You can look up the symptoms for bacterial vaginosis. There is sometimes a white or clear discharge and it may (or may not) have a fishy smell. Sometimes there are no symptoms. It is caused by an overgrowth of bacteria that are normally present. Your doctor can diagnose it with a PH test (the PH will be higher than normal) and by viewing a sample under the microscope OR a sample may be sent to a lab. This is sometimes caught during an annual pap test. It is usually treated with an antibiotic cream (metronidazole) or pill.