What it is
Progressive thinning and loss of hair, which may be temporary (reversible) or permanent depending on the cause.
Progressive thinning and loss of hair, which may be temporary (reversible) or permanent depending on the cause.

At a glance
What it is
Progressive thinning and loss of hair, which may be temporary (reversible) or permanent depending on the cause.
Commonly experienced as
Evidence context
Emerging evidenceSee the evidence snapshotContext
Loss of hair encompasses the full spectrum from gradual thinning (androgenetic alopecia) to sudden shedding (telogen effluvium) to patchy loss (alopecia areata) to complete scalp and body hair loss (alopecia totalis/universalis). Androgenetic alopecia (male and female pattern hair loss) is the most prevalent permanent cause, driven by genetic sensitivity of follicles to dihydrotestosterone (DHT). Telogen effluvium is diffuse, temporary loss occurring 2–4 months after a physical or psychological stressor (illness, childbirth, surgery, crash dieting, severe stress) as follicles simultaneously enter the resting phase — this is reversible. Alopecia areata is an autoimmune condition producing patchy loss. The distress of hair loss is significant and often underestimated by clinicians.
The Evidence
What research says about the causes, reversibility, and management options for hair loss across different types.
Hair loss is well-studied, but cause determines outcome
The evidence base for hair loss varies significantly by type. Androgenetic alopecia and telogen effluvium are well-researched, with established interventions. Rarer forms like alopecia areata have strong evidence for specific treatments but remain harder to manage long-term.
Seek prompt care if hair loss is accompanied by a rapidly spreading rash with fever, a skin lesion changing shape or colour quickly, a non-healing wound, or signs of skin infection such as increasing redness, warmth, swelling, or pus. These may indicate conditions requiring timely professional assessment.
Minoxidil has strong evidence for androgenetic alopecia in both men and women. Correcting confirmed iron deficiency or thyroid dysfunction has strong evidence for reversing associated shedding. Immunotherapy approaches have strong evidence for alopecia areata. Many complementary approaches have limited or preliminary evidence only.
Androgenetic alopecia is the most common permanent form, driven by follicle sensitivity to DHT. Telogen effluvium is diffuse, temporary shedding triggered by stressors such as illness, childbirth, or nutritional deficiency, typically reversing within months. Alopecia areata is autoimmune and patchy. Identifying the type is essential before considering any management approach.
Medical options include topical minoxidil, hormonal therapies, and immunotherapy for autoimmune types. Nutritional assessment — particularly iron, ferritin, zinc, and thyroid markers — is a practical first step for diffuse shedding. Stress reduction and adequate protein intake are commonly recommended supportive measures, though evidence for these as standalone interventions is limited.
A dermatologist or GP can assess hair loss type through examination and targeted blood tests. This matters because the same visible symptom — thinning hair — can have very different causes requiring different responses. Self-managing without understanding the cause risks missing a correctable underlying factor or delaying effective care.
Numerous supplements, topical oils, and scalp treatments are marketed with inflated outcome claims. Evidence for most is preliminary, small-scale, or industry-funded. Platelet-rich plasma (PRP) therapy shows some promise but evidence remains inconsistent. The psychological impact of hair loss is significant and often under-addressed — emotional wellbeing support is a legitimate part of holistic care.
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