Pelvic inflammatory disease
Pelvic inflammatory disease is infection ascending from the lower genital tract into the uterus, fallopian tubes and adjacent structures, where the resulting inflammation and scarring (not the initial infection itself) cause its long-term morbidity.
First principles
PID is the consequence of ascent, not a distinct organism
Pelvic inflammatory disease is not caused by one specific pathogen but is the anatomical consequence of lower genital tract infection (classically Chlamydia trachomatis or Neisseria gonorrhoeae, though anaerobes and other endogenous vaginal flora contribute) spreading upward past the cervix into a normally near-sterile upper tract. Once organisms reach the endometrium (endometritis) and fallopian tubes (salpingitis), and sometimes the ovaries and peritoneum, the resulting inflammation is what defines the syndrome. Because ascent can occur with more than one organism, and cultures are frequently negative, diagnosis is clinical and treatment is broad rather than pathogen-specific.
Educational content pending clinical review. Not medical advice.