Hi and welcome to Healthcaremagic. Thank you for your query. I am Dr. Rommstein, I understand your concerns and I will try to help you as much as I can. You should first check you prostate and do ultrasound and check PSA levels,also ultrasound of testicles should be done to rule out testicle atrophy. these are most common causes. then further obstruction of ductus deferns is possible. after the diagnosis is establihed,treatment can be planned. I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.