What Causes Telogen Effluvium? Triggers, Timeline & Recovery
Telogen effluvium is a temporary type of hair loss where a shock to the body pushes far more hairs than usual into the shedding phase, so you suddenly notice handfuls of hair on your pillow, in the shower or on your brush. The good news: it is almost always temporary. Once the trigger, whether stress, illness, childbirth or a crash diet, has passed, your hair usually grows back on its own over several months. Here is what causes it, how long it lasts, and how to support your recovery.
Key takeaways
- Telogen effluvium is temporary, diffuse shedding triggered by a shock to the body, not permanent baldness.
- Common triggers include stress, childbirth, illness or high fever, surgery, crash dieting and iron or thyroid problems.
- Shedding usually starts 6 to 12 weeks after the trigger and settles within 3 to 6 months.
- Hair typically regrows once the trigger is resolved, address the cause, eat well and be gentle.
- See a GP to check for treatable triggers like low iron or a thyroid problem.
What is telogen effluvium?
Your hair grows in a cycle: each strand grows for a few years (the anagen phase), then rests and sheds (the telogen phase) so a new one can grow. At any time it is completely normal to lose 50 to 100 hairs a day. Telogen effluvium disrupts this balance, pushing a much larger share of follicles into the resting phase at once, so you can shed 300 or more hairs a day. The result is diffuse thinning all over, rather than the distinct bald patches you see with some other conditions.
What causes telogen effluvium?
Telogen effluvium affects both women and men, and it is the body's response to a significant disturbance. Common triggers include:
- Significant stress or emotional trauma, such as a bereavement.
- Childbirth (postpartum shedding is a classic, very common form).
- Illness or a high fever, including infections such as COVID-19.
- Surgery or a major physical shock to the body.
- Crash dieting or rapid weight loss, which starves the hair of nutrients.
- Iron deficiency and a poor diet.
- Thyroid conditions (both underactive and overactive).
- Certain medications, or coming off the contraceptive pill.
Because shedding usually appears 6 to 12 weeks after the trigger, the cause is often something that happened a couple of months earlier. If you are trying to work out your trigger, look back over the previous three months.
Telogen effluvium triggers at a glance
| Trigger type | Examples | What helps |
|---|---|---|
| Emotional | Stress, bereavement, burnout | Manage stress, time, support |
| Physical | Childbirth, illness, fever, surgery | Recover, rest, be patient |
| Nutritional | Crash diet, low iron, poor diet | Balanced diet, GP blood test |
| Medical / hormonal | Thyroid, medications, stopping the pill | See a GP to review |
How long does telogen effluvium last?
The shedding phase of telogen effluvium usually lasts around 3 to 6 months, which is the natural length of the telogen phase, after which hair begins to grow again. Because a new strand then has to grow out, it can take several more months for your hair to look back to its old thickness, especially if your hair is long. Patience really is part of the treatment here.
Acute vs chronic telogen effluvium
Acute telogen effluvium recovers within about six months and is by far the most common type, a one-off response to a single trigger. Chronic telogen effluvium lasts longer than six months or keeps coming back, usually because the trigger, such as ongoing stress, an untreated thyroid problem or a persistent deficiency, has not been resolved. The reassuring part: even chronic telogen effluvium is generally reversible, and hair usually returns to normal once the underlying cause is addressed.
When should you see a doctor?
Telogen effluvium often settles by itself, but it is well worth seeing your GP, because several of its triggers are treatable. A GP can check your iron (ferritin) levels and thyroid with a simple blood test, review any medications, and rule out other causes of hair loss. See a doctor if your shedding lasts beyond six months, comes with other symptoms (tiredness, weight change), or you notice distinct bald patches rather than diffuse thinning, as that may point to a different condition.
How to support your hair through telogen effluvium
You cannot force the cycle to speed up, but you can give your hair the best possible conditions to recover.
1. Address the trigger
This is the most important step. Manage stress, allow time to recover from illness or childbirth, avoid crash diets, and work with your GP on any thyroid or deficiency issue.
2. Eat for healthy hair
Hair is hungry for nutrients. A balanced diet with enough protein, iron, zinc and the B vitamins gives your follicles what they need to rebuild.
GrowPro Hair Growth Gummies
Because nutritional gaps are a common trigger, a daily top-up can help. GrowPro gummies provide biotin and zinc, which contribute to the maintenance of normal hair, alongside a varied diet. They support your nutrition, they are not a treatment for telogen effluvium, and if you suspect a deficiency, ask your GP for a blood test.
Shop GrowPro Gummies3. Be gentle and support the look of fuller hair
While you wait for regrowth, treat your hair kindly: go easy on heat, avoid tight styles, and use a gentle shampoo that keeps your scalp comfortable and your hair looking its fullest.
Grow Me® Hair Growth Shampoo
A gentle, sulphate-free shampoo with biotin, caffeine, rosemary and niacinamide. It cleanses without stripping and supports a comfortable scalp and the look of fuller, thicker-feeling hair as your regrowth comes through, a kind everyday base while you recover.
Shop Grow Me ShampooWatermans is a UK family business that has sold over 5 million bottles since 2012. The range is vegan and cruelty-free.
Common myths about telogen effluvium
- "I am going bald." Very unlikely. Telogen effluvium is a temporary thinning, not the patterned, permanent loss of male or female pattern baldness.
- "The shedding will never stop." It almost always does, once the trigger passes and the cycle resets.
- "A shampoo will cure it." No product treats telogen effluvium, resolving the trigger and good nutrition do. Products simply support healthier-looking hair.
Frequently asked questions
Is telogen effluvium permanent?
No. It is a temporary form of shedding, and hair usually regrows once the trigger is resolved.
How long does telogen effluvium last?
The shedding phase typically lasts 3 to 6 months, then hair starts to regrow, though it takes longer to look fully back to normal.
Will my hair grow back after telogen effluvium?
In most cases yes. Addressing the trigger and eating well give your hair the best chance to recover.
What triggers telogen effluvium?
Stress, childbirth, illness or fever, surgery, crash dieting, iron deficiency, thyroid problems and certain medications are all common triggers.
Can stress really cause hair to fall out?
Yes. Significant stress can push extra hairs into the shedding phase, with the loss showing up a couple of months later.
Should I see a doctor about telogen effluvium?
It is a good idea, so a GP can check for treatable causes like low iron or a thyroid problem, especially if it lasts beyond six months.
Do supplements help telogen effluvium?
Correcting a genuine deficiency helps, and a balanced diet or a hair supplement supports your nutrition, but supplements are not a cure. Ask your GP if you suspect a deficiency.
How is telogen effluvium different from pattern baldness?
Telogen effluvium is diffuse, temporary shedding from a trigger, whereas pattern baldness is gradual, patterned and permanent.
Telogen effluvium can be alarming, but it is one of the most temporary and treatable forms of hair loss. Find and address your trigger, nourish your body, be gentle with your hair, and give it time. For related reading, see our guides on why your hair might be thinning and hair loss in children.
