Where do the fallopian tubes usually get blocked or scarred is it in the inside of the tube ?

Blocked tubes ?: Fallopian tubes become blocked secondary to inflammation, usually caused by infection or endometriosis. The scarring occurs inside the tubes from the origin in the uterus to the end of the tubes. Often, infection does not produce many symptoms, so making sure one's partner(s) is not infectious is very important to preserve fertility.