Infertility is defined as the failure of a woman of childbearing age to conceive after one year of cohabitation without contraception. Infertility is defined as a pregnancy that does not result in a live birth, including miscarriage, premature birth or stillbirth. The terms infertility and sterility are often confused, and infertility generally seems to be considered more serious. So, what are the possible causes of infertility male? 1, semen abnormalities: such as necrospermia, sperm impotence, semen is too thick. 2, affect the semen into the cervical canal: such as hypospadias, penis too short, impotence, premature ejaculation, etc., can affect the sexual intercourse, can not be ejaculated into the vagina and reach the cervix. 3, affect sperm production: such as congenital testicular hypoplasia or cryptorchidism, does not produce sperm, or acquired inflammatory diseases, such as tuberculous orchitis or varicocele affect sperm production. 4, affect sperm transportation: epididymal disorders or congenital vas deferens obstruction, affecting sperm discharge.