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Infection from sexually transmitted pesin example be Gonorrhoea, Chlamydia, or prostatitisHormone imbalance, like hypogonadism dis one mean hormone production we no reduce Genetic problem like Klinefelter syndrome dat one na wen testicle growth dey affected.Structural problem, example, the tube wey carry sperm don spoil or and block sake of sickness or injury, or mayb e dey absent from birth. Too much heat, like make pesin wear tight pants.Too much alcohol consumption, smoking and drugs like marijuana or cocainePetrol chemical,plastic, paints, radiation x-ray, fumigation, insecticide dis one ghas to do wit di environment, Oga Asiru tok. 