August 2011 in “Clinical and Experimental Dermatology” About 30% of women feel they lose too much hair, often starting before age 40, and most can't find a reason for it.
February 2012 in “Clinical and Experimental Dermatology” Many adult women experience unexplained excessive hair shedding, often starting before age 40.
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October 1984 in “The BMJ” Up to 50% of scalp hair can be lost before it appears thin, and treatment is only needed for hair loss caused by diseases or deficiencies.
April 2019 in “Journal of the Endocrine Society” A rare adrenal tumor in a woman only made DHEA-S, causing hair thinning, and was removed, fixing the hormone level.
January 2011 in “Journal für Kardiologie (Krause & Pachernegg GmbH)” Postmenopausal women often experience hair loss on the scalp and increased facial hair, but iron supplements may not help.