A section of infertile women tends to suffer from fallopian tube blockage, which is caused by various inflammations in the area around the fallopian tubes. Often a dangerous condition, the blockage can have internal causes (polyps, for e.g.) or can be the result of external adhesions. Another possible cause is a sexually transmitted disease (STD) like the pelvic inflammatory disease. The blockage can hamper the egg’s journey to the uterus via the fallopian tube. Either laparoscopy or hysterosalpingography is used to detect tube blockage.