Symptoms of blocked fallopian tubes Blocked fallopian tubes are one of the common causes of female infertility. Acquired factors, reproductive tract infection, surgery and other reasons can cause fallopian tube blockage. When the fallopian tubes are blocked, the egg and sperm cannot meet and fertilization cannot occur. Blocked fallopian tubes may also lead to complications such as ectopic pregnancy. Symptoms of blocked fallopian tubes generally include: irregular menstrual periods, heavy menstrual bleeding