Key takeaways
- The shedding is delayed. It starts weeks to months after the trigger, which is why people rarely connect the two.
- It affects the whole scalp evenly and does not cause bald patches or scarring.
- The British Association of Dermatologists notes it usually gets completely better without treatment, though volume takes months to rebuild.
- Shedding that lasts beyond six months is called chronic and deserves a proper look for ongoing causes, such as low iron or thyroid problems.
- Repeated episodes can unmask female or male pattern thinning, which needs its own plan.
What is actually happening to my hair?
When someone puts a clump of hair on my desk, the first thing I want to do is lower the panic. So let me explain. See, what happens is this. At any time, most of your scalp hair (around 85%, according to DermNet) is in the growing phase and about 15% is resting. Resting hairs stay in the scalp for about three months, then fall out as a new hair pushes up beneath them. Losing up to about 100 hairs a day is normal.
A significant shock to the body can push a large number of growing hairs into the resting phase at the same time. DermNet notes that up to 70% of growing hairs can be affected. Nothing visible happens at first. Then, two to four months later, all those resting hairs shed within a few weeks of each other. That is the handful of hair in the shower, the clump on the comb and the black ring in the bathroom drain.
That is very important to understand: the follicles are not damaged. Each shed hair is usually being replaced by a new one already growing underneath.
What triggers it?
The British Association of Dermatologists and DermNet list a range of triggers. If you think back three months before the shedding started, you will usually find one.
| Trigger | Common Indian examples |
|---|---|
| High fever or severe infection | Dengue, typhoid, malaria, COVID, viral fevers in the monsoon |
| Childbirth | Shedding peaks about four months after delivery |
| Surgery or accident | Any major operation, including caesarean section |
| Rapid weight loss or extreme dieting | Crash diets before a wedding, very low protein intake, fast weight loss on medication |
| Nutritional deficiency | Low iron stores, low B12 (common in vegetarians) |
| Thyroid problems | Both an overactive and an underactive thyroid |
| Stopping hormone pills | Coming off the contraceptive pill |
| New medicines | Some blood pressure, mood and other medicines; never stop a prescribed medicine without your doctor |
| Severe emotional stress | Bereavement, exams, job loss, family upheaval |
In about one in three people, the British Association of Dermatologists notes, no clear cause is found. I tell people that honestly too.
How long does telogen effluvium last?
For a single trigger, the pattern is fairly predictable:
- Months 0 to 3 after the trigger: nothing obvious.
- Months 2 to 4: shedding starts, often suddenly.
- Next 3 to 6 months: shedding continues, then gradually slows. DermNet describes it tapering off over six to nine months.
- After that: short new hairs appear along the hairline and parting. Full volume can take many more months, because hair grows only about a centimetre a month.
If the trigger continues, for example ongoing iron deficiency or an untreated thyroid problem, the shedding continues too. The British Association of Dermatologists defines shedding lasting more than six months as chronic telogen effluvium. DermNet notes that chronic forms most often affect otherwise healthy women aged 30 to 60, sometimes with no clear trigger.
How is it diagnosed?
Mostly through the history and the examination: - Your timeline: what happened two to four months before the shedding began. - The pull test: I gently pull a small bunch of hairs. More than a few coming out, mostly with a small white bulb at the root (resting hairs), supports the diagnosis. The British Association of Dermatologists notes the test can be falsely negative if you washed your hair in the last 48 hours. - Scalp examination: looking for even thinning rather than patches, and checking for pattern thinning underneath. - Blood tests where the history suggests them, most commonly thyroid function, iron stores (ferritin) and vitamin B12. See which blood tests matter for hair fall.
A biopsy is rarely needed.
What helps it recover?
Here is the honest part. According to the British Association of Dermatologists, medicine does not speed up regrowth from a simple episode. What helps is removing the reasons for continued shedding, and protecting the hair while it rebuilds: - Correct deficiencies that are found: iron, B12, folate or thyroid. Do not take high-dose iron without testing first. - Eat enough protein. Dal, paneer, curd, eggs, chana, soya and sprouts at each meal matter more than any hair supplement, especially after illness or during weight loss. - Handle hair gently. Avoid tight buns, heated tools and harsh chemical treatments for a few months. - Use volumising shampoo, fibres or a shorter cut if the thinning bothers you. - Be patient with the timeline. Most of the anxiety comes from expecting results in weeks.
If shedding continues beyond six months, or your hair looks thinner on top than at the back, a doctor should check for pattern hair loss. DermNet notes that repeated episodes can sometimes evolve into female pattern hair loss. In that case treatment does help, and starting early matters. Read female pattern hair loss.
How we approach this at Dr Tvacha
Most people with simple shedding need reassurance, a clear timeline and perhaps one or two blood tests, not a long course of treatment. I would rather tell you to wait than sell you a course you do not need. At a Rs 499 hair diagnosis at our Thane, Andheri, Bandra or Dahisar centre, my team and I will tell you honestly whether this is shedding that should settle by itself, or underlying pattern thinning that needs a plan. If treatment is needed, the fee is given in writing before you pay. See our hair page or find a centre near you.
Frequently asked questions
How much hair fall is normal in a day?
Losing up to about 100 hairs a day is considered normal, and the British Association of Dermatologists gives a range of 30 to 150. You will lose more on hair-wash days, because loose hairs collect between washes. What matters is the change from your usual pattern. If you are suddenly losing far more than before, come and get it checked.
Can telogen effluvium make me go bald?
No. Telogen effluvium thins the hair evenly but does not cause bald patches, and the follicles are not destroyed. Hair usually regrows once the trigger has passed. If you see patches of complete baldness, or thinning only over the top of the scalp, a different condition such as alopecia areata or pattern hair loss may be involved, and that needs an examination.
Should I cut my hair short?
Only if you want to. Cutting hair does not change how many hairs shed, because shedding starts at the root. But shorter hair can look fuller, puts less weight and tension on fragile strands, and some people find it reduces the distress of seeing long hairs everywhere. Basically, it is a cosmetic choice, not a treatment.
Will oiling or a new shampoo stop the shedding?
No shampoo or oil can stop hairs that have already entered the resting phase from falling. Gentle oiling and a mild shampoo are fine for scalp comfort, but harsh rubbing can increase breakage. Shampooing often does not cause extra loss; it just collects hairs that were already loose. Recovery depends on time and on correcting the trigger.
Can stress alone cause telogen effluvium?
Yes. Severe emotional stress, such as a bereavement or a major life upheaval, is a recognised trigger. Everyday pressure is less likely to cause it on its own. Because the shedding starts two to four months later, people often think the hair fall is causing their stress, not the other way round. Read my guide to stress and hair loss for more.
Written by
Dr Amit KarkhanisAesthetic Physician · MBBS, Dip. Dermatology (UK) · Reg. No. 2001/02/1124Founder of Dr Tvacha, practising in Thane since 2005. Leads the weight loss and hair programmes.
Sources
- Telogen effluvium (DermNet)
- Telogen effluvium patient information leaflet (British Association of Dermatologists)
- Hair loss (NHS)
- Can COVID-19 cause hair loss? (American Academy of Dermatology)
- Hair loss in new moms (American Academy of Dermatology)
This article is for general education and does not replace a consultation. Medicines and treatments are prescribed only after a doctor's assessment. Last reviewed 25 October 2026.