Pelvic inflammatory disease (PID) is the most serious complication of sexually transmitted infections (STIs, also known by the older name of sexually transmitted diseases or STDs) such as chlamydia and gonorrhea.
PID affects the upper female genital tract including the cervix, uterus, ovaries, and fallopian tubes. Each year, there are approximately 100, 000 cases of symptomatic PID in Canada, and up to two-thirds of cases go unrecognized. It's the leading cause of tubal infertility in young women, but it can usually be prevented if STIs are detected and treated early. One of the long-term consequences of PID is chronic pelvic pain.