Uterine or cervical causes Several uterine or cervical causes can impact fertility by interfering with implantation or increasing the likelihood of a miscarriage: Benign polyps or tumors (fibroids or myomas) are common in the uterus. Some can block fallopian tubes or interfere with implantation, affecting fertility. However, many women who have fibroids or polyps do become pregnant. Endometriosis scarring or inflammation within the uterus can disrupt implantation. Uterine abnormalities present from birth, such as an abnormally shaped uterus, can cause problems becoming or remaining pregnant. Cervical stenosis, a narrowing of the cervix, can be caused by an inherited malformation or damage to the cervix. Sometimes the cervix can't produce the best type of mucus to allow the sperm to travel through the cervix into the uterus. Ashwini Hospital & Fertility Centre , Moondrumavadi K.Pudur Madurai-07 , Maternal & Child Health Care Centre , Advanced Fertility Care Centre ,