Infertility is an emerging and commonly occurring problem in the world. It affects millions of couples every year, and many have no idea what to do about it. Infertility can be caused by a number of factors, but one common cause is that the woman has trouble becoming pregnant. For example, if your ovary has been removed by surgery or radiation therapy for cancer treatment, it may be difficult for you to become pregnant. You may also have an irregular menstrual cycle or be unable to get pregnant after trying for a year or more with no success.