Cryptorchidism is a malformation in which the testicles do not descend bilaterally or unilaterally into the scrotum after 2 months of life. There are two types of cryptorchidism: true cryptorchidism and pseudocryptorchidism. Pseudocryptorchidism means that the testicles are not found in the scrotum but can be felt above the scrotum or in the groin; true cryptorchidism is not only that the testicles are not felt in the scrotum, but also in the upper part of the scrotum or in the groin, which is too high and often located in the abdominal cavity. Whether it is true or false cryptorchidism, or bilateral or unilateral cryptorchidism, it is collectively called cryptorchidism. The harm of cryptorchidism to human body 1. It affects the function of sperm production and causes infertility. According to research, people with only one testicle have about 30% to 60% chance of being infertile after marriage in the future; while for people with bilateral cryptorchidism, the percentage of infertility is 50% to 100%; 2. Testicular cancer. It is estimated that the chance of testicular cancer in cryptorchidism patients is 20 to 48 times greater than that in normal people, and it is reported that about 15% of cryptorchidism patients have testicular cancer; 3. Cryptorchidism is often caused by the testicles “anchoring” in the inguinal canal on the way down to the scrotum, at this time, because the testicles are in a fixed position and have lost the environment of being able to move freely in the scrotum, therefore, when the lower abdomen is subjected to external force, it is very easy to occur damage; 4, induce “small intestine gas “. Patients with cryptorchidism are most likely to suffer from “small intestine gas” due to abnormal development of the groin area; 5. Testicular torsion. Due to the lack of scrotal protection, cryptorchidism has a large degree of activity. When the human body is subjected to accidental shock or impact, the testicle group is prone to twist, thus causing severe pain; 6. Psychological pressure. Since the scrotum is “empty” when cryptorchidism occurs, and the position and size of the testicles are abnormal, boys may have worries and low self-esteem when they reach the age of understanding; in addition, since the testicles cannot produce sperm normally, the male hormones secreted by the testicles will be reduced, and thus the formation of male sexual characteristics will be affected. All this will make these men’s physical and mental health seriously affected. Therefore, when you find that you have only one testicle, you must not be paralyzed, but must seek medical treatment early and choose the appropriate time and method to reset the testicle.