Contribution of Hair Density and Hair Diameter to the Appearance and Progression of Androgenetic Alopecia in Japanese Men

July 2014 in “ British Journal of Dermatology ”

A. Ishino, Tadayuki Takahashi, Jiro Suzuki, Yasuhiro Nakazawa, Takashi Iwabuchi, Michio Tajima

androgenetic alopecia hair density hair diameter hair thickness miniaturisation of hair follicles hair loss baldness AGA hair thinning

TLDR Hair thickness matters more than density for baldness in Japanese men over 25.

This study investigated the contribution of hair density and hair diameter to the appearance and progression of androgenetic alopecia (AGA) in Japanese men. The study found that hair thickness is more important than hair density in the appearance and progression of baldness in male subjects with AGA. Hair density in male subjects with AGA is not significantly different from that in male subjects without AGA. Hair density decreases in male subjects of ≥ 25 years of age, regardless of the presence or absence of AGA. The study concluded that hair loss in male AGA subjects mainly results from the miniaturisation of hair follicles rather than the loss of hair (shedding), at least for individuals who are ≥ 25 years of age and present with AGA.

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Research cited in this study

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research Characteristic Features of Japanese Women's Hair With Aging and Hair Loss

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research Quantification of Hair Follicle Parameters Using Computer Image Analysis: A Comparison of Androgenetic Alopecia with Normal Scalp Biopsies

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Young men with male pattern baldness lose hair density over time without treatment.

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The unit area trichogram is a reliable method to assess hair loss and treatment response in people with androgenic alopecia by measuring hair density and thickness.

research Comparative Studies of the Diameters of Hairshafts in Anagen and Telogen Phases in Male Adults Without Alopecia and in Male Adults With Androgenetic Alopecia

6 citations, January 1981

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