Acute or chronic inflammation of the fallopian tube. It is most often caused by Neisseria gonorrhoeae and Chlamydia trachomatis infections. The infections usually originate in the vagina and ascend to the fallopian tube. Symptoms include abdominal, pelvic, and lower back pain, pain during ovulation and sexual intercourse, fever, nausea, and vomiting. Complications include infertility and ectopic pregnancy.