Telogen Effluvium
Sudden or Excessive Hair Shedding
Telogen effluvium is a form of diffuse hair shedding caused by disruption to the normal hair-growth cycle.
Rather than producing a distinct bald patch, it typically causes increased shedding from across the scalp and a noticeable reduction in overall hair volume.
For many people, the change can feel sudden and alarming — particularly when significantly more hair than usual begins appearing during washing, brushing or styling.
Why Does Telogen Effluvium Happen?
Hair naturally cycles through periods of growth and shedding.
With telogen effluvium, a larger proportion of follicles move into the resting and shedding phase at the same time. The increased shedding commonly becomes noticeable around three months after a triggering event.
Possible triggers include:
- Significant illness or fever
- Surgery
- Childbirth
- Major physical or emotional stress
- Significant weight loss or restrictive dieting
- Starting certain medications
- Hormonal changes
- Stopping hormonal medication
- Significant scalp disease
In some cases, no clear trigger can be identified.
What Does Telogen Effluvium Look Like?
The most characteristic feature is diffuse shedding rather than loss from one particular area.
You may notice:
- More hair than usual when washing
- Increased hair on a brush or comb
- Hair on clothing or bedding
- A reduction in ponytail thickness
- Reduced overall volume
- Greater visibility of the scalp in more severe cases
The onset is often relatively sudden.
Is Telogen Effluvium Permanent?
In many cases, telogen effluvium improves without a specific hair-growth treatment once the triggering event has passed or an underlying factor has been addressed.
BAD guidance states that the shedding phase commonly lasts around three to six months, although it can take considerably longer for new growth to restore the previous appearance and volume of the hair. Telogen effluvium lasting longer than six months is generally described as chronic.
It can also recur if an underlying trigger remains present.
Why Assessment Matters
Not all diffuse shedding is telogen effluvium.
Female or male pattern hair loss can produce thinning that appears similar, and telogen effluvium can sometimes occur alongside pattern hair loss.
Assessment is therefore useful when shedding is severe, persistent, recurrent or unexplained.
At YT Medical, we may consider:
- When the shedding began
- Possible events in the preceding months
- Illness or surgery
- Stress
- Dietary or weight changes
- Medication
- Hormonal changes
- The pattern of thinning
- Hair and scalp appearance
Where appropriate, blood testing can help investigate possible contributing factors such as iron deficiency or thyroid abnormalities.
Does Telogen Effluvium Need Treatment?
Telogen effluvium itself will often recover naturally, and medication does not necessarily make this process occur more quickly.
The priority is therefore usually to identify and, where possible, address an underlying trigger while establishing whether another type of hair loss is also present.
This is why YT Medical does not automatically recommend a hair-restoration procedure simply because somebody is experiencing increased shedding.
Book a Hair Shedding Assessment
If you have noticed sudden or persistent excessive shedding, a consultation can help establish whether the pattern is consistent with telogen effluvium and whether further investigation may be appropriate.