Introduction: The World Health Organization defines infertility as the inability of a sexually active couple to achieve pregnancy despite unprotected intercourse for a period exceeding 12 months.
Reproduction and fertility are important for species survival. This remains a common disorder, it is estimated that the proportion of couples seeking infertility treatment is between 4-17%. In 20% of couples the problem is the male and 26% in both.
Causes: The causes vary widely. Overall, between 15 and 20% of men, the cause is the lack of sperm production, at 10% is lower sperm density, genetic disorders (10-20%) and between 40 and 60% of cases not possible to define the specific cause of infertility.
There are other causes that are treatable as gonadotropin deficiency, obstruction or changes in sex and are presented in a small fraction of couples, however, it is important to recognize that there are effective treatments.