Yeast infection causes nearly one hundred percent of all yeast infections. Not exactly specific either age or gender, Candidiasis infections flourish within most moist warm areas on the body like the oral cavity, penis, vagina, arm pits, fingernails and toenails. The bacterium are always within each of us however are only allowed to prosper when the body's pH balance starts to rise in acidity. This pH imbalance may be caused by stress, diet, external forces and hormonal balances.