The vagina is a tubular part of the female reproductive system that extends from the vulva (the external part of the vagina) to the cervix. In vaginal thrush, the healthy balance of bacteria and fungi in the vagina is disrupted. Seventy-five per cent of women will experience vaginal thrush at some point in their lives.
One of the causes is menopause. Sex hormones stimulate the growth of good bacteria in your vagina, such as lactobacilli. These bacteria help protect you from infections. They maintain a normal vaginal pH level, which can also help prevent vaginal dryness. This pH level ensures there are enough good bacteria.
However, when oestrogen and progesterone levels fluctuate and decrease, other (less beneficial) bacteria and yeasts have the opportunity to grow. Lower oestrogen levels also result in a lower pH level, making it harder for good bacteria to survive. This promotes the growth of fungi and yeasts in the vagina, including candida, the fungus responsible for most cases of vaginal thrush. The result? The healthy balance of bacteria is disrupted, and the risk of vaginal thrush increases.
One reassurance: after menopause (one year after your last menstrual period), vaginal thrush generally becomes less common.