What cause vaginal dryness?

Estrogen deficiency : Estogen deficiency or decreased blood supply to the vagina are the most frequent causes of dryness, but chronic vaginal inflammation(allergic or infection) is a less likely cause.

Menopause: By far the most common cause for women in your age group is lack of estrogen. There can be other issues like infection, but they usually are associated with other symptoms. The dryness of menopause can be treated with estrogen creams or a procedure like the MonaLisa Touch laser