TLDR Different thicknesses of hair strands can indicate the severity of hair thinning.
The study from April 30, 2001, proposed a new clinical scoring method for evaluating the degree of androgenetic alopecia based on hair diameter diversity. The researchers found that this macroscopic scoring method was significantly correlated with the Hamilton classification and histological hair density. They also observed that diversity in hair diameter was the most accurate clinical parameter linked to follicle miniaturization, a key factor in the onset and development of androgenic alopecia. The anagen-telogen ratio also decreased in parallel with the decrease in clinical hair density score. The study concluded that hair diameter diversity is an important, easily accessible, and reliable parameter for diagnosing and managing androgenic alopecia.
115 citations,
November 1999 in “Journal of The American Academy of Dermatology” Minoxidil increases hair weight and count temporarily in men with hair loss.
122 citations,
April 1995 in “Journal of Cutaneous Pathology” The document describes how to tell different types of non-scarring hair loss apart by looking at hair and scalp tissue under a microscope.
309 citations,
May 1993 in “Journal of The American Academy of Dermatology” Horizontal scalp biopsy sections effectively diagnose and predict MPAA, with follicular density and inflammation impacting hair regrowth.
71 citations,
May 1991 in “Clinical and Experimental Dermatology” Young men with male pattern baldness lose hair density over time without treatment.
6 citations,
January 1981 
666 citations,
September 1977 in “British Journal of Dermatology” Common baldness, also known as Androgenetic Alopecia, is caused by a combination of genetic factors and hormones called androgens.
41 citations,
May 2001 in “PubMed” Different thicknesses of hair strands can indicate the severity of hair thinning.
19 citations,
November 1979 in “Archives of dermatology” Tretinoin may be effective for treating Fox-Fordyce disease.
