TEMPORARY DIFFUSE HAIR LOSS

Telogen Effluvium: diffuse hair loss explained

Telogen effluvium is diffuse hair loss: you shed more hairs than usual across the scalp. Read how to recognise it, which triggers may play a role and what to expect from recovery.

Written by the TRIX Basic team

Medically reviewed by Prof. dr. Sherief Janmohamed · Dermatologist

Telogen Effluvium: diffuse hair loss explained

Briefly summarized

  • Telogen effluvium causes diffuse hair loss over a large part of the scalp.
  • Hair loss often only becomes visible two to three months after a physical or emotional trigger.
  • Possible triggers include illness, fever, surgery, childbirth, severe stress, rapid weight loss, or nutritional deficiencies.
  • The hair follicles remain present, meaning recovery is usually possible as soon as the trigger has passed or is addressed.
Illustration: What happens with telogen effluvium?

THE HAIR CYCLE

What happens with telogen effluvium?

Hair grows in a cycle of growth, transition, rest, and shedding. With telogen effluvium, more hairs than normal temporarily move from the growth phase into the resting phase.

Increased shedding usually becomes noticeable only two to three months after the triggering event. The hair follicles are not destroyed and can produce hair again once the cycle recovers.

POSSIBLE CAUSES

What triggers can cause telogen effluvium?

Telogen effluvium can develop after the body has experienced physical or emotional stress. Examples include a high fever, an infection, surgery, childbirth, severe stress, rapid weight loss or a strict diet. Certain medicines and nutritional deficiencies may also play a role.

It is not always possible to identify one clear trigger. Timing matters: hair loss often begins only weeks to months after the triggering event.

Learn more about three possible triggers: thyroid problems, iron deficiency and medicines.
What triggers can cause telogen effluvium?
How can you recognise telogen effluvium?

RECOGNIZABLE SIGNALS

How can you recognise telogen effluvium?

The hair loss is usually diffuse: you lose more hair than normal across a large part of the scalp. This may be noticeable in the shower, on your pillow, in your brush, or while washing and styling your hair.

Clearly defined bald patches generally do not develop. The hair may feel less full overall, while the hairline usually remains intact. A widening part or a distinct pattern may also indicate another form of hair loss.

 Read about sudden hair loss

DURATION AND RECOVERY

How is the recovery going?

The increased hair shedding in acute telogen effluvium often lasts for several months. After that, the shedding usually gradually decreases, provided the trigger has passed or is addressed.

New hairs need time to become visibly longer and fuller. As a result, restoring hair density can take longer than stopping the shedding. When hair loss persists for more than six months, it is referred to as chronic telogen effluvium, and further evaluation is advisable.

 Read about chronic telogen effluvium
How is the recovery going?
What support is available?

POSSIBLE APPROACH

What support is available?

The most important step is to determine whether a possible trigger is present and whether it is still having an effect. This may include recovery after an illness, prolonged stress, a significantly changed diet, blood loss, or the use of certain medications.

A balanced diet and gentle hair care support the overall condition of the hair. Supplements are not a treatment for every cause and are mainly useful when relevant nutrients are insufficient. If symptoms persist or have no clear explanation, first seek a professional assessment of the appropriate approach.

Important to know

Telogen effluvium is usually temporary, but not every form of diffuse hair loss has the same cause. Have the hair loss professionally assessed if it persists for longer than six months, worsens rapidly, becomes patchy, or is accompanied by itching, redness, scaling, pain, or other physical symptoms.

Read more about hair loss

What causes telogen effluvium?

CAUSES AND TRIGGERS

What causes telogen effluvium?

Learn which physical, hormonal, emotional, and nutritional factors can trigger temporary diffuse hair loss.

 Read more →
How long does telogen effluvium last?

DURATION AND RECOVERY

How long does telogen effluvium last?

Read when increased shedding usually begins, how long it can last, and why visible regrowth takes time.

 Read more →
Androgenetic alopecia or telogen effluvium?

RECOGNISE DIFFERENCES

Androgenetic alopecia or telogen effluvium?

Compare temporary diffuse hair loss with gradual hereditary hair thinning and discover which characteristics often differ.

 Read more →

Questions about telogen effluvium

Is telogen effluvium temporary?

Often. In acute telogen effluvium, hair loss usually decreases once the triggering factor has passed or is addressed. The pace of recovery varies from person to person, and visible restoration of hair density takes longer than stopping the hair loss.
When does hair loss begin after a trigger?

The increased hair loss often only becomes noticeable two to three months after a physical or emotional trigger. As a result, the connection with, for example, an illness, fever, surgery, childbirth, or severe stress is not always immediately clear.
How long does telogen effluvium last?

In the acute form, increased shedding often lasts for several months. It can then take several more months for new hair to grow to sufficient length and for hair density to visibly recover. Hair loss lasting longer than six months requires professional assessment.
Can stress cause telogen effluvium?

Severe or prolonged stress can be a trigger, but diffuse hair loss does not always have a single cause. Illness, fever, hormonal changes, rapid weight loss, nutritional deficiencies, or medication can also play a role.
Can telogen effluvium occur after childbirth?

Yes. Due to hormonal changes, relatively many hairs can enter the resting and shedding phase at the same time after childbirth. Hair loss usually becomes noticeable a few months after delivery and generally resolves gradually.
When is a professional assessment advisable?

Have hair loss assessed if it persists for more than six months, worsens rapidly, occurs in patches, or is accompanied by itching, redness, flaking, or pain. Assessment is also advisable in cases of fatigue, unexplained weight loss, a significantly changed diet, or when the cause remains unclear.

Sources and medical background

FIND WHAT SUITS YOU

What support is suitable for diffuse hair loss?

The TRIX Hair Check helps you better understand your situation and shows which TRIX Basic products may be suitable for you. The Hair Check does not provide a medical diagnosis.
Start the Hair Check View TRIX Basic Beta