A relatively small number of women are able to grow enough facial hair to have a distinct beard. The condition is called hirsutism. It is usually the result of polycystic ovary syndrome which causes excess testosterone and an over-sensitivity to testosterone, thus (to a greater or lesser extent) results in male pattern hair growth, among other symptoms. In some cases, female beard growth is the result of a hormonal imbalance (usually androgen excess), or a rare genetic disorder known as hypertrichosis. In some cases a woman’s ability to grow a beard can be due to hereditary reasons without anything medically being wrong.