Hair Health . Symptoms guide
Thinning at the Crown: Hormonal and Nutritional Causes
Visible scalp at the crown is the most common pattern of androgenetic alopecia. In men it usually means DHT-driven miniaturisation. In women a similar pattern can be androgenetic (female pattern hair loss) but is more often combined with iron deficiency, thyroid imbalance or perimenopausal hormonal change. Targeted bloodwork separates these so the treatment plan matches the cause.
This patient information is being clinically reviewed by our team. The factual content draws on UK guidance (NHS, NICE, British Association of Dermatologists, British Society for Sexual Medicine where cited).
What this might be
- Androgenetic alopecia. In men: classic crown thinning. In women: a Christmas-tree pattern of widening on the central scalp.
- Iron deficiency. Ferritin under 70 ng/mL is enough to slow follicle cycling even with normal haemoglobin.
- Thyroid dysfunction. TSH outside reference range affects the whole scalp diffusely; the crown often shows it first.
- Perimenopausal hormonal shift. Falling oestrogen unmasks androgen effects, accelerating thinning in genetically susceptible women.
Common features that suggest this
- Wider part line than 12 months ago
- Visible scalp at the crown under bright light
- Reduced ponytail thickness
- Slower hair regrowth at trim points
Recommended tests
Same-day appointments at our Harley Street clinic, results clinician-reviewed.
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Testing advice
Book a morning slot for accurate hormone reading. For women, days 2 to 5 of the cycle give the most interpretable oestrogen and androgen baseline.
Common questions
Is crown thinning the same in men and women?
The underlying biology is similar (androgen-driven miniaturisation) but women rarely lose hair as completely. Female-pattern thinning preserves the front hair line. Combined hormone testing is more useful in women because oestrogen, thyroid and androgens interact.
What if my DHT is normal but I am still thinning?
Scalp sensitivity to DHT matters more than absolute blood levels. Treatment decisions weigh history, examination and bloodwork together, not bloodwork alone.