Hair Loss in Teenagers: Causes and When to See a GP
This page is about hair and scalp only. For anything about puberty itself or medicines, speak to a GP or see the NHS.
Hair loss in teenagers is more common than most parents expect and is usually temporary, with the four usual causes being tight styling, heat damage, a shedding episode after illness or stress, and iron running short during a growth spurt. Patchy loss or a sore scalp is different and needs a GP. This guide explains how to tell them apart.
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Key takeaways
- Losing up to 50 to 100 hairs a day is normal at any age, so a full hairbrush is not by itself a sign of anything.
- Most teenage hair problems are breakage from heat and tension rather than anything happening at the follicle.
- Shedding after illness, a fever, rapid weight loss or a stressful term shows up two to three months later, which hides the cause.
- Patchy bald areas, a sore or scaly scalp, or hair coming out in clumps should be seen by a GP rather than managed at home.
- Growth products and supplements are not appropriate for under-18s. Gentle care that stops hair snapping is.
What causes hair loss in teenagers?
Four causes account for most teenage hair problems, and only one of them involves the follicle at all. Tight styling pulls hair out at the root over time. Heat and chemistry snap the fibre partway along. A shock to the system tips growing hairs into rest. Low iron during a growth spurt does the same thing more slowly.
| Cause | What it looks like | What helps |
|---|---|---|
| Tight styles and extensions | Thinning along the hairline and around the temples, sometimes soreness after styling | Looser styles, worn lower, varied day to day |
| Heat and chemical damage | Short broken pieces with blunt ends, frizz, length that never increases | Lower heat settings, a protective spray, conditioner every wash |
| Shedding after illness or stress | A sudden wave of full-length hairs with pale bulbs, two to three months after the event | Time, gentle handling, normal washing |
| Low iron or rapid weight change | Diffuse thinning with tiredness or breathlessness alongside it | A GP appointment and a blood test, not guesswork |
| Patchy loss with smooth edges | Round or oval bare areas appearing over weeks | See a GP. This is not something to manage at home |
Two of those five are about the fibre, two are about the body, and one needs a GP. Our pages on hair loss in children and the six main causes in children cover the younger age group, where fungal scalp infection and hair pulling are far more common than they are in teenagers.
How much shedding is normal for a teenager?
Up to about 100 hairs a day is normal, and that figure does not change with age. DermNet explains that roughly 85 per cent of scalp follicles are actively growing and about 15 per cent are resting at any moment, and the resting ones release their hair on their own schedule. A follicle grows a hair for years, then rests for about four months, then starts again.
What changes in the teenage years is not the shed, it is the attention. A fourteen-year-old washing and styling their own hair for the first time sees what was always happening, often on a dark bathroom floor where it is very visible. Before panicking about a number, take one photograph of the parting, because that is the measurement that matters.
Is it hair loss, hair shedding or hair breakage?
Telling these three apart takes about thirty seconds and saves buying the wrong thing entirely. Pick up a lost hair and look at the end of it under a decent light, because the end of the strand tells you which of the three problems you actually have.
- Hair breakage is a fibre problem. Short pieces with blunt ends and no bulb, of uneven length. The follicle is fine; the strand snapped. This is the most common teenage answer by a distance.
- Hair shedding is a cycle problem. Full-length hairs with a small pale bulb at the root, in bigger numbers than usual, arriving in a wave and settling within a few months.
- Hair loss is a follicular problem. Density genuinely falls, either in patches or slowly across the parting or temples. This is the one that most often needs a GP.
If nearly everything you find is short and blunt-ended, the problem is in the styling routine and not in the body. Our hair breakage guide sets out the fixes, and our page on telogen effluvium covers the shedding case.
Can tight hairstyles cause hair loss in teenagers?
Tight styling is one of the few causes that is genuinely preventable, and it is worth taking seriously early. DermNet describes traction alopecia as hair loss from prolonged or repetitive tension on the scalp, first reported in 1907 in people who had worn tight ponytails, and lists tight chignons, cornrows, dreadlocks, weaves, braids, extensions, chemical relaxers and rollers among the causes.
The early signs are easy to miss because they appear where hair is finest anyway: thinning along the front hairline, around the temples, or wherever the style pulls hardest. Soreness or small bumps after styling is the clearest warning. The important point for a teenager is that early traction changes are usually temporary, while years of the same tension can eventually become permanent, so loosening the style now is the whole intervention.
Practical version: wear the style lower and looser, move the parting and the position regularly, take extensions out on schedule rather than leaving them an extra fortnight, and never accept a style that hurts.
Does heat styling cause hair loss in teenagers?
Heat causes breakage rather than loss, and the distinction matters because the fix is completely different. Straighteners and curling wands run hot enough to damage the fibre directly, and hair that is straightened daily from thirteen has taken years of that by the time anyone worries about it. The follicle is untouched; the strand simply snaps before it reaches any length.
Three changes do almost all of the work. Turn the temperature down, because most hair does not need the highest setting. Always use a protective spray on dry hair before any heat. And skip a day or two a week entirely, since the damage is cumulative and the days off are what let length build up.
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A conditioner built to reduce breakage, used on the mid-lengths and ends every wash. Ordinary, gentle, everyday care rather than anything claiming to change what the follicle is doing.
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Can exam stress cause hair to fall out?
Stress can trigger a shedding episode, and the delay is what makes it so confusing. DermNet notes that after a shock to the system as many as 70 per cent of growing hairs can be pushed into the resting phase, and a resting hair is not released for about three months. So a brutal exam term produces a frightening hairbrush in the middle of the summer holidays, when everything feels fine.
The same delayed pattern follows a fever, a bout of flu, a general anaesthetic or a stretch of rapid weight loss. The NHS lists illness, stress, weight loss and iron deficiency among the causes of temporary hair loss, and the word doing the work there is temporary. Shedding of this kind usually settles within about three months and density catches up over the following six to nine.
What helps in the meantime is unglamorous: eat properly, sleep, keep washing normally, and handle hair gently while it recovers. What does not help is buying five products at once, because the shed was going to settle anyway and you will credit whichever bottle you opened last.
When should a teenager see a GP about hair loss?
Certain signs need an appointment rather than a shopping trip. Patches of bare scalp with smooth edges, a scalp that is red, scaly, flaking or sore, hair coming out in clumps, broken stubble in one defined area, or shedding that has gone on for more than six months. Tiredness or breathlessness alongside thinning also deserves a blood test.
The NHS advises seeing a GP to get an idea of what is causing hair loss before thinking about going to a commercial hair clinic, which is sound advice at any age and particularly for a teenager. Take photographs of the parting or the patch taken a few weeks apart, and mention anything else that has changed. The NHS also notes it is normal for puberty to start any time between the ages of 8 and 14, so a GP is the right person to ask about anything that seems out of step with that.
We do not run clinics and we cannot say what is happening on a particular scalp. 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.
Frequently asked questions: what else do people ask about hair loss in teenagers?
Is it normal for a teenager to lose hair every day?
Yes. Everyone releases hair as part of the ordinary cycle, and DermNet notes that losing up to 50 to 100 hairs a day is normal at any age. Teenagers often notice it for the first time because they are washing and styling their own hair and paying attention to it in a way they did not at ten.
Can exam stress really cause hair to fall out?
It can, with a delay that hides the connection. DermNet explains that after a shock to the system as many as 70 per cent of growing hairs can be pushed into the resting phase, and resting hairs are not released for about three months. So a difficult exam season in May shows up in the hairbrush in August.
Does dieting cause hair loss in teenagers?
Rapid weight loss is on the NHS list of causes of temporary hair loss, alongside illness, stress and iron deficiency. Teenage years combine fast growth with changing eating patterns, which is exactly when iron can run short. That is a GP conversation and a blood test, not a supplement bought on guesswork.
Are tight ponytails and braids really a problem?
Repeatedly, yes. DermNet traces traction alopecia to tension from tight chignons, cornrows, dreadlocks, weaves and braids, from extensions, and from chemical relaxers and rollers. It was first described in 1907 in people who wore tight ponytails. Loosening the style early matters, because prolonged traction can eventually become permanent.
Can a teenager start going bald?
Pattern hair loss can begin in the late teens, most often as a gradually receding hairline at the temples in boys or slow widening of the parting in girls. It is genetic and it is not caused by anything the teenager did. If a parent suspects it, a GP appointment is the right first step.
Should a teenager use a hair growth product?
No. We do not recommend selling growth products or supplements to anyone under 18 as a fix for hair changes, and a product is the wrong answer to a question nobody has asked a GP yet. Gentle everyday care that stops hair snapping is appropriate at any age; anything promising to fix hair loss is not.
What does hair loss in teenagers look like when it needs a GP?
Patches of bare scalp with smooth edges, a scalp that is red, scaly, flaking or sore, hair coming out in clumps rather than strands, broken stubble in one defined area, or any shedding that has gone on for more than six months. Sudden or patchy change always deserves an appointment.
Does washing hair less often reduce shedding?
No, it just moves it. Hairs that have already detached stay tangled in the rest of the hair until washing or brushing dislodges them, so washing twice a week produces an alarming handful and washing more often produces a few. The follicles are doing exactly the same thing either way.
What is the bottom line on hair loss in teenagers?
Hair loss in teenagers is usually breakage or a temporary shed rather than anything happening at the follicle, and both respond to time and gentler handling rather than to products making big promises. Check the end of a lost hair first: blunt and short means the styling routine, a pale bulb on a full-length strand means the cycle.
Loosen the styles, turn the heat down, use a protective spray, condition every wash, and give a shedding episode six months before drawing conclusions. Take patchy loss, a sore scalp or anything sudden to a GP straight away, and leave growth products and supplements out of it entirely at this age.
If one thing changes this week, make it the heat protection spray before the straighteners, because heat damage is the part of this that is entirely avoidable.
Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary.
