The causes of BV and Yeast infections :

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While BV and yeast infections share many similarities symptom-wise, the two infections have very different causes. In the case of BV, something typically has to disrupt the vagina’s natural bacterial balance. When everything is at it should be, the “good” bacteria (lactobacilli) outnumber the “bad” bacteria (anaerobes). But if something comes along and disrupts the vaginal environment, BV can develop. A few of the most common causes of that disruption:

  • Douching or excessive cleaning of the vagina
  • Hormonal changes that accompany events like menstruation, pregnancy, and menopause
  • Having penile-vaginal sex with a new partner

Yeast infections are different, but some of the initial root causes can be the same. While your vagina naturally contains different types of yeast, the good bacteria we discussed earlier — lactobacilli — typically keep it in check. When something disrupts that delicate balance of bacteria, it can create an overgrowth of one specific type of yeast called candida. Some of the reasons for this overgrowth include:

  • Birth control pills or hormone therapies that increase estrogen levels.
  • The use of antibiotics
  • Uncontrolled diabetes
  • Pregnancy
  • An impaired immune system

It’s important to know that BV and yeast infections aren’t considered sexually transmitted infections (STIs), although they can develop as a result of sexual activity