Telogen effluvium: sudden shedding after illness or stress

In short: telogen effluvium (TE) is sudden, all-over hair shedding that starts about 2–3 months after a shock to the body, such as a high fever, typhoid, dengue, COVID, surgery, delivery, crash dieting or major stress. It looks alarming, but it is usually temporary: most people see it settle within about 6 months, and hair regrows. You won't go bald from TE alone.

Why it happens

Normally, most hairs are growing, and a small share are resting before they fall. A major trigger pushes many hairs into the resting (telogen) phase at once. About 2–3 months later, they all shed together. New hairs are already growing underneath.

Common triggers (look back 2–4 months)

High fever or infection: typhoid, dengue, malaria, COVID, other viral fevers
Delivery → Hair fall after delivery
Surgery, hospital stays, major injury
Crash dieting or rapid weight loss; very low protein intake
Major emotional stress: bereavement, exams, job loss
Medicines: starting or stopping the contraceptive pill, some acne, blood-pressure, blood-thinning or mood medicines (don't stop any without your doctor)
Thyroid changes, low iron → Thyroid · Iron

Signs it's TE

Lots of full-length hairs falling, in the shower, on the pillow, in the comb
Shed hairs often have a small white bulb at the root end
All over, not in patches or one area
Ponytail feels thinner, but there are no bald spots
A gentle pull on a group of hairs releases several hairs easily (doctors call this the pull test)

How long does it last?

Type	Duration	Typical course
Acute TE	Under 6 months	Shedding slows within weeks to months; regrowth visible by 6–12 months
Chronic TE	Over 6 months, sometimes on and off for years	More common in women aged 30–60; check for ongoing triggers

Short new hairs along the hairline and parting are a good sign of recovery.

TE or pattern hair loss?

	Telogen effluvium	Pattern hair loss (men / women)
Start	Sudden, after a trigger	Gradual
Pattern	All over	Hairline, crown, or parting
Main complaint	Shedding	Thinning
Course	Usually recovers	Progresses without treatment

They often overlap. TE can make hidden pattern loss noticeable. If hair doesn't recover after 6–12 months, see a dermatologist.

What helps

Find and remove the trigger if it's ongoing (diet, medicine, thyroid, iron).
Get basic tests if shedding persists: CBC, ferritin, TSH, vitamin D.
Eat enough protein and calories. Avoid crash diets during recovery.
Be gentle with your hair: loose styles, less heat, fewer chemical treatments.
Give it time. Most acute TE needs no medicine.
Chronic TE: a dermatologist may suggest minoxidil to support regrowth.

What doesn't help: expensive anti-hair-fall shampoos, biotin (unless deficient) and frequent product switching. None of these change the shedding cycle.

FAQs

Will my hair grow back after typhoid or dengue? Usually yes. Shedding after fever is classic acute TE, and hair typically recovers over the following months.

Can stress alone cause it? Yes. A major stressful event can trigger TE. → Stress hair loss

Should I cut my hair short? It won't change the shedding, but shorter hair can look fuller while it regrows.

See a doctor soon if you have: round bald patches that appear suddenly · hair coming out in clumps · redness, pain, pus, scaling or scarring on the scalp · hair loss with fever, weight loss, irregular periods, acne or new facial hair · eyebrow or eyelash loss · hair loss in a child.

Sources

Headington JT. Telogen effluvium: new concepts and review. Arch Dermatol. 1993;129:356–63.

Medical review pending: not yet reviewed by a dermatologist. Medical disclaimer