A change in the balance of bacteria that normally live in the vagina causes BV.1,2,3
Usually, "good" bacteria (lactobacilli) outnumber "bad" bacteria (anaerobes) in your vagina. But if anaerobic bacteria become too numerous, they upset the natural balance of microorganisms in the vagina and lactobacilli decrease.
Factors that can disrupt the balance of bacteria in the vagina include:
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