The followings are causes listed based on examination result. It does not reflect/elevate to the functional pattern differentiation and use of acupuncture and Chinese Medicine. Highlights Blockages Varicocele Irregular sperm Sperm allergy Unexplained fertility problems Combination fertility problems Following link has been Reviewed by Anthony Propst, M.D., August, 2006   http://www.babycenter.com/0_common-causes-of-fertility-problems-in-men_1228908.bc