What is a vaginal yeast infection?, Vaginal Yeast Infections, How do I know if I have a yeast infection? Thehealthtime.com Vaginal Yeast Infections What is a vaginal yeast infection? Vaginal yeast infections are caused by a fungus called Candida albicans. Yeast are tiny organisms that normally live in small numbers on the skin and inside the vagina. The acidic environment of the vagina helps keep yeast from growing. If the vagina becomes less acidic, too many...