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Male-pattern baldness is hereditary, which means it runs in families. It’s thought to be caused by oversensitive hair follicles, linked to having too much of a certain male hormone.
This type of baldness can also affect women (female-pattern baldness). During female-pattern baldness, hair usually only thins on top of the head. It happens more often in women who have been through the menopause maybe because they have fewer female hormones.