Same reason you can lose hair while doing steroids, it’s an excess of testosterone that causes male pattern baldness.
There are conditions though where women also lose hair but those are generally auto immune, where the immune system attacks the hair follicles. Stress can also do the same thing in both sexes.
There are different reasons men go bald the X-chromosome recessive gene is one of the reasons. Women have two x chromosomes so women need two copies of the gene to go bald. It is also caused by the male hormone dihydrotestosterone.
Additionally female pattern baldness usually looks like a diffuse thinning across the entire scalp. Whereas males either have a receding hairline or loss of hair at the crown or both. So it’s easier to see male pattern loss since it is in certain sections whereas female pattern is a thinning which might not be noticable on someone especially if you don’t know how thick their hair once was.
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