Usually the removal of one testicle will not affect fertility. Whether it is a testicular tumor or not, such as a testicle removal caused by a general lesion, a testicle that is traumatically broken and needs to be removed, or a testicle that is atrophied, or some other problem that requires a testicle removal, it is basically similar to a testicular tumor removal. Usually, the reason why one testicle can still be fertile after removal is because the opposite side can compensate for it, especially in young patients during the puberty development stage. At this time, if the testicle is removed, the opposite side can develop adequately and compensate for the sperm production and androgen production to maintain normal male function. However, in a few cases there may still be a risk of infertility. For example, if the contralateral testicle is not fully compensated, the contralateral testicle itself has potential pathology, such as epididymitis, small testicle development, or some other problems, or the pathology on this side, for example, the testicle on this side may be twisted and then spread to the contralateral side, or the varicocele on this side may cause problems on the contralateral side, which may cause the patient to be at risk of infertility.