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.
But many a times there is no cause associated with low or abnormal sperm count. 2-3 cycles of IUI may be beneficial for the unexplained infertility, If not success then IVF-ICSI is the treatment of choice.