Everyone has facial and body hair but in woman the hair is often fair and fine, which makes it much less visible compared to men. The cause of excessive hair growth on a woman is called hirsutism, which is usually darker and more prominent on your face and arms. The growth pattern of hair is somewhat associated with virilisation.
Hirsutism mainly occurs due to hormonal imbalance. This condition do not cause physical pain, however it can lead to depression in women.