Renee who has been trying to conceive a baby for a long time and was told that Fallopian tubes are scarred and may prevent conceiving a baby has endometriosis. Endometriosis is a condition in which the type of tissue that forms the lining of the uterus (the endometrium) is found outside the uterus. This condition often causes very painful and heavy periods and pelvic pain, and can increase the risk for blocked fallopian tubes.