A man’s fertility rate generally relies on the quantity and quality of his sperm. If the amount of sperm a man ejaculates is low or if the sperm is of poor quality, it will be difficult and sometimes impossible for him to impregnate a female.
According to Prof. Oladapo Ashiru, a male infertility is usually caused by problems that affect either sperm production in the testes or sperm transport.
See 10 of such causative factors of low sperm count in men.
Certain surgeries, including vasectomy, might prevent you from having sperm in your testicles. Inguinal hernia repairs, scrotal or testicular surgeries, prostate surgeries, and large abdominal surgeries performed for testicular and rectal cancers, among others, are also suspect. In most cases, surgery can be performed to either reverse these blockages or to retrieve sperm directly from the epididymis and testicles.