What causes yeast infections? A yeast infection is actually the result of an overgrowth of a common fungus Candida known. This fungus is usually in small quantities in her vagina, digestive system, blood, and even the skin. When the immune system is out of balance, they multiply rapidly and cause a wide range of confusing symptoms. Although yeast affect both men and women, vaginal fungal infections, are by far the most common and are the typical symptoms for most women seek medical advice.
