Definition: Varicocele is the abnormal elongation, dilation and tortuosity of the trapezius plexus of the spermatic vein. Prevalence: The prevalence of varicocele in the general population ranges from 4.4% to 22.6%, mostly in young adults aged 20-30 years, but relatively less in adolescents. According to foreign literature, the prevalence of varicocele in adolescents is about 1%~16.2%; domestic literature reports that the prevalence of varicocele in adolescents is 8.5%~19.8%, and some people have calculated that the prevalence is 5.73% in 7-10 years old, 16.53% in 11-14 years old, 20.61% in 15-18 years old, and 27.33% in 19-22 years old. The incidence of varicocele occurs on the left side in 85%-90% and on both sides in 40% of cases, while the right side alone is very rare. The anatomical explanation of varicocele is more on the left side: 1, the left spermatic vein is 8~10 longer than the right side; 2, the left renal vein is located between the abdominal aorta and superior mesenteric artery, which can cause the pressure in the left renal vein to rise due to the compression of both, thus affecting the pressure in the spermatic vein; 3, the rate of valve dysplasia in the left spermatic vein is higher (autopsy data also show that the rate of valve deficiency in the left spermatic vein is as high as 40% in humans). The rate of valve deficiency in the left spermatic vein is higher (autopsy data also show that the rate of valve deficiency in the left spermatic vein is as high as 40% in humans, whereas it is only 3% in the right spermatic vein); 4.