Approximately 20% of female infertility can be attributed to tubal causes. Distal tubal occlusion (affecting the end towards the ovary) is typically associated with hydrosalpinx formation and often caused by Chlamydia trachomatis. Pelvic adhesions may be associated with such an infection. In less severe forms, the fimbriae may be agglutinated and damaged, but some patency may still be preserved. Midsegment tubal<unk>  can be due to tubal ligation procedures as that part of the<unk>  is a common target of sterilization interventions. Proximal tubal occlusion can occur after infection such as a septic abortion. Also, some tubal sterilization procedures such as the Essure procedure target the part of the<unk>  that is near the uterus.
Fallopian tube obstruction
Primary ovarian insufficiency
Mullerian anomalies
Blighted ovum
Gonadal tissue neoplasm
Anovulation
Male accessory gland infection
Ovarian remnant syndrome