Pelvic inflammatory disease (PID) is an infection of the upper female genital tract. It encompasses an array of inflammatory disorders, including endometritis, parametritis, salpingitis, oophoritis, tubo-ovarian abscess, peritonitis, and perihepatitis. In most adolescents with acute severe infections it is difficult to differentiate some of these entities; thus the term PID is used commonly. Perihepatitis (Fitz-Hugh-Curtis syndrome) and tubo-ovarian abscess are acute complications, whereas chronic complications include infertility, ectopic pregnancy, and chronic pain.