ivf_woman_holding_baby• Impaired ovulation (egg release) due to disease, infection, birth defects, or abnormal hormone production

• Blocked fallopian tubes from disease or scar tissue

• Inability of the uterus to hold the embryo (this may be due to a variety of reasons, including scar tissue on the walls of the uterus, uterine fibroids, polyps)

• Endometriosis

• Problems at the level of the cervix, blocking the entrance of sperm into the uterus