There are many effects of monorchidism, such as affecting spermatogenesis, testicular torsion, in addition to psychological pressure on the patient. 1. Affecting spermatogenic function: monorchidism may be unilateral absence of testis, cryptorchidism, ectopic testis or wandering testis, but either of them may cause male infertility. According to the research surface, for patients with monorchidism, the chance of infertility is about 30%~60%. 2. Testicular torsion: In case of cryptorchid testis, since cryptorchid testis is not protected by the scrotum, its mobility is quite large, so when the human body is hit by the outside world, it will be more prone to torsion, which will lead to severe pain. 3. Psychological pressure: for men with only one testicle, as there is no testicle in the unilateral scrotum, and the position and size of the testicle are also abnormal, so it will have certain impact on the patient’s psychology. If it is a single testicle, patients should seek medical examination in time and cooperate with doctors to choose the appropriate way for standardized treatment to avoid bringing adverse effects to the body.