Varicocele is one of the most common diseases that men suffer from. It is caused by the dilatation, tortuosity and elongation of the vasculature of the spermatic cord due to the stagnation of blood flow in the spermatic cord. The stagnant blood in the varicocele and the long-term increase in testicular temperature can cause pathological and physiological changes in the testes and epididymis, which can lead to male infertility. Varicocele can also be caused by kidney tumors or other retroperitoneal tumors. Varicocele caused by compression is called symptomatic or secondary varicocele. In addition to causing discomfort in men, varicocele also has a great impact on fertility. The specific hazards are as follows: 1, affect male fertility. According to medical statistics, about two-thirds of men with varicocele have semen abnormalities, which can lead to a decrease in the number of sperm, low motility and an increase in deformed sperm, thus leading to infertility. 2. Causes local discomfort. It is manifested as swelling and pulling pain at the scrotum, which is significant when standing and moving and can be alleviated by lying in bed. It can also be accompanied by neurasthenia due to the patient’s worry and anxiety, causing mood disorders, fatigue, insomnia, etc. However, patients should note that the above mentioned discomfort only accounts for about one-third of the patients with varicocele, and most of them do not have any symptoms, so it is important to have timely examination. 3.Leading to sexual dysfunction. Some patients who suffer from varicocele, after a long time without treatment, will have low libido, decreased sexual pleasure, painful intercourse, erectile dysfunction, premature ejaculation and other sexual dysfunction. 4, affect testicular metabolism and poison sperm. Varicocele can make the testicular temperature rise about 0.6℃ on average, thus interfering with the spermatogenic ability. The stagnation of venous blood affects testicular metabolism, causing local hypoxia and accumulation of metabolic wastes, poisoning the spermatogenic cells and sperm of the testes, as well as inhibiting the production of androgen – testosterone.