Varicocele, a killer of men’s health, is found in 10% of men between the ages of 30 and 40. It occurs 90% of the time on the left side and is caused by stagnation of blood flow in the spermatic veins, resulting in dilatation, tortuosity and elongation of the plexus vessels. Varicocele can also be caused by kidney tumors. The reason for the importance of varicocele is that it may be associated with testicular atrophy and impaired sperm production, leading to infertility. The incidence of dilated, curved, and lengthened trapezoidal plexus of the spermatic cord is called varicocele. It is mostly seen in young people, mostly between 16 and 25 years old, with an incidence of about 15%, 99% occurring on the left side and about 1% bilaterally. The left internal spermatic vein near the left renal vein has no valve, so the blood is easy to backflow. The left internal spermatic vein is located after the sigmoid colon and is easily compressed by feces in the intestine, which affects the blood reflux. Varicocele is caused by: 1. Too high temperature and poor heat dissipation. 2, congenital left spermatic vein vascular valve insufficiency. Congenital left spermatic vein vascular valve insufficiency can cause blood stagnation in the left spermatic vein. 3, blood stagnation, damage to the testes. 4. Damage to the interstitial cells of the testis. Clinically, varicocele can be divided into three degrees: degree 1 (mild): when standing, no varicose veins can be seen protruding from the scrotal skin, but varicose veins can be felt in the scrotum, and when lying down, the varicose veins disappear quickly. Degree 2 (moderate): dilated veins can be seen on the scrotum when standing, and more obvious varicose veins can be felt in the scrotum, and the mass gradually disappears when lying down. Degree 3 (severe): There are obvious thick blood vessels on the surface of the scrotum, and there are obvious worm-like dilated veins in the scrotum, and the walls of the veins are thickened and hardened; they disappear slowly when lying down. Varicocele can cause progressive impairment of testicular function and reduced fertility in some patients from puberty onwards, but this impairment only becomes apparent if their partner’s fertility is also reduced. Varicocele can sometimes affect fertility. Nine percent of people with varicocele have infertility, and 39 percent of male infertility is caused by varicocele. In severe cases, it can cause testicular atrophy. The cause is an increase in temperature in the scrotum on the affected side that is reflected to the opposite side, causing degeneration and atrophy of the spermatogonia and a decrease in the number of spermatozoa. Although it has not been medically proven that body size is related to varicocele, it may be due to the right-angle shape of the spermatic vein returning to the left renal vein, which affects the blood flow.