairs from all over the scalp, sometimes with slight recession at the temples.
| Problem | What is happening | What you will see |
|---|---|---|
| Hair shedding (including CTE) | Whole hairs fall from the root because more follicles are resting | Full-length hairs with a small white bulb, from all over the head |
| Hair loss (pattern thinning) | Follicles gradually shrink and make finer, shorter hairs | A widening parting or thinning crown, with little extra shedding |
| Hair breakage | The hair fibre snaps part-way along | Short, uneven pieces with no bulb, frizz and split ends |
The two can overlap. DermNet notes that shedding after childbirth can resolve or can run into female pattern hair loss, so a GP or specialist may look closely at the parting to check for miniaturised hairs. Our shedding timeline guide helps you work out whether your shedding is following the usual pattern.
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What will a GP usually check?
A GP will usually ask about your health over the past year, look at your scalp and hair, and arrange blood tests. DermNet recommends correcting any abnormality in thyroid function or in levels of iron, vitamin B12 and folic acid, and the NHS says a GP may be able to tell what is causing hair loss by looking at your hair.
A gentle pull test, where a small bunch of hairs is tugged lightly, often brings out more resting hairs than normal in telogen effluvium. Under a microscope, DermNet says, more than 25% resting hairs strongly suggests the condition. If the picture is unclear, a referral to a dermatologist may follow. Watermans does not give medical advice. If your question is about products or a routine rather than a medical one, you can talk to Gail Waterman, our co-founder, as an AI avatar on the Watermans homepage.
How can you care for your hair while shedding continues?
You can care for your hair while shedding continues by being gentle with it, keeping the scalp comfortable and reducing any extra breakage so the hair you have looks as full as possible. DermNet advises gentle handling, including care with combing and brushing, alongside a nutritious diet with plenty of protein, fruit and vegetables.
- Wash as often as your scalp needs. Washing does not cause shedding; it just collects hairs that were already coming out.
- Use a mild, sulfate-free shampoo and condition every wash to limit tangles and snapping.
- Detangle from the ends up with a wide-tooth comb while conditioner is in.
- Avoid tight ponytails and heavy heat, which add breakage to shedding.
- Keep a simple shedding diary with dates, stress, illness and diet changes, so patterns show up.
- Use camouflage when you want to, such as hair fibres at the parting or a softer, layered cut.
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How long does CTE last, and how can you cope?
CTE can last for years, and the course often fluctuates, with better and worse spells. That is frustrating, but the Whiting study and DermNet both describe healthy follicles and no progression to baldness, which is genuinely reassuring when the hair on the floor looks alarming.
Coping is as much about the mind as the hair. DermNet notes that the psychological effects of hair loss should not be ignored. Tell your GP if shedding is affecting your mood, lean on routines that make your hair feel nice on a bad day, and try not to count hairs daily; a monthly photo in the same light is a far better guide. Our guide on what genuinely helps hair shedding has more practical ideas.
What are the frequently asked questions about chronic telogen effluvium?
What is chronic telogen effluvium?
It is excessive hair shedding that carries on, steadily or in waves, for much longer than ordinary telogen effluvium, sometimes for years, without causing baldness.
How many hairs a day is normal?
DermNet says losing up to about 100 hairs a day is normal as part of the scalp's hair cycle.
Can CTE make me go bald?
No. DermNet states that telogen effluvium does not cause complete baldness, and a 1996 study found CTE follicles were not shrinking.
What blood tests should I ask about?
DermNet recommends checking thyroid function, iron, vitamin B12 and folic acid. Your GP will decide which tests suit you.
Is CTE the same as female pattern hair loss?
No. CTE causes all-over shedding of full-length hairs, while pattern hair loss causes gradual thinning, often at the parting. They can occur together.
Does washing my hair make shedding worse?
No. Washing collects hairs that were already loose. Being gentle with combing and styling is what matters.
What can make my hair look fuller meanwhile?
A gentle shampoo, conditioner, less heat and tension, and camouflage such as hair fibres can all help hair look fuller.
What is the bottom line on chronic telogen effluvium?
The bottom line on chronic telogen effluvium is that it is exhausting to live with but does not lead to baldness, and the follicles are not being destroyed. Get the common causes checked by a GP, especially iron, thyroid, vitamin B12 and folate, rule out pattern hair loss, keep a shedding diary and be kind to your hair and scalp day to day while the shedding runs its course.
For a simple first step in your routine, a gentle hair growth shampoo keeps the scalp clean and comfortable without stripping.
Sources & references
- DermNet, Telogen effluvium, checked 19 September 2026.
- Whiting DA, Chronic telogen effluvium: increased scalp hair shedding in middle-aged women, J Am Acad Dermatol 1996, checked 19 September 2026.
- NHS, Hair loss, checked 19 September 2026.
- NHS, Iron deficiency anaemia, checked 19 September 2026.
- NHS, Underactive thyroid, checked 19 September 2026.
- DermNet, Female pattern hair loss, checked 19 September 2026.
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