Abdominal hair

The growth of abdominal hair follows the same pattern on nearly all mammals, vertically from the pubic area upwards and from the thorax downwards to the navel.

Before puberty, the abdominal region of both males and females is covered with very fine vellus hair.

Some women may develop a small line of hair from the pubic area up to the navel.

Excessive abdominal hair on women, following the male pattern, is a type of hirsutism.

In Zickler's study the horizontal pattern was most common in females with an incidence of about 80 percent.