Bacterial vaginosis is the most common cause of abnormal vaginal odor and discharge. It is caused by a change in the
type of bacteria found in the
exact cause for the change in type of bacteria is still not known, but it is can be due to IUD’s,multiple sex partners or having intercourse with a new partner.
In addition to unpleasant "fishy" vaginal odor, thin white or yellowish discharge from vagina may also be present.