The causes of varicose veins are: first, physiological reasons. The sexual function is more vigorous in young and strong, and the blood supply of scrotal contents is strong, so some varicose veins can disappear gradually with age. In addition, standing for a long time and increasing the abdominal pressure are also factors for the development. Second, anatomical factors. The internal spermatic vein is long and enters the renal vein at a right angle, the blood flow is subject to certain resistance, and the left internal spermatic vein near the left renal vein has no valve, so the blood is easy to backflow. Normally, the muscle fiber tissue in the spermatic cord envelope can produce the role of pump to promote venous reflux, when the appeal and fiber tissue is atrophied or relaxed, it is not conducive to venous reflux, resulting in varicose veins. Third, other factors. Retroperitoneal tumor, renal tumor, hydronephrosis, etc. compressing the inner spermatic vein can cause symptomatic or secondary varicocele, which can disappear quickly when the primary one is lying down, and the secondary one often does not disappear or disappears very slowly. The above content is for reference only, please refer to the doctor’s instruction for specific medication and treatment.