23 citations,
January 1994 in “Skin Pharmacology and Physiology” Hair loss in men and women is linked to high stress hormone levels and other hormonal imbalances, suggesting treatments should be customized to each person's hormones.
2 citations,
January 1989 in “PubMed” 
22 citations,
January 2013 in “International Journal of Trichology” Hair loss is often linked to thyroid problems, especially in women and older people, and screening for thyroid issues is advised for those with hair loss.
19 citations,
January 2012 in “Dermato-endocrinology” Moderately high prolactin levels do not cause hair loss in women.