Male infertility is implicated in approximately half of couples who cannot conceive after a year of unprotected sex. Some medical causes of male infertility include varicocele, infections that damage the reproductive organs, issues with ejaculation, antibodies that attack sperm, and tumors affecting the reproductive system. A doctor will examine the patient and their medical history, conduct a semen analysis, and may recommend procedures to address physical causes of infertility. Varicocele repair is a common outpatient procedure that can often fix male infertility issues.