Male infertility can be caused by low sperm production, abnormal sperm function or blockages that prevent the delivery of sperm. Illnesses, injuries, chronic health problems, lifestyle choices and other factors may contribute to male infertility.

Can a man be naturally sterile?

In about 50% of cases, the cause of male infertility cannot be determined. A complete lack of sperm occurs in about 10% to 15% of men who are infertile. A hormone imbalance or blockage of sperm movement can cause a lack of sperm. In some cases of infertility, a man produces less sperm than normal.

Can a sterile man get a woman pregnant?

Male infertility is any health issue in a man that lowers the chances of his female partner getting pregnant. About 13 out of 100 couples can't get pregnant with unprotected sex.