1 Answer

Bacterial vaginosis, or overgrowth of normally occurring vaginal bacteria, is the most common cause of vaginal odor. Some sexually transmitted diseases may cause vaginal odor. A retained or forgotten tampon may eventually cause a vaginal odor. Less commonly, vaginal odor may be attributed to a rectovaginal fistula — an abnormal opening between the rectum and vagina which allows feces to leak into the vagina.

Commonly, vaginal odor may be caused by:

Bacterial vaginosis
Chlamydia
Gonorrhea
Pelvic inflammatory disease (PID)
Poor hygiene
Retained or forgotten tampon
Trichomoniasis
Yeast infection (vaginal)
Less commonly, vaginal odor may result from:

Cervical cancer
Rectovaginal fistula
Vaginal cancer
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.

http://www.mayoclinic.com/health/vaginal-odor/MY00555/DSECTION=causes