causes of yeast and bacterial infection
The fungus candida causes a vaginal yeast infection. Your vagina naturally contains a balanced mix of yeast, including candida, and bacteria. Lactobacillus bacteria produce acid, which prevents yeast overgrowth. That balance can be disrupted and lead to a yeast infection.oo much yeast in your vagina causes vaginal itching, burning and other classic signs and symptoms of a yeast infection. Overgrowth of yeast can result from: 1  Antibiotic use, which decreases lactobacillus bacteria in your vagina and changes the pH of your vagina. 2  Pregnancy. 3  Uncontrolled diabetes. 4  Impaired immune system.