To release and growth of an egg to be held on balance be struck between estrogen, progesterone, follicle stimulating hormone and luteinizing hormone. When one or more of these is unbalanced then ovulation disorders can cause these disorders are the number one reason for infertility in women. br fertilization of the ovum develops in the fallopian tubes and sometimes can not be a total or partial obstruction of the fallopian tubes and prevent fertilization then we will be successful. The fallopian tubes may be damaged by bacterial infection, sexually transmitted diseases and complications that can arise after surgery. br fibroids or polyps are benign growths that can grow on the walls of the uterus that can interfere with successful embryo attaching to the wall of the uterus. Sometimes the shape and texture of cervical mucus can change this, then it will very difficult for sperm to successfully penetrate the egg. br This is a condition where the lining of the uterus, outside of the reproductive system forms, which can block the fallopian tubes and cause problems with conception. br The womans ovaries may contain many small cysts that cause the ovary larger than normal, women who suffer from this condition may have problems with their periods and can not ovulate, resulting in infertility. br This problem is associated with medical treatments for problems such as ovarian tumors. Ovarian failure is often the result of chemotherapy and radiotherapy for pelvic cancer in other body parts. br Age often plays a critical role in infertility as decreased reproductive function of the age of 35 years and older, women can only produce a certain number of eggs unlike the man who can produce sperm unlimited. The age of women receive less eggs left and the quality of eggs also reduces the age of a woman ages. Aging also may have an effect on reproductive organs and increased miscarriage also receives more. br br