Though there could be hair loss on account of stress, skin infection and disease among both men and women, baldness is generally seen in men only. The gene for baldness is present on the X-chromosome. Since women have two X-chromosomes and men only one, a woman may carry a copy of the baldness gene on the one X-chromosome with the other X-chromosome being normal.
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In this cause a woman will never go bald. On the contrary, a copy of baldness gene on the single X-chromosome of men predisposes them to baldness. According to another theory baldness is caused in those who are genetically predisposed by a male hormone which is converted from the enzyme testosterone.