The probability of infertility in varicocele is inconsistently reported in the documents, which is about 15% to 40%. Varicocele refers to the abnormal stretching, dilatation, and tortuosity of the venous blood vessels in the spermatic cord, which can be categorized into primary and secondary in terms of cause, and primary varicocele is mainly common in clinical practice. Primary varicocele affects fertility. Primary varicocele leads to a decrease in sperm quality, mainly due to the expansion of the veins and the increase in local temperature, which is not conducive to the synthesis of spermatozoa. In addition, the accumulation of carbon dioxide in the testicles, as well as the increase in the concentration of cortisol and prostaglandins in the blood, will also affect the spermatogenic function of the testicles, which will lead to a decrease in the quality of semen, and severe infertility. If you have varicocele, you should go to the regular hospital for examination and treatment as prescribed by the doctor.