Hair Fall: Telling Telogen Effluvium Apart from Pattern Baldness
Hair loss is one of the most common reasons people buy treatments they do not need. The single most useful step is establishing which of two very different patterns you have, because almost everything else follows from that.
Normal shedding first
Each hair follicle cycles independently through a long growth phase, a short transition and a resting phase, after which the hair is shed. Losing 50 to 100 hairs a day is normal, and more on hair-wash days simply because shed hairs that were already loose come away together. Seasonal variation is real, with increased shedding often reported in late monsoon and autumn.
Telogen effluvium: sudden, diffuse shedding
A stressor pushes an abnormally large number of follicles into the resting phase simultaneously. Because the resting phase lasts around three months, the shedding begins about two to three months after the trigger, which is why people usually attribute it to the wrong cause.
Features:
- Diffuse shedding across the whole scalp, not a defined pattern
- Handfuls of hair while washing or combing, hair on the pillow and bathroom floor
- Reduced overall density and ponytail thickness, but no bald patches and no visible scalp shining through in one specific area
- Shed hairs have a small white bulb at the root and are full-length
- It is usually self-limiting, with recovery over six to twelve months once the trigger is removed
Common triggers:
- Fever or significant infection, including dengue, typhoid, COVID-19 and enteric fever
- Major surgery or general anaesthesia
- Childbirth, typically two to four months postpartum
- Rapid weight loss, crash dieting or very low protein intake
- Iron deficiency, with ferritin below about 30 ng/mL
- Vitamin D deficiency and zinc deficiency
- Thyroid disease, both under and overactive
- Severe psychological stress or bereavement
- Starting or stopping medication: retinoids, anticoagulants, beta blockers, some antidepressants, antithyroid drugs, anticonvulsants, hormonal contraception changes
- Uncontrolled diabetes
- Post-bariatric surgery malabsorption
Androgenetic alopecia: slow, patterned thinning
This is genetically determined sensitivity of follicles to dihydrotestosterone, which progressively miniaturises them. Hairs become finer, shorter and lighter over years rather than falling in handfuls.
Features:
- In men, receding temples and a thinning crown, with the back and sides preserved
- In women, widening of the central parting and diffuse thinning over the top of the scalp, usually with the frontal hairline preserved
- Gradual onset over years, with variation in hair calibre across the scalp
- Family history in either parent
- The scalp becomes visible in specific zones rather than uniformly
This is progressive without treatment, and the follicles that have been lost for years cannot be recovered, which is why early treatment matters far more than intensive treatment.
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Other patterns not to confuse
- Alopecia areata: well-defined, smooth, completely bald round patches appearing over weeks, sometimes with pitted nails. Autoimmune, and treated differently
- Traction alopecia: loss along the hairline or wherever hair is pulled tight, from tight braids, buns or extensions. Reversible early, permanent if prolonged
- Tinea capitis: scaly patches with broken hairs, itching, more common in children, and needs oral antifungal treatment
- Scarring alopecias such as lichen planopilaris and frontal fibrosing alopecia: loss of follicle openings, redness or scaling at the margins, sometimes pain or burning. These are urgent because the loss is permanent, and they need prompt dermatological assessment
- Trichotillomania: hairs of varying broken lengths in an irregular area
- Secondary syphilis, lupus and severe nutritional deficiency can all produce diffuse loss
Sensible investigation
Useful tests when shedding is significant or persistent:
- Complete blood count
- Serum ferritin, and iron studies if needed
- Thyroid function
- Vitamin D and vitamin B12
- Blood sugar or HbA1c
- In women with irregular periods, acne or hirsutism, androgen levels and a PCOS assessment
- Zinc where diet is restricted
A clinician may also do a gentle pull test and a dermatoscopic examination, which distinguishes the varied hair calibre of pattern loss from the uniform calibre of effluvium, and identifies scarring types.
Note that hair mineral analysis, and most “hair test” panels sold commercially, have no diagnostic value.
Treatment by diagnosis
Telogen effluvium. Correct the cause: treat iron and vitamin deficiency, restore adequate protein and calories, manage thyroid disease, review medication with your doctor, and allow time. Minoxidil is sometimes used to speed regrowth. No topical product shortens the process if the underlying deficiency persists.
Androgenetic alopecia. The treatments with real evidence are topical minoxidil, which must be continued indefinitely and often causes a temporary increase in shedding in the first four to six weeks, and oral finasteride or dutasteride in men, with sexual side effects in a small percentage and a discussion needed about persistence. In women, options include minoxidil, spironolactone and treatment of any underlying PCOS. Low-level laser devices have modest supporting evidence. Platelet-rich plasma has mixed evidence and is expensive. Hair transplantation is effective for established loss, and results depend heavily on continued medical treatment to protect the remaining native hair.
Expect any treatment to need four to six months before its effect can be judged, and photographs under consistent lighting are more reliable than impressions.
What does not work
Oil massage does not prevent genetic hair loss. Onion juice, garlic, and most herbal and ayurvedic hair oils have negligible evidence. Biotin supplements help only genuine biotin deficiency, which is rare, and can interfere with thyroid and cardiac blood tests. Avoiding hair washing does not reduce loss and worsens scalp health. “DHT-blocking” shampoos have no meaningful effect at the concentrations and contact times involved.
When to see a dermatologist promptly
Bald patches, scalp pain, burning, redness or scaling, loss of visible follicle openings, rapid loss over weeks, loss with other symptoms such as weight change or menstrual irregularity, or loss in a child.
This is general information. Correct treatment depends on the correct diagnosis, and that is worth one dermatology consultation before spending on products.