Fallopian tubes are usually blocked by scar tissue or pelvic adhesions. These can be caused by many factors, including:
----Pelvic inflammatory disease. This disease can cause scarring or hydrosalpinx.
----Endometriosis. Endometrial tissue can build up in the fallopian tubes and cause a blockage.
Endometrial tissue on the outside of other organs can also cause adhesions that block the fallopian tubes.
Certain sexually transmitted infections (STIs). Chlamydia and gonorrhea can cause scarring and lead to pelvic inflammatory disease.
---Past ectopic pregnancy. This can scar the fallopian tubes.
These growths can block the fallopian tube, particularly where they attach to the uterus.
Past abdominal surgery. Past surgery, especially on the fallopian tubes themselves, can lead to pelvic adhesions that block the tubes.
Diagnosing a blocked fallopian tube
Hysterosalpingography (HSG) is a type of X-ray used to examine the inside of fallopian tubes to help diagnose blockages. During HSG, your doctor introduces a dye into your uterus and fallopian tubes.
The dye helps your doctor see more of the inside of your fallopian tubes on the X-ray. An HSG can usually be done in your doctor’s office. It should take place within the first half of your menstrual cycle. Side effects are rare, but false positive results are possible.
If the HSG doesn’t help your doctor make a definitive diagnosis, they can use laparoscopy for further evaluation. If the doctor finds a blockage during the procedure, they might remove it, if possible.