The vagina is a naturally acidic organ, and this is how it keeps bad bacteria and infections at bay.
When the vagina is in a healthy, acidic state, the environment is too harsh for bad bacteria to grow.
These bacteria need higher pH levels (less acidic) to thrive. However, when outside factors shift a vagina from acidic to alkaline, an overgrowth of bad bacteria can occur.
This brings discharge, bad odor, itching and other unpleasant stuff.