Diffuse Hair Shedding
Telogen Effluvium: Causes, Symptoms & Recovery
Telogen effluvium is a common, non-scarring form of diffuse hair shedding that often appears a few months after illness, childbirth, surgery, major stress, rapid weight loss or another physiological trigger.
What is telogen effluvium?
Hair follicles cycle through growth and resting phases. In telogen effluvium, a larger-than-usual proportion of follicles enter the telogen, or resting, phase after a physiological or psychological stressor.
The follicles are not usually destroyed. New growth continues, but resting hairs are released in greater numbers, producing noticeable diffuse shedding.
Common triggers of telogen effluvium
Illness or fever
A significant acute illness, particularly one associated with high fever, can disrupt the normal hair cycle.
Childbirth
Hormonal and physiological changes after pregnancy can trigger postpartum shedding several weeks to months later.
Surgery or physical stress
Major surgery, trauma and other significant physiological stresses can shift follicles into telogen.
Weight loss or nutrition
Rapid weight loss, restrictive diets, inadequate protein and deficiencies such as iron deficiency can contribute.
Why does shedding start months later?
The delay is characteristic of telogen effluvium. After a trigger, affected follicles leave active growth and enter the resting phase. Telogen hairs remain in place for a period before new growth pushes them out.
As a result, increased hair fall is commonly noticed around two to four months after the triggering event. This delay can make the cause difficult to recognise unless you look back at recent illness, surgery, childbirth, stress, weight change or medication changes.
What does telogen effluvium look like?
Shedding is usually diffuse rather than forming one smooth bald patch. People may notice more hair while shampooing, brushing, on the pillow or around the home, followed by an overall reduction in volume.
The scalp usually does not show the inflammation or scarring seen in some other alopecias. Complete baldness is not typical of ordinary telogen effluvium.
Acute vs chronic telogen effluvium
Acute telogen effluvium follows a discrete trigger and commonly settles over several months. Hair shedding that continues beyond about six months is generally termed chronic telogen effluvium.
Persistent or fluctuating shedding warrants reassessment for ongoing triggers, nutritional or endocrine problems, medications and other diagnoses. Telogen effluvium can also reveal previously subtle pattern hair loss.
Postpartum hair shedding
Postpartum telogen effluvium is common. Pregnancy alters the proportion of hairs in the growth phase, and after delivery many follicles synchronously transition through the cycle, producing noticeable shedding later.
This is usually temporary. However, persistent reduced density may justify assessment because postpartum shedding can make underlying female pattern hair loss more noticeable.
Stress and telogen effluvium
Major psychological stress can act as a trigger, but persistent shedding should not automatically be attributed to everyday stress. A dermatologist considers the full history and looks for other contributors such as illness, diet, medications, thyroid disease and pattern hair loss.
For the broader distinction between normal shedding and a hair-loss disorder, read Hair Fall vs Hair Loss.
Iron, thyroid and nutritional factors
Iron deficiency, thyroid dysfunction and inadequate nutrition can contribute to diffuse shedding. Rapid weight loss and restrictive diets can also disturb the hair cycle.
How is telogen effluvium diagnosed?
Diagnosis is based on the timing and pattern of shedding, recent triggers and scalp examination. A hair-pull test may show increased shedding, and dermoscopy can help distinguish telogen effluvium from pattern hair loss or other disorders.
Blood tests may be selected to look for treatable contributors such as iron deficiency or thyroid disease. A scalp biopsy is rarely necessary but can be useful when the diagnosis remains uncertain.
Does telogen effluvium grow back?
In many acute cases, yes. Once the trigger has resolved, excessive shedding gradually decreases and new hairs continue growing. The scalp may take many months to look as full as before because hair grows slowly.
DermNet notes that shedding commonly tapers back toward normal over roughly six to nine months in many acute cases, although recovery can vary and may be incomplete when another hair-loss condition is also present.
How is telogen effluvium treated?
The main approach is to identify and correct the trigger where possible. This can include treating thyroid or scalp disease, correcting a documented nutritional deficiency, improving dietary adequacy or reviewing a potentially contributing medicine with the prescribing clinician.
Gentle hair handling is sensible while shedding is active. Avoid unnecessary high-dose supplements unless a deficiency or clinical need has been identified.
Telogen effluvium vs pattern hair loss
Telogen effluvium primarily causes excessive diffuse shedding, while androgenetic alopecia causes progressive follicle miniaturisation in a characteristic distribution. The two conditions can coexist.
Read Male Pattern Hair Loss and Female Pattern Hair Loss for the typical pattern presentations.
When should you see a dermatologist?
Arrange an assessment if shedding is severe or continues for months, visible density keeps declining, you develop distinct bald patches, or the scalp becomes painful, inflamed, heavily scaly or scarred. Evaluation is also useful when there is no obvious trigger.
For diagnosis and an individual plan, visit Hair Loss Treatment in Chennai.
Frequently asked questions
What is telogen effluvium?
It is a non-scarring form of diffuse hair shedding caused when more follicles than usual enter the resting phase of the hair cycle.
What triggers telogen effluvium?
Triggers can include significant illness or fever, surgery, childbirth, major stress, rapid weight loss, nutritional deficiency, thyroid disease and some medicines.
How long after a trigger does shedding start?
It commonly becomes noticeable around two to four months after the triggering event.
Does hair grow back?
In many acute cases, shedding settles after the trigger resolves and hair gradually regains density, although visible recovery takes months.
When is telogen effluvium considered chronic?
Shedding lasting longer than about six months is generally described as chronic and should be assessed for persistent triggers and other causes.
Visit us in OMR
Experiencing persistent diffuse hair shedding? Find the trigger.
Book a dermatologist consultation at Ram Skin Clinic in Thoraipakkam, Chennai.
#48, Second Floor, Flat E, Best Towers,Okkiampet, Thoraipakkam, OMR,
Chennai – 600097. Above Domino’s Pizza.
