Causes of male infertility: Generally speaking, infertility in men is related to issues with the following: effective production of sperm sperm count, or the number of sperm shape of the sperm movement of the sperm, which includes both the wiggling motion of the sperm themselves and the transport of the sperm through the tubes of the male reproductive system There are a variety of risk factors, medical conditions, and medications that can also affect fertility. Risk factors Risk factors associated with infertility in men include, but aren’t limited to: older age smoking cigarettes heavy use of alcohol being overweight or obese exposure to toxins, such as pesticides, herbicides, and heavy metals Medical conditions Some examples of medical conditions that can cause male infertility include: retrograde ejaculation varicocele, or the swelling of the veins around the testicles testicles that haven’t descended into the scrotum having antibodies that attack your sperm and destroy them a hormonal imbalance, such as low testosterone production.Best Fertility Care Centre , Advanced Fertiltiy Care Centre , Ashwini Hospital & Fertility Care Centre Moondrumavadi Madurai -07 , Maternal & Child Health Care Centre.