BV is a very common vaginal infection that happens when the good and bad bacteria (germs) in your vagina are out of balance. Your vagina normally has many kinds of bacteria in it. Most are good bacteria. The good bacteria help keep your vagina healthy by limiting the growth of bad bacteria. If you have BV, the amount of good bacteria goes down and the amount of bad bacteria goes up.
You'll likely have a vaginal discharge (thick liquid coming out of your vagina) that's gray or white and smells fishy
BV usually goes away a few days after starting medicine, but it often comes back
If untreated, BV can cause serious health problems (such as PID) and complications if you're pregnant
BV is caused by a change in the amount of different bacteria in your vagina. No one knows what causes the change or if the problem can come from having sex. You can get BV even if you've never had sex. But it is more common if you:
Your doctor will suspect BV based on your symptoms. To tell for sure, your doctor will do a pelvic exam. During a pelvic exam, your doctor first looks at your vulva and then looks inside your vagina. In order to see inside, your doctor will hold your vagina open with a small instrument called a speculum. Your doctor will take a sample of your discharge (if you have any) to test it.
Your birth control method may not work while you're being treated. Some medicated creams used to treat BV weaken condoms and diaphragms.