The fallopian tubes are two thin tubes on each side of the uterus, which helps lead the mature eggs from the ovaries to the uterus, when an obstruction prevents the egg from traveling down the tube which leads to a blocked fallopian tube. Symptoms
Infertility, lower abdominal pain, unusual vaginal discharged

Causes
Pelvic inflammatory diseases ,STD Infection, Chlamydia or gonorrhea. History of a ruptured appendix, previous ectopic pregnancy. Endometriosis e.t.c