Pelvic inflammatory disease (PID) refers to infection of the uterus (womb), fallopian tubes (tubes that carry eggs from the ovaries to the uterus) and other reproductive organs.
It is a common and serious complication of some sexually transmitted infections (STIs), especially chlamydia and gonorrhea.
PID can damage the fallopian tubes and tissues in and near the uterus and ovaries. Untreated PID can lead to serious consequences including infertility, ectopic pregnancy (a pregnancy in the fallopian tube or elsewhere outside the womb), abscesses, and chronic pelvic pain.