Male factor infertility may result from low sperm count or low sperm motility or decreased the ability of the sperm to fertilize the egg or abnormal shape of sperms or lack of semen or inability of a man to deposit the sperm into the vagina due to erectile dysfunction or hypospadias. The leading cause of male infertility is low sperm count. Others may be low sperm motility, bad quality sperms, lack of semen, presence of pus cells in semen & inability to deposit semen into vagina either due to absent ejaculation or due to any sexual dysfunctions as erectile dysfunctions. In general, most cases of male infertility are due to low sperm count.
There are many biologic and environmental factors that can lead to low sperm count. Here is a list of conditions that may cause low sperm count in men. Please click the links for detail information about causes, investigations & treatment options.