Candida albicans usually live harmlessly in small amounts in the vagina, the mouth, the digestive tract, and on the skin without causing symptoms. However, yeast infection symptoms can appear when the environment in the vagina makes it difficult for other microorganisms to survive and favorable to the growth of Candida albicans.
There are several factors that can make the environment in the vagina favorable to yeast infection, including:
Using perfumed feminine hygiene sprays
Using topical antibiotics and steroid medicines
Wearing tight, poorly ventilated clothing and underwear