Bacterial vaginosis is a swelling and irritation of the vaginal tissue.
Bacterial vaginosis appears to be caused by an overgrowth of several types of bacteria, some requiring oxygen while others do not. While these bacteria are normally present in the vagina, an overgrowth may cause symptoms of irritation and inflammation.
It is not known for sure what causes this condition. It is probably caused by an overgrowth of certain bacteria that are normally present in the vagina.
Bacterial vaginosis that is left untreated or undiagnosed can cause more problems. For instance: