Tubal ligation can predispose to ectopic pregnancy. Fallopian tube obstruction may be a cause of infertility or ectopic pregnancy. Thyroglossal cysts are associated with an increased incidence of ectopic thyroid tissue. Reversal of tubal sterilization (tubal reversal) carries a risk for ectopic pregnancy. Pregnancy loss is a broad term that for miscarriage, ectopic and molar pregnancies. A laparoscopy in very early ectopic pregnancy rarely shows a normal looking fallopian tube. Vaginal douching is thought by some to increase ectopic pregnancies. The vast majority of ectopic pregnancies implant in the Fallopian tube. Abnormal tissue interaction during this process can result in ectopic tooth development. The risk of ectopic pregnancy after chlamydia infection is low. Half of ectopic pregnancies are due to a salpingitis infection. There are a number of risk factors for ectopic pregnancies. Nausea, vomiting and diarrhea are more rare symptoms of ectopic pregnancy. Women who smoke have a higher chance of an ectopic pregnancy in the fallopian tubes. Women with pelvic inflammatory disease (PID) have a high occurrence of ectopic pregnancy.