What are the most common causes of infertility?

The most common causes of female infertility are ovulatory disorders and anatomical abnormalities such as damaged fallopian tubes. Less frequent causes include, for example, endometriosis and hyperprolactinemia. Causes of male infertility can be divided into three main categories: Sperm production disorders affecting the quality and/or the quantity of sperm; anatomical obstructions; Other factors such immunological disorders. Approximately a third of all cases of male infertility can be attributed to immune or endocrine problems, as well as to a failure of the testes to respond to the hormonal stimulation triggering sperm production. However, in a great number of cases of male infertility due to inadequate spermatogenesis (sperm production) or sperm defects, the origin of the problem still remains unexplained.