Although thrush can affect both men and women, there are many ways to treat this common yeast infection, some specifically for vaginal use. Thrush can cause itching, redness and soreness of the vulva and vaginal area as well as unwanted vaginal discharge and pain during sex. Thrush is not known as a sexually transmitted disease (STD) however it can be passed during sex. Although it is essentially harmless, treating this condition can aid healing and prevent passing on to others.