Varicoceles can be seen in primary diseases, but they may also be secondary to other pathological changes. Generally, the anatomical characteristics of the venous walls within the spermatic cord make it easy for blood in the spermatic veins to have reflux problems, thereby leading to varicoceles. This is mainly because there are venous valves to prevent backflow when the veins inside the spermatic cord drain into the renal vein. If these valves are not fully developed, it can easily cause backflow, leading to varicoceles. Moreover, varicoceles occur more frequently on the left side than on the right. The left spermatic vein generally enters the left renal vein at a right angle, which also facilitates the occurrence of varicoceles. Secondary varicoceles may be caused by retroperitoneal tumors or renal tumors compressing the spermatic vein, thus leading to obstruction in spermatic vein reflux.