Infertility is the inability to have a pregnancy within 12 months of trying. Some of the causes of this condition are related to males, some are related to females.
Common causes of infertility are:
Problems with ovulation / eggs
Problems with the uterus / endometriosis
Blockage of the fallopian tubes
Changes in hormones / prolactin
Male factors / sperm quality
Evaluation of the causes of infertility require a careful evaluation of medicines and medical history, genetic family history, and testing for sperm count, appearance, uterus and fallopian tube anatomy, hormone testing, and sometimes genetic testing of the blood, sperm or the eggs.