what is pid
1 Pelvic inflammatory disease (PID) is an infection of a woman's pelvic organs including the uterus (womb), Fallopian tubes (tubes), ovaries, and cervix.2  Pelvic inflammatory disease develops as the result of spread of a sexually transmitted disease. Pelvic inflammatory disease is treated with antibiotics. 2  Complications of untreated pelvic inflammatory disease can include scarring of the pelvic organs and infertility.