71 citations,
May 2007 in “The FASEB journal” Human hair follicles produce and respond to erythropoietin, helping protect against stress.
24 citations,
October 1994 in “Fertility and Sterility” People with hair loss may have different levels of certain hormones due to changes in hormone processing.
17 citations,
July 1994 in “Journal of Dermatological Science” The cause of alopecia areata is likely a mix of genetics, immune system issues, and environmental factors, with more research needed to understand it fully.
4 citations,
January 2012 in “Springer eBooks” The document concludes that signs of male and female pattern baldness include uneven hair thickness, yellow spots, skin discoloration around hair follicles, more thin and soft hairs, and many hair follicles with just one hair.