Hereditary thinning is a form of hair loss in women. It occurs in all races and can be inherited from either the mother's or father's side of the family, or both. The rate at which the hair loss occurs varies between women.
Hereditary thinning can occur in normal, healthy women. Women with this type of hair loss retain their hairlines and thin diffusely, usually on the top of their heads. They may notice that their parts are wider on the top than on the sides. A normal adult scalp sheds approximately 100 hairs per day. A woman with hereditary thinning will find that, although her hair is thinning, she's not shedding more than normal. This type of hair loss is treatable with twice-daily applications of minoxidil . Such treatments should be discontinued if a woman becomes pregnant.