According to experts, the testis is an organ that determines the secondary development and reproductive ability of men and plays a vital role in men. Once any disease occurs in the testis, such as testicular atrophy's disease, it may affect the fertility of men, thus leading to male infertility. So what causes male testicular atrophy? 1. Virus infection: Virus infection is the most common cause of testicular atrophy in children and adolescents, especially mumps virus, commonly known as "mumps" disease. When the testis is attacked by this virus, the spermatogenic tissue in the testis will be destroyed, and the testis will shrink in size and become soft in texture. 2, the traditional underwear design is unfair: because the male body structure is very special, the scrotum expands and contracts to adjust the temperature of the testis, making it 2-3 degrees lower than the body temperature, so in summer, the scrotum will expand to a larger area than in winter to adjust the temperature. For example, the front of many underwear is double-layered, and the penis and scrotum are tightly wrapped, which easily leads to the increase of testicular temperature, which in turn leads to testicular atrophy. Especially in summer, the scrotum is wet and the temperature is high for a long time. After a long time, it will also cause many related skin diseases and physiological diseases. Underwear is the main reason, which is often overlooked. 3. Testicular injury: There has been an impact injury to the scrotum or testis, resulting in scrotal hematoma or testicular laceration. Even if the wound heals, the testicles will be in a state of insufficient blood supply for a long time and shrink. 4, testicular inflammation: severe orchitis, testicular swelling pain at the onset, can last for many days. Testicular tissue was destroyed by bacterial invasion, resulting in testicular tissue atrophy. 5. Effects of radioactive substances: People who have been exposed to radioactive substances for a long time, such as professionals who have been engaged in X-ray and isotope work for a long time, will cause testicular atrophy's disease if their protection is not good. 6. Endocrine diseases: Testis is an endocrine organ, which mainly produces androgens. However, many diseases of endocrine organs in the body, such as pituitary gland, adrenal gland and hypothalamus, will interfere with the function of testis and cause testicular atrophy. The above is an introduction to the reasons for testicular atrophy. Experts remind male friends that testicular atrophy is also an abnormal testicular disease, which will lead to male infertility. Attention should be paid to it. Never ignore the existence of diseases. If there is any abnormality, you should consult an expert and seek treatment. The above is the introduction of andrology experts. I believe everyone knows something about it.