<prompt> Answer this question truthfullyWhat is the pathological mechanism of ectopic pregnancy?  <response>: <reason> The most important conditionsdiseases associated with ectopic pregnancy include: Pelvic inflammatory disease PID Previous ectopic pregnancy Previous surgery on your fallopian tubes Fertility treatment, such as in-vitro fertilization IVF Becoming pregnant while using an intrauterine device IUD or intrauterine system IUS for contraception Smoking Increasing age after 40 years old 