After heredity, this is the second most common cause of baldness, especially in women. It plays a big role in triggering premature baldness in women.
On an average, women with hereditary tendencies would start losing hair in their 40s or 50s. But if these women were to suffer from hormonal imbalances at an early age, then they would also be prone to losing hair prematurely. The logic is simple, more the number of factors, sooner and faster is the hair loss.
The commonest hormonal changes faced by women are during menarche, childbirth and menopause. These are not diseases, and the hormone levels are perfectly normal during these phases and yet it triggers hair loss. This is because the hair roots become more receptive to the hormone androgen latching onto the molecules leading to baldness. Something similar also occurs after menopause when there is a natural lowering of the female hormones allowing masculine features to develop like baldness and increase in facial hair seen as rudimentary moustache and beard.
Furthermore, due to stress and environmental triggers there has been a steady rise in the number of women suffering from disorders like PCOD and thyroid imbalances. These in turn trigger hair loss prematurely.
Another study showed women entering into early menopause, as much as 10 years earlier than their mothers. With the increase in such instances, it is not surprising to see increasing onset of baldness in women at younger ages.