It is a common infection that occurs when there is overgrowth of the yeast called Candida. Candida is always present in and on the body in small amounts. The symptoms of VVC are similar to those of many other genital infections, so it can be difficult to diagnose a yeast infection by physical examination only. Usually the diagnosis is made by taking a sample of the vaginal secretions and looking at the sample under a microscope to see if an abnormal number of Candida organisms are present. A fungal culture may not always be useful because Candida species are normal inhabitants of the body.