Chronic pelvic inflammatory disease (PID), as it was called in the past, is now medically referred to as the sequelae of pelvic inflammatory disease (PID), which is the result of failure to receive timely and correct diagnosis and treatment, or incomplete treatment. Pelvic inflammatory disease, or PID for short, refers to a group of infectious diseases of the upper female reproductive tract, including endometritis, tubal inflammation, tubo-ovarian abscess, and pelvic peritonitis. The main pathological changes of chronic pelvic inflammatory disease are tissue destruction, extensive adhesions, hyperplasia and scar formation. Clinical manifestations include infertility (20-30% incidence), ectopic pregnancy (8-10 times more than normal women), chronic pelvic pain (manifested as lower abdominal cramps, pain and lumbosacral aches, often intensified after exertion, sexual intercourse and around menstruation), and recurrent pelvic inflammatory disease (about 25% recurrent). The treatment of chronic pelvic inflammatory disease requires a choice of treatment options depending on the situation. In patients with infertility, assisted reproductive technology is needed to assist conception (IVF); for chronic pelvic pain, there is no effective treatment, but symptomatic treatment or a combination of Chinese herbal medicine and physical therapy should be given, and other diseases causing pelvic pain such as endometriosis should be excluded before treatment; for recurrent pelvic inflammatory disease, surgery can be chosen according to the specific situation based on antibiotic treatment; for fluid in the fallopian tubes, surgery is needed. The treatment should be carried out if there is fluid in the fallopian tubes. Chronic pelvic inflammatory disease is the sequelae of pelvic inflammatory disease not timely and thoroughly treated, and the treatment for it is very limited and ineffective at this stage.