Fallopian tube damage is a common cause
ectopic pregnancy. A fertilized egg can become caught
in the damaged area of a tube and begin to grow there. Some ectopic pregnancies
occur without any known cause.
Common causes of
fallopian tube damage that may lead to an ectopic pregnancy include:
Smoking. Women who smoke or who used to smoke
have higher rates of ectopic pregnancy. Smoking is thought to damage the fallopian
tubes' ability to move the fertilized egg toward the uterus.