Causes Pelvic Inflammatory Disease

Normally, the cervix prevents bacteria that enter the vagina from spreading to the internal reproductive organs. If the cervix is exposed to a sexually transmitted disease -- such as gonorrhea and/or chlamydia -- the cervix itself becomes infected and less able to prevent the spread of organisms to the internal organs. PID occurs when the disease-causing organisms travel from the cervix to the upper genital tract. Untreated gonorrhea and chlamydia cause about 90% of all cases of PID. Other causes include abortion, childbirth, and pelvic procedures.