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Understanding Hair Loss: Causes, Types, and What They Mean for Treatment

Hair loss is not a single condition. It is a symptom that can arise from several different biological processes – and the cause determines what, if anything, can be done about it. Understanding why hair loss occurs is the first step toward evaluating which treatments are appropriate and what outcomes are realistic.

Androgenetic Alopecia - The Most Common Cause

Androgenetic alopecia (AGA) is the medical name for pattern hair loss – the most common form in both men and women. It is driven by a genetic sensitivity to dihydrotestosterone (DHT), a potent androgen derived from testosterone through the action of 5-alpha reductase.

In genetically susceptible individuals, DHT binds to receptors in the hair follicle and triggers miniaturization: the follicle progressively produces thinner, shorter, and less pigmented hairs over successive growth cycles, eventually becoming inactive. This occurs selectively – the hairline and crown in men, the central scalp in women – while follicles at the back and sides of the scalp remain resistant. That resistance is what makes surgical hair restoration possible: donor follicles retain their DHT-resistant characteristics even after transplantation.

The Norwood Scale (Men)

Androgenetic alopecia in men is classified using the Norwood-Hamilton scale, a seven-stage system describing progression from early temporal recession to advanced vertex and crown loss. Norwood staging is one factor that guides treatment recommendations - not because every stage has a predetermined answer, but because it provides a framework for where a patient currently is and where loss may progress.

The Ludwig Scale (Women)

In women, androgenetic alopecia typically presents as diffuse thinning over the central scalp rather than the hairline recession seen in men. The Ludwig scale classifies female pattern hair loss across three stages. Women are also susceptible to other types of hair loss that can mimic or occur alongside AGA, which is why thorough evaluation is particularly important in female patients.

Telogen Effluvium

Telogen effluvium is diffuse, temporary shedding that occurs when a large proportion of hairs simultaneously enter the telogen (resting/shedding) phase. It is typically triggered by a systemic stressor:
Illness
Surgery
Significant Weight Change
Postpartum Hormonal Shifts
Nutritional Deficiency
Severe Psychological Stress
It usually resolves as the underlying trigger resolves and does not cause permanent follicle loss. It can be alarming in its presentation and is sometimes confused with AGA; an evaluation can differentiate between the two.

Traction Alopecia

Traction alopecia results from prolonged mechanical tension on the hair follicle – from tight hairstyles, extensions, or similar practices. Over time, this tension damages and ultimately destroys the follicle, creating a pattern of hair loss along the hairline and temples.
Early-Stage
May be reversible with removal of the causative tension.
Advanced
May require restoration.

Alopecia Areata

Alopecia areata is an autoimmune condition in which the immune system attacks the hair follicle, producing distinct circular patches of hair loss. It can affect any hair-bearing area and ranges from isolated patches to complete scalp or body hair loss. Treatment approaches for alopecia areata are distinct from those for androgenetic alopecia and require specialist evaluation.

Why Accurate Diagnosis Matters

The treatment appropriate for androgenetic alopecia is not appropriate for telogen effluvium. The approach to traction alopecia differs from the approach to alopecia areata. Before any treatment is recommended at Sage Hair Clinic, Dr. Patel conducts an evaluation to understand the type and cause of each patient’s hair loss.

Because the right answer starts with the right diagnosis.
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