What causes unpleasant vaginal odor?

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An unpleasant vaginal odor usually results from a pH imbalance which has allowed for the flourishing of odor-causing micro-organisms in the vagina. The optimal range of vaginal pH is 3.8 to 4.5 (acidic), and when imbalanced, the pH can increase and become more alkaline (less acidic), allowing unfriendly bacterial to proliferate. Vaginal odor may be yeasty, signifying a Yeast Infection or fishy, sometimes signifying Bacterial Vaginosis.