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Hair fall in your 40s: causes and the tests that help

By Dr Anagha Karkhanis · 15 November 2026 · 4 min read

Noticing more hair on your pillow or a wider parting? Hair changes are common around menopause, and the cause can usually be found and treated.

Common causes

  • Hormonal change. Falling estrogen makes hair follicles more sensitive to androgens, so hair thins, especially at the crown.
  • Thyroid problems, which are more common in women in midlife.
  • Low iron (ferritin), particularly after years of heavy periods.
  • Low vitamin D or B12.
  • Stress, illness or crash dieting, which can cause sudden shedding two to three months later.

Useful tests

Blood count, ferritin, thyroid function, vitamin D and B12. Where relevant, tests for androgens or PCOS.

What helps

Correcting any deficiency is the first step. Medicated scalp treatments, good nutrition with enough protein and, for some women, HRT can help. A dermatologist may advise on procedures where needed. Most treatments take three to six months to show results, so patience matters.

This article is general information and not a substitute for a medical consultation.

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