What sti causes burning, itching, white discharge and pain in the vagina?

Vaginal pain causes: Causes of vaginal pain are varied. Irritation can result from infection, exposure to chemicals, or trauma related to tight undergarments or intercourse (especially if the genitals are not well lubricated). Burning, itching, and white discharge is a classic description of monilial vaginitis, more commonly known as a "yeast infection.". Over the counter creams are now available and effective.