Condition Guide
Telogen Effluvium
A direct answer: telogen effluvium is excessive, diffuse hair shedding (200–400 hairs/day) that occurs 2–4 months after a significant physical, hormonal, or emotional stressor pushes large numbers of follicles simultaneously into the resting phase.
Reviewed by the Hair Scripts Medical Review Board · Last updated July 2026
Common triggers
Hormonal
Postpartum (2–4 months after delivery), stopping hormonal birth control, perimenopause, PCOS fluctuation, thyroid dysfunction (both hypo and hyper)
Physical stress
Major surgery, high fever, severe infection, significant blood loss, crash dieting / rapid weight loss (>15 lbs in 3 months)
Nutritional
Low ferritin (iron stores) — the most common reversible cause; Vitamin D deficiency; B12 deficiency; zinc deficiency
Psychological stress
Prolonged or acute severe stress. Mechanism: cortisol elevation disrupts the hair cycle via CRH receptors in follicles
Medications
Retinoids (isotretinoin), anticoagulants, beta-blockers, antidepressants, chemotherapy agents
Timeline of telogen effluvium
Triggering stressor occurs (illness, delivery, crash diet, etc.)
Follicles shift into telogen (resting) phase — no visible change yet
Shedding begins — often described as 'coming out in clumps' or noticed dramatically in the shower
Acute TE typically begins resolving if trigger is removed; chronic TE continues if trigger persists
Full regrowth in most acute cases; partial regrowth if underlying androgenetic alopecia is also present
Telogen effluvium vs androgenetic alopecia
These two conditions frequently coexist. TE accelerates the visible impact of underlying AGA by stripping the "density buffer" that was masking genetic loss.
| Feature | Telogen Effluvium | Androgenetic Alopecia |
|---|---|---|
| Onset | 2–4 months after trigger | Gradual over years |
| Pattern | Diffuse — all over scalp | Patterned — crown/temples |
| Shedding volume | 200–400+/day | Gradual thinning, less acute shedding |
| Reversibility | Often fully reversible | Treatable but not fully reversible at advanced stages |
| Treatment | Address trigger; minoxidil supports regrowth | Minoxidil + finasteride/dutasteride long-term |
Frequently asked questions
Does telogen effluvium grow back?
In most acute cases, yes — within 6–12 months after the trigger resolves. Chronic telogen effluvium or TE layered on AGA may require active treatment to fully recover.
What is the most common reversible cause?
Low ferritin (iron stores). Ferritin below 40 ng/mL is commonly associated with telogen effluvium even if hemoglobin is normal. Ask your doctor to check ferritin specifically — a standard CBC often misses this.
Can minoxidil help telogen effluvium?
Yes. Minoxidil can extend the anagen phase and speed regrowth in TE. It does not address the underlying trigger, but it shortens recovery time and is particularly useful when TE is exposing underlying AGA.
Should I see a dermatologist for telogen effluvium?
For acute TE with a clear trigger, many cases resolve on their own. If shedding persists beyond 6 months, or if there's no obvious trigger, a dermatologist can evaluate for chronic TE, AGA, alopecia areata, or thyroid/hormonal causes.
Hair Scripts evaluates both TE and AGA
Your intake captures both conditions. Your provider prescribes the right approach — whether that's addressing the trigger, supporting regrowth, or both.
For informational purposes only. Not a substitute for professional medical advice.