The fallopian tubes allow the egg and sperm to meet and help transport a fertilized egg toward the uterus. If one or both tubes are blocked, natural conception may become more difficult.

Possible causes include:

• Previous pelvic infection
• Endometriosis
• Scar tissue from surgery
• A previous ectopic pregnancy
• Hydrosalpinx, a fluid-filled blocked tube

Many people with blocked tubes have no noticeable symptoms. An HSG is commonly used to check whether the tubes are open. However, an apparent blockage near the uterus may occasionally be caused by temporary tubal spasm, so additional evaluation may be recommended.

Pregnancy may still occur naturally when one healthy tube remains open. When both tubes are blocked, treatment options may include surgery or IVF, depending on the location and cause of the blockage, age, ovarian reserve, sperm health, and other fertility factors.