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Does stress cause hair loss?
Short answer
It can, but usually temporarily. A stressful event, illness, surgery or crash diet can push many hairs into their resting phase at once, and about 3 months later they shed. This is called telogen effluvium. The British Association of Dermatologists says shedding lasts around 3 to 6 months and usually gets completely better without treatment. Stress does not cause pattern hair loss, which is genetic and hormonal.
Key facts
- Telogen effluvium is widespread shedding that often starts about 3 months after a trigger, such as a stressful life event, illness, surgery, childbirth or marked weight loss.
- The shedding phase lasts about 3 to 6 months. It is called chronic if it lasts more than 6 months.
- The BAD says it usually gets completely better without treatment, and that medication does not speed regrowth.
- In 1 in 3 people no cause is found. Iron deficiency and thyroid problems should be ruled out with blood tests.
- Pattern hair loss is caused by genetic and hormonal factors, not stress, though telogen effluvium can occur alongside it.
How stress leads to shedding
Each hair follicle cycles through a growing phase, a short transition and a resting (telogen) phase before the hair falls out. Our entry on the hair growth cycle explains the phases. A major stress, physical or emotional, can move a large share of follicles into the resting phase at the same time. The British Association of Dermatologists (BAD) describes telogen effluvium as a condition where more hair than usual falls out, spread over the whole scalp rather than in patches, caused by a disruption to the normal hair cycle.
The delay is the confusing part. The BAD says shedding can start around 3 months after a trigger, so the event you remember may be long past when the hair starts to fall. Triggers it lists include childbirth, severe illness with high fever, stressful life events, surgery, marked weight loss or crash dieting, starting new medicines and stopping hormones such as the contraceptive pill.
How long it lasts, and does hair grow back?
The BAD says shedding lasts about 3 to 6 months, after which new hair grows, and that regaining normal volume can take many months. It states that telogen effluvium "usually gets completely better without any treatment", and that taking medication does not speed up regrowth. It is considered chronic if it lasts more than 6 months. For some people no cause is ever found (1 in 3, according to the BAD). The NHS likewise lists illness, stress, cancer treatment, weight loss and iron deficiency as causes of temporary hair loss, and says hair loss caused by a medical condition usually stops or grows back once you have recovered.
Our guides to telogen effluvium and postpartum hair loss cover the timeline in more detail.
Stress is not the cause of pattern hair loss
If your hair is thinning gradually at the temples, crown or parting, over years, that fits pattern hair loss, which the BAD says is caused by a combination of genetic and hormonal factors. Stress does not cause it, and it does not stop on its own the way telogen effluvium does. The two can happen together: the BAD notes that telogen effluvium can coexist with pattern hair loss or bring it to light earlier. If you are unsure which you have, see male pattern hair loss, diffuse thinning or female pattern hair loss.
What to do
See a GP if shedding does not get better, if it is heavy or sudden, or if you also have other symptoms. The BAD says a blood test can exclude other causes, such as low iron or thyroid problems, and that iron deficiency can make the condition recur. Do not start iron or biotin supplements without a test showing you need them; see does biotin help hair loss.
Look after the basics. The BAD advises gentle hair handling, limiting heat tools and harsh chemicals, avoiding tight hairstyles, stopping smoking and eating a balanced diet with enough iron and protein.
Look after yourself. Hair loss can be distressing in its own right. The NHS says a GP can discuss how hair loss is affecting your wellbeing. If stress or low mood is overwhelming, speak to your GP or NHS 111; in a crisis, call Samaritans free on 116 123, or go to A&E or call 999 if you feel at serious risk.
If you would like a GMC-registered doctor to look at your hair loss and tell you honestly whether it is telogen effluvium, pattern hair loss or something else, start the free online assessment.
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Start your free assessment →Related questions
How long after stress does hair fall out?
Often about 3 months. The BAD says telogen effluvium can occur around 3 months after a trigger, so the trigger may feel like a distant event.
Will hair grow back after stress hair loss?
Usually. The BAD says telogen effluvium usually gets completely better without any treatment, though it can take many months to regain normal volume.
How can I tell stress hair loss from pattern hair loss?
Stress shedding is spread over the whole scalp and starts relatively suddenly. Pattern hair loss is gradual and follows a pattern, such as receding temples or a widening parting. A doctor can tell them apart; the two can coexist.
Do I need a blood test for hair shedding?
A blood test can exclude other causes. The BAD notes it can check for causes of hair loss, and iron deficiency and thyroid problems are common ones to rule out. Speak to your GP.
Can hair loss itself cause stress?
Yes. Hair loss can affect self-esteem and mood. Talk to your GP if it is affecting your wellbeing, and call Samaritans on 116 123 at any time if you are struggling.
Sources
- British Association of Dermatologists: Telogen effluvium, patient information
- British Association of Dermatologists: Hair loss, female pattern (patient information leaflet, October 2024)
- NHS: Hair loss
Facts checked against these sources on 22 October 2026. This page is general information, not personal medical advice. Read our editorial policy.