Many women have an occasional bout of vaginal thrush. It is due to an infection with a yeast fungus called Candida spp. Most cases of thrush are caused by the yeast called Candida albicans but other types of Candida spp. can also cause thrush. Common symptoms of vaginal thrush are itching, soreness, and redness around the outside of the vagina and a thick, creamy white, odourless vaginal discharge.